Integrated Taxonomic Information System - Taxon Author Search Results

Publication: Turgeon, D. D., A. E. Bogan, E. V. Coan, W. K. Emerson, W. G. Lyons, W. Pratt, et al. 1988 Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks American Fisheries Society Special Publication 16 vii + 277

ITIS records citing this publication
 
 Kingdom Animalia
  Abra aequalis (Say, 1822) -- valid -- Atlantic abra
  Abra lioica (Dall, 1881) -- valid -- smooth abra
  Abra longicallis americana A. E. Verrill and Bush, 1898 -- valid -- long abra
  Acanthina lugubris (G. B. Sowerby I, 1821) -- valid -- dark unicorn
  Acanthina paucilirata (Stearns, 1871) -- valid -- checkered unicorn
  Acanthina punctulata (G. B. Sowerby I, 1825) -- valid -- spotted unicorn
  Acanthina spirata (de Blainville, 1832) -- valid -- angular unicorn
  Acanthochitona balesae Abbott, 1954 -- valid -- slender glass-hair chiton
  Acanthochitona hemphilli (Pilsbry, 1893) -- valid -- red glass-hair chiton
  Acanthochitona pygmaea (Pilsbry, 1893) -- valid -- striate glass-hair chiton
  Acanthodoris brunnea MacFarland, 1905 -- valid -- brown spiny doris
  Acanthodoris lutea MacFarland, 1925 -- valid -- orange-peel doris
  Acanthodoris nanaimoensis O'Donoghue, 1921 -- valid -- wine-plumed spiny doris
  Acanthodoris pilosa (Abildgaard, 1789) -- valid -- hairy spiny doris
  Acanthodoris rhodoceras Cockerell, 1905 -- valid -- black-tipped spiny doris
  Acanthopleura granulata (Gmelin, 1791) -- valid -- West Indian fuzzy chiton
  Acanthotrophon striatoides Vokes, 1980 -- valid -- knobbed trophon
  Acella haldemani (W. G. Binney, 1867) -- valid -- spindle lymnaea
  Achatina fulica (Ferussac, 1821) -- valid -- giant african snail
  Acila castrensis (Hinds, 1843) -- valid -- divaricate nutclam
  Acirsa borealis (Lyell, 1841) -- valid -- chalky wentletrap
  Aclis carolinensis Bartsch, 1911 -- valid -- Carolina aclis
  Aclis lata Dall, 1889 -- valid -- wide aclis
  Aclis occidentalis (Hemphill, 1894) -- valid -- Pacific aclis
  Aclis striata A. E. Verrill, 1880 -- valid -- striate aclis
  Aclis tenuis A. E. Verrill, 1882 -- valid -- thin aclis
  Aclis turrita (Carpenter, 1864) -- valid -- turreted aclis
  Aclistothyra atlantica McGinty, 1955 -- valid -- Atlantic galeommatid
  Acmaea funiculata (Carpenter, 1864) -- valid -- corded white limpet
  Acmaea mitra Eschscholtz, 1833 -- valid -- whitecap limpet
  Acroloxus coloradensis (J. Henderson, 1930) -- valid -- Rocky Mountain capshell
  Acteocina atrata P. S. Mikkelsen and P. M. Mikkelsen, 1984 -- valid -- blackback barrel-bubble
  Acteocina bidentata (d'Orbigny, 1841) -- valid -- two-tooth barrel-bubble
  Acteocina bullata (Kiener, 1834) -- valid -- striate barrel-bubble
  Acteocina canaliculata (Say, 1826) -- valid -- channeled barrel-bubble
  Acteocina cerealis (Gould, 1853) -- valid -- grain barrel-bubble
  Acteocina culcitella (Gould, 1853) -- valid -- pillow barrel-bubble
  Acteocina eburnea A. E. Verrill, 1885 -- valid -- ivory barrel-bubble
  Acteocina inculta (Gould, 1855) -- valid -- rude barrel-bubble
  Acteocina intermedia Willett, 1928 -- valid -- intermediate barrel-bubble
  Acteocina oryza (Totten, 1835) -- valid -- rice barrel-bubble
  Acteocina recta (d'Orbigny, 1841) -- valid -- straight barrel-bubble
  Actinonaias ligamentina (Lamarck, 1819) -- invalid -- mucket
  Actinonaias pectorosa (Conrad, 1834) -- invalid -- pheasantshell
  Adalaria proxima (Alder and Hancock, 1854) -- valid -- false doris, yellow false doris
  Admete californica (Dall, 1908) -- valid -- California admete
  Admete couthouyi (Jay, 1839) -- valid -- northern admete
  Admete gracilior (Carpenter, 1869) -- valid -- slender admete
  Admete regina Dall, 1911 -- valid -- noble admete
  Adontorhina cyclia S. S. Berry, 1947 -- valid -- circle axinopsid
  Adontorhina sphaericosa Scott, 1986 -- valid -- inflated axinopsid
  Adrana notabilis Rehder, 1939 -- valid -- notable nutclam
  Adrana scaphoides Rehder, 1939 -- valid -- skiff nutclam
  Adrana tellinoides (Sowerby, 1823) -- valid -- tellinoid nutclam
  Adula californiensis (Philippi, 1847) -- valid -- California datemussel
  Adula diegensis (Dall, 1911) -- valid -- San Diego datemussel
  Adula falcata (Gould, 1851) -- valid -- curved datemussel
  Aegires albopunctatus MacFarland, 1905 -- valid -- salt-and-pepper doris
  Aeolidia papillosa (Linnaeus, 1761) -- valid -- shag-rug aeolis
  Aeolidiella takanosimensis Baba, 1930 -- valid -- vermillion japanese aeolis
  Aequipecten glyptus (A. E. Verrill, 1882) -- valid -- red-ribbed scallop
  Aequipecten lineolaris (Lamarck, 1819) -- valid -- lined scallop
  Aesopus chrysalloideus (Carpenter, 1864) -- valid -- cocoon dovesnail
  Aesopus myrmecoon Dall, 1916 -- valid -- ant-egg dovesnail
  Aesopus sanctus Dall, 1919 -- valid -- Santa Monica dovesnail
  Aesopus subturritus (Carpenter, 1864) -- valid -- graceful dovesnail
  Aforia circinata (Dall, 1873) -- valid -- keeled aforia
  Aglaja ocelligera (Bergh, 1893) -- valid -- eyespot aglaja
  Agriopoma texasianum (Dall, 1892) -- valid -- texas venus
  Alaba incerta (d'Orbigny, 1842) -- valid -- varicose cerith
  Alasmidonta arcula (Lea, 1838) -- valid -- Altamaha arcmussel
  Alasmidonta atropurpurea (Rafinesque, 1831) -- valid -- Cumberland elktoe
  Alasmidonta heterodon (Lea, 1829) -- invalid -- dwarf wedge mussel, dwarf wedgemussel
  Alasmidonta marginata Say, 1818 -- valid -- elktoe
  Alasmidonta mccordi Athearn, 1964 -- valid -- Coosa elktoe
  Alasmidonta raveneliana (Lea, 1834) -- valid -- Appalachian elktoe
  Alasmidonta robusta Clarke, 1981 -- valid -- Carolina elktoe
  Alasmidonta undulata (Say, 1817) -- valid -- triangle floater
  Alasmidonta varicosa (Lamarck, 1819) -- valid -- brook floater
  Alasmidonta viridis (Rafinesque, 1820) -- invalid -- slippershell mussel
  Alasmidonta wrightiana (Walker, 1901) -- valid -- Ochlockonee arcmussel
  Alcadia striata (Lamarck, 1822) -- valid -- striate drop
  Alderia modesta (Loven, 1844) -- valid -- modest alderia
  Aldisa sanguinea (J. G. Cooper, 1863) -- valid -- blood-spot doris
  Alexania floridana (Pilsbry, 1945) -- valid -- smooth wentletrap
  Aligena diegoana Hertlein and Grant, 1972 -- valid -- san diego aligena
  Aligena elevata (Stimpson, 1851) -- valid -- eastern aligena
  Aligena texasiana Harry, 1969 -- valid -- Texas aligena
  Allogona lombardii A. G. Smith, 1943 -- valid -- Selway forestsnail
  Allogona profunda (Say, 1821) -- valid -- broad-banded forestsnail
  Allogona ptychophora (A. D. Brown, 1870) -- valid -- Idaho forestsnail
  Allogona townsendiana (I. Lea, 1838) -- valid -- Oregon forestsnail
  Alvania auberiana (d'Orbigny, 1842) -- valid -- West Indian alvania, West Indian alvania
  Alvania microglypta Haas, 1943 -- valid -- fine-cut alvania
  Alvania rosana Bartsch, 1911 -- valid -- Santa Rosa alvania
  Alvania xanthias (Watson, 1886) -- valid -- sharp-rib alvania
  Amaea retifera (Dall, 1889) -- valid -- reticulate wentletrap
  Amauropsis islandica (Gmelin, 1791) -- valid -- Iceland moonsnail
  Amblema neislerii (Lea, 1858) -- valid -- fat three-ridge, fat threeridge
  Americardia biangulata (Broderip and G. B. Sowerby I, 1829) -- valid -- western strawberry cockle, western strawberry-cockle
  Americardia guppyi (Thiele, 1910) -- valid -- guppy strawberry cockle, Guppy strawberry-cockle
  Americardia media (Linnaeus, 1758) -- valid -- atlantic strawberry cockle, Atlantic strawberry-cockle
  Amiantis callosa (Conrad, 1837) -- valid -- white venus
  Ammonitella yatesii (J. G. Cooper, 1968) -- valid -- tight coin
  Amnicola aldrichi (Call and Beecher, 1886) -- invalid -- Hoosier Amnicola
  Amnicola browni Carpenter, 1872 -- invalid -- Slender Duskysnail
  Amnicola cora Hubricht, 1979 -- valid -- Foushee Cavesnail
  Amnicola dalli (Pilsbry and Beecher, 1892) -- valid -- Peninsula Amnicola
  Amnicola granum (Say, 1822) -- invalid -- Squat Duskysnail
  Amnicola greggi (Pilsbry, 1935) -- invalid -- Rocky Mountain Duskysnail
  Amnicola limosus (Say, 1817) -- valid -- Mud Amnicola
  Amnicola missouriensis Pilsbry, 1898 -- invalid -- Missouri Amnicola
  Amnicola pilsbry Walker, 1906 -- invalid -- Lake Duskysnail
  Amnicola proserpina Hubricht, 1940 -- invalid -- proserpine cavesnail
  Amnicola pupoideus (Gould, 1841) -- invalid -- Pupa Duskysnail
  Amnicola retromargo F. G. Thompson, 1968 -- invalid -- Indented Duskysnail
  Amnicola rhombostoma F. G. Thompson, 1968 -- valid -- Squaremouth Amnicola
  Amnicola stygius Hubricht, 1971 -- valid -- Stygian Amnicola
  Amnicola walkeri Pilsbry, 1898 -- invalid -- Canadian Duskysnail
  Amphigyra alabamensis Pilsbry, 1906 -- valid -- Shoal Sprite
  Amphissa bicolor Dall, 1892 -- valid -- two-tone amphissa
  Amphissa columbiana Dall, 1916 -- valid -- wrinkled amphissa
  Amphissa cymata Dall, 1916 -- valid -- wavy amphissa
  Amphissa haliaeeti (Jeffreys, 1867) -- valid -- atlantic amphissa
  Amphissa reticulata Dall, 1916 -- valid -- reticulate amphissa
  Amphissa versicolor Dall, 1871 -- valid -- variegate amphissa
  Amusium papyraceum (Gabb, 1873) -- valid -- paper scallop
  Amygdalum pallidulum (Dall, 1916) -- valid -- pallid papermussel
  Amygdalum papyrium (Conrad, 1846) -- valid -- Atlantic papermussel
  Amygdalum sagittatum Rehder, 1934 -- valid -- arrow papermussel
  Anachis avara (Say, 1822) -- valid -- greedy dovesnail
  Anachis catenata (Sowerby, 1844) -- valid -- chain dovesnail
  Anachis floridana Rehder, 1939 -- valid -- florida dovesnail
  Anachis iontha (Ravenel, 1861) -- valid -- lineate dovesnail
  Anachis lafresnayi (P. Fischer and Bernardi, 1856) -- valid -- well-ribbed dovesnail
  Anachis obesa C. B. Adams, 1845 -- valid -- fat dovesnail
  Anachis pulchella (de Blainville, 1829) -- valid -- beautiful dovesnail
  Anachis semiplicata Stearns, 1873 -- valid -- gulf dovesnail
  Anachis sparsa (Reeve, 1859) -- valid -- sparse dovesnail
  Anadara baughmani Hertlein, 1951 -- valid -- baughman ark, skewed ark
  Anadara brasiliana (Lamarck, 1819) -- valid -- incongruous ark
  Anadara chemnitzii (Philippi, 1851) -- valid -- chemnitz ark, triangular ark
  Anadara floridana (Conrad, 1869) -- valid -- cut-ribbed ark
  Anadara multicostata (G. B. Sowerby I, 1833) -- valid -- many-ribbed ark
  Anadara notabilis (Roding, 1798) -- valid -- eared ark
  Anadara ovalis (Bruguiere, 1789) -- valid -- blood ark
  Anadara transversa (Say, 1822) -- valid -- transverse ark
  Anadenulus cockerelli (Hemphill, 1890) -- valid -- American keeled slug
  Anatina anatina (Spengler, 1802) -- valid -- smooth duckclam
  Anatoma crispata (Fleming, 1828) -- valid -- crispate scissurelle
  Ancistrobasis depressa (Dall, 1889) -- valid -- depressed basilissa
  Ancula gibbosa (Risso, 1818) -- valid -- Atlantic ancula
  Ancula lentiginosa Farmer, 1964 -- valid -- freckled ancula
  Ancula pacifica MacFarland, 1905 -- valid -- Pacific ancula
  Anguispira alabama (G. H. Clapp, 1920) -- valid -- alabama disc, Alabama tigersnail
  Anguispira alternata (Say, 1816) -- valid -- flamed disc, flamed tigersnail
  Anguispira cumberlandiana (I. Lea, 1840) -- valid -- cumberland disc, Cumberland tigersnail
  Anguispira fergusoni (Bland, 1861) -- valid -- coastal plains disc, coastal-plain tigersnail
  Anguispira jessica Kutchka, 1938 -- valid -- mountain disc, mountain tigersnail
  Anguispira knoxensis (Pilsbry, 1899) -- valid -- rustic disc, rustic tigersnail
  Anguispira kochi (Pfeiffer, 1821) -- valid -- banded globe, banded tigersnail
  Anguispira mordax (Shuttleworth, 1852) -- valid -- appalachian disc, Appalachian tigersnail
  Anguispira nimapuna H. B. Baker, 1932 -- valid -- nimapuna disc, Nimapu tigersnail
  Anguispira picta (G. H. Clapp, 1920) -- valid -- painted disc, painted snake coiled forest snail, painted tigersnail
  Anguispira rugoderma Hubricht, 1938 -- valid -- pine mountain disc, Pine Mountain tigersnail
  Anguispira strongyloides (Pfeiffer, 1854) -- valid -- southeastern disc, southeastern tigersnail
  Angustipes ameghini (Gambetta, 1923) -- valid -- black-velvet leatherleaf
  Anisodoris lentiginosa Millen, 1982 -- valid -- mottled pale sea-lemon
  Anodonta beringiana Middendorff, 1851 -- invalid -- Yukon floater
  Anodonta californiensis Lea, 1852 -- valid -- California floater
  Anodonta cataracta marginata Say, 1817 -- invalid -- Gaspe floater
  Anodonta couperiana Lea, 1840 -- invalid -- barrel floater
  Anodonta gibbosa Say, 1824 -- invalid -- inflated floater
  Anodonta grandis Say, 1829 -- invalid -- giant floater
  Anodonta imbecillis Say, 1829 -- invalid -- paper pondshell
  Anodonta implicata Say, 1829 -- invalid -- alewife floater
  Anodonta kennerlyi Lea, 1860 -- valid -- western floater
  Anodonta nuttalliana Lea, 1838 -- valid -- winged floater
  Anodonta oregonensis Lea, 1838 -- valid -- Oregon floater
  Anodonta suborbiculata Say, 1831 -- invalid -- flat floater
  Anodontia alba Link, 1807 -- valid -- buttercup lucine
  Anodontia philippiana (Reeve, 1850) -- valid -- chalky buttercup lucine
  Anodontoides ferussacianus (Lea, 1834) -- valid -- cylindrical papershell
  Anodontoides radiatus (Conrad, 1834) -- invalid -- rayed creekshell
  Anomalocardia auberiana (d'Orbigny, 1842) -- valid -- pointed venus
  Anomalocardia brasiliana (Gmelin, 1791) -- valid -- Carib pointed-venus
  Anomia peruviana d'Orbigny, 1846 -- valid -- Peruvian jingle
  Anomia simplex D'Orbigny, 1842 -- valid -- common jingle
  Anomia squamula Linnaeus, 1758 -- valid -- prickly jingle
  Antalis antillarum (d'Orbigny, 1842) -- valid -- Antillean tuskshell
  Antalis berryi (A. G. Smith and M. Gordon, 1948) -- valid -- berry tuskshell
  Antalis ceratum (Dall, 1881) -- valid -- waxy tuskshell
  Antalis circumcinctum (Watson, 1879) -- valid -- banded tuskshell
  Antalis entale occidentale (Stimpson, 1851) -- valid -- occidental tuskshell
  Antalis pilsbryi (Rehder, 1942) -- valid -- pilsbry tuskshell
  Antalis pretiosum (G. B. Sowerby II, 1860) -- valid -- wampum tuskshell
  Antalis taphrium (Dall, 1889) -- valid -- green tuskshell
  Anticlimax pilsbryi (McGinty, 1945) -- valid -- cupola vitrinella
  Antrobia culveri Hubricht, 1971 -- valid -- Tumbling Creek Cavesnail
  Antroselatus spiralis Hubricht, 1963 -- invalid -- Shaggy Cavesnail
  Aphaostracon asthenes F. G. Thompson, 1968 -- valid -- Blue Spring Hydrobe
  Aphaostracon chalarogyrus F. G. Thompson, 1968 -- valid -- Freemouth Hydrobe
  Aphaostracon hypohyalinum F. G. Thompson, 1968 -- valid -- Suwanee Hydrobe
  Aphaostracon monas (Pilsbry, 1899) -- valid -- Wekiwa Hydrobe
  Aphaostracon pachynotum F. G. Thompson, 1968 -- valid -- Thick-shell Hydrobe, Thick-shelled Hydrobe
  Aphaostracon pycnum F. G. Thompson, 1968 -- invalid -- dense hydrobe
  Aphaostracon rhadinum F. G. Thompson, 1968 -- valid -- Slough Hydrobe
  Aphaostracon theiocrenetum F. G. Thompson, 1968 -- valid -- Clifton Spring Hydrobe
  Aphaostracon xynoelictum F. G. Thompson, 1968 -- valid -- Fenney Spring Hydrobe
  Aplexa elongata (Say, 1821) -- valid -- Lance Aplexa
  Aplysia brasiliana Rang, 1828 -- valid -- sooty seahare, mottled seahare
  Aplysia californica J. G. Cooper, 1863 -- valid -- California seahare
  Aplysia dactylomela Rang, 1828 -- valid -- spotted seahare
  Aplysia juliana Quoy and Gaimard, 1832 -- valid -- walking seahare
  Aplysia morio (A. E. Verrill, 1901) -- valid -- atlantic black seahare, sooty seahare
  Aplysia reticulopoda Beeman, 1960 -- valid -- net-foot seahare
  Aplysia vaccaria Winkler, 1955 -- valid -- California black seahare
  Apodopsis Pilsbry and McGinty, 1949 -- invalid
  Apodopsis novimundi Pilsbry and McGinty, 1949 -- invalid
  Aporrhais occidentalis Beck, 1836 -- valid -- American pelicanfoot
  Arca imbricata Bruguiere, 1789 -- valid -- mossy ark
  Arca zebra (Swainson, 1833) -- valid -- turkey wing
  Archidoris montereyensis (J. G. Cooper, 1863) -- valid -- Monterey sea-lemon
  Archidoris odhneri (MacFarland, 1966) -- valid -- white night doris
  Architectonica nobilis Roding, 1798 -- valid -- common sundial
  Arcidens confragosus (Say, 1829) -- valid -- rock pocketbook
  Arcinella arcinella (Linnaeus, 1767) -- valid -- spiny jewelbox
  Arcinella cornuta Conrad, 1866 -- valid -- Florida spiny jewelbox
  Arcopsis adamsi (Dall, 1886) -- valid -- adams ark, cancellate ark
  Arctica islandica (Linnaeus, 1767) -- valid -- ocean quahog
  Arctomelon stearnsii (Dall, 1872) -- valid -- Alaska volute
  Arene bairdii (Dall, 1889) -- valid -- warty cyclostreme
  Arene briareus (Dall, 1881) -- valid -- briar cyclostreme
  Arene cruentata (Megerle von Muhlfeld, 1829) -- valid -- star cyclostreme
  Arene farallonensis (A. G. Smith, 1952) -- valid -- farallon cyclostreme
  Arene tricarinata (Stearns, 1872) -- valid -- gem cyclostreme
  Arene variabilis (Dall, 1889) -- valid -- variable cyclostreme
  Arene venustula Aguayo and Rehder, 1936 -- valid -- graceful cyclostreme
  Argonauta argo Linnaeus, 1758 -- valid -- greater argonaut
  Argonauta hians Lightfoot, 1786 -- valid -- winged argonaut
  Argonauta nodosa Lightfoot, 1786 -- valid -- knobby argonaut
  Argopecten gibbus (Linnaeus, 1758) -- valid -- Atlantic calico scallop
  Argopecten irradians (Lamarck, 1819) -- valid -- bay scallop
  Argopecten nucleus (Born, 1778) -- valid -- nucleus scallop
  Ariolimax californicus J. G. Cooper, 1872 -- valid -- california banana slug, California bananaslug
  Ariolimax columbianus (Gould, 1851) -- valid -- pacific banana slug, Pacific bananaslug
  Ariolimax dolichophallus Mead, 1943 -- valid -- slender banana slug, slender bananaslug
  Arion ater (Linnaeus, 1758) -- valid -- black arion
  Arion circumscriptus Johnston, 1828 -- valid -- brown-banded arion
  Arion distinctus Mabille, 1868 -- valid -- darkface arion
  Arion fasciatus (Nilsson, 1823) -- valid -- orange-banded arion
  Arion hortensis Ferussac, 1819 -- valid -- garden arion
  Arion intermedius (Normand, 1852) -- valid -- hedgehog arion
  Arion owenii Davies, 1979 -- valid -- warty arion
  Arion rufus (Linnaeus, 1758) -- valid -- chocolate arion
  Arion subfuscus (Draparnaud, 1805) -- valid -- dusky arion
  Arkansia wheeleri Ortmann & Walker, 1912 -- invalid -- Wheeler's pearly mussel, Ouachita rock pocketbook
  Armina californica (J. G. Cooper, 1863) -- valid -- California armina
  Asaphis deflorata (Linnaeus, 1758) -- valid -- gaudy sanguin
  Ashmunella amblya Pilsbry, 1940 -- valid -- Pine Springs woodlandsnail
  Ashmunella angulata Pilsbry, 1905 -- valid -- angulate woodlandsnail
  Ashmunella animasensis Vagvolgyi, 1974 -- valid -- Animas Peak woodlandsnail
  Ashmunella ashmuni (Dall, 1897) -- valid -- Jemez woodlandsnail
  Ashmunella auriculata Vagvolgyi, 1974 -- valid -- Boulder Canyon woodlandsnail
  Ashmunella bequaerti Clench and W. B. Miller, 1966 -- valid -- Goat Cave woodlandsnail
  Ashmunella binneyi Pilsbry and Ferriss, 1917 -- valid -- Silver Creek woodlandsnail
  Ashmunella carlsbadensis Pilsbry, 1932 -- valid -- Guadalupe woodlandsnail
  Ashmunella chiricahuana (Dall, 1896) -- valid -- Cave Creek woodlandsnail
  Ashmunella cockerelli Pilsbry and Ferriss, 1917 -- valid -- Black Range woodlandsnail
  Ashmunella danielsi Pilsbry and Ferriss, 1915 -- valid -- Whitewater Creek woodlandsnail
  Ashmunella esuritor Pilsbry, 1915 -- valid -- barefoot woodlandsnail
  Ashmunella ferrissi Pilsbry, 1905 -- valid -- Reed's Mountain woodlandsnail
  Ashmunella harrisi Metcalf and Smartt, 1977 -- valid -- Goat Mountain woodlandsnail
  Ashmunella hebardi Pilsbry and Vanatta, 1923 -- valid -- Hacheta Grande woodlandsnail
  Ashmunella kochii G. H. Clapp, 1908 -- valid -- san andreas woodlandsnail
  Ashmunella lepiderma Pilsbry and Ferriss, 1910 -- valid -- Whitetail woodlandsnail
  Ashmunella levettei (Bland, 1881) -- valid -- Huachuca woodlandsnail
  Ashmunella macromphala Vagvolgyi, 1974 -- valid -- Cook's Peak woodlandsnail
  Ashmunella mearnsii (Dall, 1895) -- valid -- big hatchet woodlandsnail
  Ashmunella mendax Pilsbry and Ferriss, 1917 -- valid -- Iron Creek woodlandsnail
  Ashmunella mogollonensis Pilsbry, 1905 -- valid -- Mogollon woodlandsnail
  Ashmunella mudgei Cheatum, 1971 -- valid -- Sawtooth Mountain woodlandsnail
  Ashmunella organensis Pilsbry, 1936 -- valid -- Organ Mountain woodlandsnail
  Ashmunella pasonis (Drake, 1951) -- valid -- Franklin Mountain woodlandsnail
  Ashmunella pilsbryana Ferriss, 1914 -- valid -- Blue Mountain woodlandsnail
  Ashmunella proxima Pilsbry, 1905 -- valid -- Chiricahua woodlandsnail
  Ashmunella pseudodonta (Dall, 1897) -- valid -- Capitan woodlandsnail
  Ashmunella rhyssa (Dall, 1897) -- valid -- Sierra Blanca woodlandsnail
  Ashmunella rileyensis Metcalf and Hurley, 1971 -- valid -- Mount Riley woodlandsnail
  Ashmunella salinasensis Vagvolgyi, 1974 -- valid -- Salinas Peak woodlandsnail
  Ashmunella sprouli R. W. Fullington and K. E. Fullington, 1978 -- valid -- Hell's Canyon woodlandsnail
  Ashmunella tetrodon Pilsbry and Ferriss, 1915 -- valid -- Dry Creek woodlandsnail
  Ashmunella thomsoniana (Ancey, 1887) -- valid -- sangre de cristo woodlandsnail
  Ashmunella todseni Metcalf and Smartt, 1977 -- valid -- Maple Canyon woodlandsnail
  Ashmunella varicifera Ancey, 1901 -- valid -- Miller Canyon woodlandsnail
  Ashmunella walkeri Ferriss, 1904 -- valid -- Florida Mountain woodlandsnail
  Aspella senex Dall, 1903 -- valid -- graybeard aspella
  Asperiscala bellastriata (Carpenter, 1864) -- valid -- well-threaded wentletrap
  Assiminea californica (Tryon, 1865) -- valid -- California assiminea
  Assiminea infima S. S. Berry, 1947 -- valid -- Badwater Snail
  Assiminea succinea (Pfeiffer, 1840) -- valid -- Atlantic assiminea
  Astarte castanea (Say, 1822) -- valid -- smooth astarte
  Astarte compacta Carpenter, 1864 -- valid -- compact astarte
  Astarte crenata (J. E. Gray, 1824) -- valid -- crenulate astarte
  Astarte esquimalti (Baird, 1863) -- valid -- eskimo astarte, wavy-line astarte
  Astarte mirabilis (Dall, 1871) -- valid -- strange astarte
  Astarte nana Dall, 1886 -- valid -- dwarf astarte
  Astarte polaris Dall, 1903 -- valid -- polar astarte
  Astarte quadrans Gould, 1841 -- valid -- squarish astarte
  Astarte smithii Dall, 1886 -- valid -- smith astarte
  Astarte undata Gould, 1841 -- valid -- wavy astarte
  Astarte willetti Dall, 1917 -- valid -- willett astarte
  Asthenothaerus hemphilli Dall, 1886 -- valid -- hemphill thracid, square thraciid
  Asthenothaerus villosior Carpenter, 1864 -- valid -- hairy thracid
  Astralium phoebium (Röding, 1798) -- valid -- longspine starsnail
  Astyris rosacea (Gould, 1839) -- valid -- rosy northern dovesnail
  Atagema alba (O'Donoghue, 1927) -- valid -- hunchback doris
  Atrina oldroydii Dall, 1901 -- valid -- Oldroyd penshell
  Atrina rigida (Lightfoot, 1786) -- valid -- stiff penshell
  Atrina seminuda (Lamarck, 1819) -- valid -- half-naked penshell
  Atrina serrata (G. B. Sowerby I, 1825) -- valid -- sawtooth penshell
  Atys caribaeus (d'Orbigny, 1841) -- valid -- Caribbean glassy-bubble
  Atys castus Carpenter, 1864 -- valid -- clean glassy-bubble
  Atys nonscriptus (A. Adams, 1850) -- valid -- clean-slate glassy-bubble
  Atys obscuratus Dall, 1896 -- valid -- obscure glassy-bubble
  Axinopsida cordata (A. E. Verrill and Bush, 1898) -- valid -- heart-shaped axinopsid, heart axinopsid
  Axinopsida orbiculata (G. O. Sars, 1878) -- valid -- orbicular axinopsid
  Axinopsida serricata (Carpenter, 1864) -- valid -- silky axinopsid, lenticular axinopsid
  Axinopsida viridis (Dall, 1901) -- valid -- green axinopsid
  Axinulus careyi Bernard, 1979 -- valid -- carey axinopsid
  Axinulus redondoensis (T. A. Burch, 1941) -- valid -- redondo axinopsid
  Babakina festiva (Roller, 1972) -- valid -- single-stalk aeolis
  Bailya intricata (Dall, 1884) -- valid -- intricate phos
  Bankia carinata (J. E. Gray, 1827) -- valid -- carinate shipworm
  Bankia fimbriatula Moll and Roch, 1931 -- valid -- fimbriate shipworm
  Bankia gouldi (Bartsch, 1908) -- valid -- gould shipworm, cupped shipworm
  Bankia setacea (Tryon, 1863) -- valid -- feathery shipworm
  Barbatia cancellaria (Lamarck, 1819) -- valid -- red-brown ark
  Barbatia candida (Helbling, 1779) -- valid -- white-beard ark
  Barbatia domingensis (Lamarck, 1819) -- valid -- white miniature ark
  Barbatia tenera (C. B. Adams, 1845) -- valid -- doc bales ark, delicate ark
  Barleeia acuta -- valid -- acute barleysnail
  Barleeia californica Bartsch, 1920 -- valid -- california barleysnail
  Barleeia haliotiphila Carpenter, 1864 -- valid -- abalone barleysnail
  Barleeia subtenuis Carpenter, 1864 -- valid -- fragile barleysnail
  Barleeia tincta Guppy, 1895 -- valid -- Caribbean barleysnail
  Barnea subtruncata (G. B. Sowerby I, 1834) -- valid -- pacific mud piddock, Pacific mud-piddock
  Barnea truncata (Say, 1822) -- valid -- atlantic mud piddock, Atlantic mud-piddock
  Basiliomya goreaui Bayer, 1971 -- valid -- goreau dimyid
  Basterotia corbuloidea Dall, 1899 -- valid -- corbula sportella
  Basterotia elliptica (Recluz, 1850) -- valid -- elliptical sportella
  Basterotia quadrata (Hanley, 1843) -- valid -- square sportella
  Bathyarca anomala (A. E. Verrill and Bush, 1898) -- valid -- anomalous bathyark
  Bathyarca frielei (Friele, 1877) -- valid -- friele bathyark, boreal bathyark
  Bathyarca glacialis (J. E. Gray, 1824) -- valid -- glacial bathyark
  Bathyarca glomerula (Dall, 1881) -- valid -- little-ball bathyark
  Bathyarca pectunculoides (Scacchi, 1833) -- valid -- comb bathyark
  Bathypolypus arcticus (Prosch, 1847) -- valid -- spoonarm octopus
  Batillaria minima (Gmelin, 1791) -- valid -- West Indian false cerith
  Batillaria zonalis (Bruguiere, 1792) -- valid -- japanese false cerith
  Benthonella nisonis Dall, 1889 -- valid -- regal benthonella
  Beringius crebricostatus (Dall, 1877) -- valid -- thick-cord whelk
  Bermudaclis tampaensis Bartsch, 1947 -- valid -- tampa aclis
  Bernardina bakeri Dall, 1910 -- valid -- baker bernard-clam, Baker bernardclam
  Berryteuthis magister (Berry, 1913) -- valid -- magister armhook squid
  Berthelinia caribbea Edmunds, 1963 -- valid -- Caribbean bivalved snail
  Berthella californica (Dall, 1900) -- valid -- California sidegill slug
  Binneya guadalupensis Pilsbry, 1927 -- valid -- guadalupe shelled slug
  Binneya notabilis J. G. Cooper, 1863 -- valid -- santa barbara shelled slug, Santa Barbara shelledslug
  Biomphalaria glabrata (Say, 1818) -- valid -- bloodfluke planorb
  Biomphalaria havanensis (Pfeiffer, 1839) -- valid -- Ghost Ramshorn
  Birgella subglobosus (Say, 1825) -- valid -- Globe Siltsnail
  Bithynia tentaculata (Linnaeus, 1758) -- valid -- mud bithynia
  Bittium attenuatum Carpenter, 1864 -- valid -- slender cerith
  Bittium eschrichtii (Middendorf, 1849) -- valid -- threaded cerith
  Bittium quadrifilatum Carpenter, 1864 -- valid -- four-thread cerith
  Bittium varium (Pfeiffer, 1840) -- valid -- grass cerith
  Blauneria heteroclita (Montagu, 1808) -- valid -- left-handed melampus, left-hand melampus
  Boonea bisuturalis (Say, 1822) -- valid -- two-groove odostome
  Boonea impressa (Say, 1822) -- valid -- impressed odostome
  Boonea seminuda (C. B. Adams, 1839) -- valid -- half-smooth odostome
  Boreacola vadosus Bernard, 1979 -- valid -- arctic montacutid
  Boreoscala greenlandica (G. Perry, 1811) -- valid -- greenland wentletrap
  Boreotrophon albospinosus (Willett, 1931) -- valid -- white-spine trophon
  Boreotrophon avalonensis Dall, 1902 -- valid -- Avalon trophon
  Boreotrophon cepulus (Sowerby, 1880) -- valid -- scallion trophon
  Boreotrophon clathratus (Linnaeus, 1767) -- valid -- clathrate trophon
  Boreotrophon disparilis (Dall, 1891) -- valid -- girdled trophon
  Boreotrophon eucymatus Dall, 1902 -- valid -- grooved trophon
  Boreotrophon macouni (Dall, 1910) -- valid -- corded trophon
  Boreotrophon multicostatus (Eschscholtz, 1829) -- valid -- ribbed trophon
  Boreotrophon orpheus (Gould, 1849) -- valid -- threaded trophon
  Boreotrophon rotundatus (Dall, 1902) -- valid -- rotund trophon
  Boreotrophon staphylinus (Dall, 1919) -- valid -- carrot trophon
  Boreotrophon stuarti (E. A. Smith, 1880) -- valid -- winged trophon
  Boreotrophon triangulatus (Carpenter, 1864) -- valid -- triangular trophon
  Boreotrophon truncatus (Strom, 1768) -- valid -- bobtail trophon
  Bornia longipes (Stimpson, 1855) -- valid -- borniaclam
  Bostrychocentrum metcalfi F. G. Thompson, 1974 -- valid -- metcalf holospira
  Bothriopupa variolosa (Gould, 1848) -- valid -- pitted birddrop
  Botula fusca (Gmelin, 1791) -- valid -- cinnamon mussel
  Brachidontes adamsianus (Dunker, 1857) -- valid -- Adams mussel
  Brachidontes domingensis (Lamarck, 1819) -- valid -- Santo Domingo mussel
  Brachidontes exustus (Linnaeus, 1758) -- valid -- scorched mussel
  Brachidontes modiolus (Linnaeus, 1767) -- valid -- yellow mussel
  Bractechlamys antillarum (Recluz, 1853) -- valid -- Antillean scallop
  Bradybaena similaris (Ferussac, 1821) -- valid -- Asian trampsnail
  Buccinum abyssorum A. E. Verrill, 1884 -- valid -- shingled whelk
  Buccinum aleuticum Dall, 1895 -- valid -- Aleut whelk
  Buccinum angulosum angulosum J. E. Gray, 1838 -- valid -- angular whelk, angular whelk
  Buccinum cyaneum cyaneum Bruguiere, 1792 -- valid -- bluish whelk
  Buccinum eugrammatum Dall, 1907 -- valid -- lirate whelk
  Buccinum fringillum Dall, 1877 -- valid -- finch whelk
  Buccinum glaciale Linnaeus, 1761 -- valid -- glacial whelk
  Buccinum kadiakense Dall, 1907 -- valid -- kodiak whelk
  Buccinum micropoma Thorson, 1944 -- valid -- berry whelk
  Buccinum ochotense (Middendorff, 1848) -- valid -- Okhotsk whelk
  Buccinum oedematum Dall, 1907 -- valid -- swollen whelk, swollen whelk
  Buccinum percrassum Dall, 1883 -- valid -- crude whelk
  Buccinum picturatum Dall, 1877 -- valid -- painted whelk
  Buccinum planeticum Dall, 1919 -- valid -- wandering whelk
  Buccinum plectrum Stimpson, 1865 -- valid -- sinuous whelk
  Buccinum polaris J. E. Gray, 1839 -- valid -- polar whelk
  Buccinum scalariforme Moller, 1842 -- valid -- ladder whelk
  Buccinum sericatum Hancock, 1846 -- valid -- silky whelk
  Buccinum strigillatum fucanum Dall, 1907 -- valid -- juanmore whelk
  Buccinum totteni Stimpson, 1865 -- valid -- thin whelk
  Buccinum undatum Linnaeus, 1758 -- valid -- waved whelk
  Buccinum viridum Dall, 1889 -- valid -- turban whelk, turban whelk
  Bufonaria bufo (Bruguiere, 1792) -- valid -- chestnut frogsnail
  Bulbus fragilis (Leach, 1819) -- valid -- fragile moonsnail
  Bulimnaea megasoma (Say, 1824) -- valid -- mammoth lymnaea
  Bulimulus guadalupensis (Bruguiere, 1789) -- valid -- West Indian bulimulus
  Bulla clausa Dall, 1889 -- valid -- imperforate bubble
  Bulla gemma (A. E. Verrill, 1880) -- valid -- jewel bubble
  Bulla gouldiana Pilsbry, 1895 -- valid -- California bubble
  Bulla solida Gmelin, 1791 -- valid -- solid bubble
  Bulla striata Bruguiere, 1792 -- valid -- striate bubble
  Bullina exquisita McGinty, 1955 -- valid -- exquisite bubble
  Bursa corrugata ponderosa (Reeve, 1844) -- valid -- gaudy frogsnail
  Bursa granularis cubaniana (d'Orbigny, 1842) -- valid -- Cuba frogsnail
  Bursa grayana Dunker, 1862 -- valid -- elegant frogsnail
  Bursa ranelloides tenuisculpta (Dautzenberg and H. Fischer, 1906) -- valid -- fine-sculpted frogsnail
  Bursa rhodostoma thomae (d'Orbigny, 1842) -- valid -- St. Thomas frogsnail
  Bursatella leachii pleii Rang, 1828 -- valid -- ragged seahare
  Bushia elegans (Dall, 1886) -- valid -- elegant bushclam
  Busycon candelabrum (Lamarck, 1816) -- valid -- splendid whelk
  Busycon carica (Gmelin, 1791) -- valid -- knobbed whelk
  Busycon laeostomum Kent, 1982 -- valid -- snow whelk
  Busycon pulleyi Hollister, 1958 -- valid -- prickly whelk
  Busycon sinistrum Hollister, 1958 -- valid -- lightning whelk
  Busycotypus canaliculatus (Linnaeus, 1758) -- valid -- channeled whelk
  Busycotypus plagosus (Conrad, 1862) -- valid -- shouldered pearwhelk
  Busycotypus spiratus (Lamarck, 1816) -- valid -- pearwhelk
  Cadlina flavomaculata MacFarland, 1905 -- valid -- yellow-spot cadlina
  Cadlina laevis (Linnaeus, 1767) -- valid -- white Atlantic cadlina
  Cadlina marginata MacFarland, 1905 -- valid -- yellow-rim cadlina
  Cadlina sparsa (Odhner, 1921) -- valid -- dark-spot cadlina
  Cadulus transitorius (J. B. Henderson, 1920) -- valid -- inflated toothshell
  Caecum antillarum Carpenter, 1858 -- valid -- Antillean caecum
  Caecum californicum Dall, 1885 -- valid -- California caecum
  Caecum carolinianum Dall, 1892 -- valid -- Carolina caecum
  Caecum clava de Folin, 1867 -- valid -- club caecum
  Caecum condylum Moore, 1969 -- valid -- bone caecum
  Caecum cornucopiae (Carpenter, 1858) -- valid -- horn-of-plenty caecum
  Caecum crebricinctum Carpenter, 1864 -- valid -- many-named caecum
  Caecum cubitatum (de Folin, 1868) -- valid -- smooth caecum
  Caecum cycloferum de Folin, 1867 -- valid -- fatlip caecum
  Caecum floridanum Stimpson, 1851 -- valid -- Florida caecum
  Caecum gurgulio Carpenter, 1858 -- valid -- windpipe caecum
  Caecum heladum Olsson and Harbison, 1953 -- valid -- fine-line caecum
  Caecum imbricatum Carpenter, 1858 -- valid -- imbricate caecum
  Caecum nitidum Stimpson, 1851 -- valid -- little horn caecum
  Caecum plicatum Carpenter, 1858 -- valid -- plicate caecum
  Caecum profundicolum Bartsch, 1920 -- valid -- deepwater caecum
  Caecum pulchellum Stimpson, 1851 -- valid -- beautiful caecum
  Caecum ryssotitum de Folin, 1867 -- valid -- minute caecum
  Caecum textile de Folin, 1867 -- valid -- textile caecum
  Caecum tortile Dall, 1892 -- valid -- twisted caecum
  Caecum vestitum de Folin, 1868 -- valid -- Vera Cruz caecum
  Calliostoma adelae Schwengel, 1951 -- valid -- Keys topsnail
  Calliostoma annulatum (Lightfoot, 1786) -- valid -- purple-ring topsnail
  Calliostoma canaliculatum (Lightfoot, 1786) -- valid -- channeled topsnail
  Calliostoma euglyptum (A. Adams, 1855) -- valid -- sculptured topsnail
  Calliostoma fascinans Schwengel and McGinty, 1942 -- valid -- enchanting topsnail
  Calliostoma gemmulatum Carpenter, 1864 -- valid -- gem topsnail
  Calliostoma gloriosum Dall, 1871 -- valid -- glorious topsnail
  Calliostoma javanicum (Lamarck, 1822) -- valid -- chocolate-line topsnail
  Calliostoma jujubinum (Gmelin, 1791) -- valid -- mottled topsnail
  Calliostoma ligatum (Gould, 1849) -- valid -- blue topsnail
  Calliostoma marionae Dall, 1906 -- valid -- mahogany topsnail
  Calliostoma occidentale (Mighels and C. B. Adams, 1842) -- valid -- boreal topsnail
  Calliostoma platinum Dall, 1890 -- valid -- silvery topsnail
  Calliostoma psyche Dall, 1889 -- valid -- psyche topsnail
  Calliostoma pulchrum (C. B. Adams, 1850) -- valid -- beautiful topsnail
  Calliostoma roseolum Dall, 1881 -- valid -- rosy topsnail
  Calliostoma splendens Carpenter, 1864 -- valid -- splendid topsnail
  Calliostoma supragranosum Carpenter, 1864 -- valid -- granulose topsnail
  Calliostoma tricolor Gabb, 1865 -- valid -- tricolor topsnail
  Calliostoma turbinum Dall, 1896 -- valid -- spindle topsnail
  Calliostoma variegatum Carpenter, 1864 -- valid -- variegate topsnail
  Calliostoma yucatecanum Dall, 1881 -- valid -- depressed topsnail
  Calliotropis carlotta (Dall, 1889) -- valid -- charlotte island spiny margarite
  Calliotropis regalis (A. E. Verrill and S. Smith, 1880) -- valid -- regal spiny margarite
  Callista eucymata (Dall, 1890) -- valid -- glory-of-the-seas venus
  Callistochiton portobelensis Ferreira, 1976 -- valid -- Portobelo chiton
  Callistochiton shuttleworthianus Pilsbry, 1893 -- valid -- eastern orange chiton
  Calotrophon ostrearum (Conrad, 1846) -- valid -- mauve-mouth drill
  Calyptraea centralis (Conrad, 1841) -- valid -- circular chinese hat, circular Chinese-hat
  Calyptraea fastigiata Gould, 1846 -- valid -- pacific chinese hat, Pacific Chinese-hat
  Campeloma crassulum Rafinesque, 1819 -- valid -- Ponderous Campeloma
  Campeloma decampi (W. G. Binney, 1865) -- valid -- Slender Campeloma
  Campeloma decisum (Say, 1817) -- valid -- Pointed Campeloma
  Campeloma floridense Call, 1886 -- valid -- Purple-throat Campeloma, Purple-throated Campeloma
  Campeloma geniculum (Conrad, 1834) -- valid -- Ovate Campeloma
  Campeloma limum (Anthony, 1860) -- valid -- File Campeloma
  Campeloma parthenum Vail, 1979 -- valid -- Maiden Campeloma
  Campeloma regulare (Lea, 1841) -- valid -- Cylinder Campeloma
  Candidula intersecta (Poiret, 1801) -- valid -- wrinkled helicellid
  Cantharus cancellarius (Conrad, 1846) -- valid -- cancellate cantharus
  Cantharus multangulus (Philippi, 1848) -- valid -- ribbed cantharus
  Capulus californicus Dall, 1900 -- valid -- California capsnail
  Capulus incurvus (Gmelin, 1791) -- valid -- incurved capsnail
  Capulus ungaricus (Linnaeus, 1767) -- valid -- fools capsnail
  Cardiapoda placenta (Lesson, 1830) -- valid -- flat cardiapod
  Cardiomya balboae (Dall, 1916) -- valid -- Balboa cardiomya
  Cardiomya californica (Dall, 1886) -- valid -- california cardiomya
  Cardiomya costata (Sowerby, 1834) -- valid -- costate cardiomya
  Cardiomya costellata (Deshayes, 1830) -- valid -- little-ribbed cardiomya
  Cardiomya glypta (Bush, 1885) -- valid -- carved cardiomya
  Cardiomya isolirata Bernard, 1969 -- valid -- lirate cardiomya
  Cardiomya oldroydi (Dall, 1924) -- valid -- oldroyd cardiomya
  Cardiomya ornatissima (d'Orbigny, 1842) -- valid -- ornate cardiomya
  Cardiomya pectinata (Carpenter, 1864) -- valid -- pectinate cardiomya
  Cardiomya perrostrata (Dall, 1881) -- valid -- rostrate cardiomya
  Cardiomya planetica (Dall, 1908) -- valid -- planet cardiomya, fine-rib cardiomya
  Cardiomya striata (Jeffreys, 1876) -- valid -- striate cardiomya
  Carditamera floridana Conrad, 1838 -- valid -- broad-ribbed carditid
  Carditopsis bernardi (Dall, 1903) -- valid -- bernard condylclam
  Carditopsis smithii (Dall, 1896) -- valid -- tiny condylclam
  Carinaria cithara Benson, 1835 -- valid -- harp carinaria
  Carinaria galea Benson, 1835 -- valid -- helmet carinaria
  Carychium clappi Hubricht, 1959 -- valid -- Appalachian thorn
  Carychium exiguum (Say, 1822) -- valid -- obese thorn
  Carychium exile Lea, 1842 -- valid -- ice thorn
  Carychium mexicanum Pilsbry, 1891 -- valid -- southern thorn
  Carychium minimum Muller, 1774 -- valid -- tiny herald snail, herald thorn
  Carychium nannodes G. H. Clapp, 1905 -- valid -- file thorn
  Carychium occidentale Pilsbry, 1891 -- valid -- western thorn
  Carychium riparium Hubricht, 1978 -- valid -- floodplain thorn
  Carychium stygium Call, 1897 -- valid -- cave thorn
  Casmaria ponderosa atlantica Clench, 1944 -- valid -- Atlantic casmaria
  Cassis flammea (Linnaeus, 1758) -- valid -- flame helmet
  Cassis madagascariensis Lamarck, 1822 -- valid -- cameo helmet
  Cassis tuberosa (Linnaeus, 1758) -- valid -- Caribbean helmet
  Catinella aprica Hubricht, 1968 -- valid -- diurnal ambersnail
  Catinella avara (Say, 1824) -- valid -- suboval ambersnail
  Catinella hubrichti Grimm, 1960 -- valid -- Snowhill ambersnail
  Catinella oklahomarum (Webb, 1953) -- valid -- detritis ambersnail, detritus ambersnail
  Catinella pugilator Hubricht, 1961 -- valid -- weedpatch ambersnail
  Catinella rehderi (Pilsbry, 1948) -- valid -- chrome ambersnail
  Catinella stretchiana (Bland, 1865) -- valid -- Sierra ambersnail
  Catinella vagans (Pilsbry, 1900) -- valid -- mudbank ambersnail
  Catinella wandae (Webb, 1953) -- valid -- slope ambersnail
  Catriona columbiana (O'Donoghue, 1922) -- valid -- red-tentacle cuthona
  Cavolinia gibbosa (d'Orbigny, 1836) -- valid -- gibbose cavoline
  Cavolinia inflexa (Lesueur, 1813) -- valid -- inflexed cavoline
  Cavolinia longirostris (Blainville, 1821) -- valid -- long-snout cavoline
  Cavolinia tridentata (Niebuhr, 1775) -- valid -- three-tooth cavoline
  Cavolinia uncinata (Rang, 1829) -- valid -- uncinate cavoline
  Cecilioides acicula (Muller, 1774) -- valid -- blind awlsnail
  Cecilioides apertus (Swainson, 1840) -- valid -- obtuse awlsnail
  Cepaea hortensis (Muller, 1774) -- valid -- white-lip gardensnail
  Cepaea nemoralis (Linnaeus, 1758) -- valid -- grovesnail
  Cerastoderma elegantulum Beck, 1842 -- valid -- elegant dwarf cockle
  Cerastoderma pinnulatum (Conrad, 1831) -- valid -- northern dwarf cockle
  Ceratostoma foliatum (Gmelin, 1791) -- valid -- foliate thornmouth
  Ceratozona squalida (C. B. Adams, 1845) -- valid -- eastern surf chiton
  Cerberilla mosslandica McDonald and Nybakken, 1975 -- valid -- brown burrowing aeolis
  Cerion incanum (A. Binney, 1851) -- valid -- gray peanut-snail, gray cerion
  Cerithidea californica (Haldeman, 1840) -- valid -- California hornsnail
  Cerithidea costata (E. M. da Costa, 1778) -- valid -- costate hornsnail
  Cerithidea pliculosa (Menke, 1829) -- valid -- plicate hornsnail
  Cerithidea scalariformis (Say, 1825) -- valid -- ladder hornsnail
  Cerithium atratum (Born, 1778) -- valid -- dark cerith
  Cerithium eburneum Bruguiere, 1792 -- valid -- ivory cerith
  Cerithium guinaicum Philippi, 1849 -- valid -- Guinea cerith
  Cerithium litteratum (Born, 1778) -- valid -- stocky cerith
  Cerithium lutosum Menke, 1828 -- valid -- variable cerith
  Cerithium muscarum Say, 1822 -- valid -- flyspeck cerith
  Chaceia ovoidea (Gould, 1851) -- valid -- wartneck piddock
  Chaenaxis tuba (Pilsbry and Ferriss, 1906) -- valid -- hollow tuba
  Chaetopleura apiculata (Say, 1834) -- valid -- eastern beaded chiton
  Chaetopleura janeirensis (J. E. Gray, 1828) -- valid -- West Indian ribbed chiton
  Chama arcana Bernard, 1976 -- valid -- secret jewelbox
  Chama congregata Conrad, 1833 -- valid -- corrugate jewelbox
  Chama florida Lamarck, 1819 -- valid -- pretty jewelbox
  Chama lactuca Dall, 1886 -- valid -- milky jewelbox
  Chama macerophylla Gmelin, 1791 -- valid -- leafy jewelbox
  Chama sarda Reeve, 1847 -- valid -- cherry jewelbox
  Chama sinuosa Broderip, 1835 -- valid -- smooth-edge jewelbox
  Charonia tritonis variegata (Lamarck, 1816) -- valid -- Atlantic trumpet triton
  Cheilea equestris (Linnaeus, 1758) -- valid -- false cup-and-saucer
  Chelidonura hirundinina (Quoy and Gaimard, 1833) -- valid -- leech aglaja, swallowtail aglaja
  Chelidonura sabina Er. Marcus and Ev. Marcus, 1970 -- valid -- Sabine Island aglaja
  Chione californiensis (Broderip, 1835) -- valid -- California venus
  Chione cancellata (Linnaeus, 1767) -- valid -- cross-barred venus
  Chione clenchi Pulley, 1952 -- invalid -- Clench venus
  Chione grus (Holmes, 1858) -- invalid -- gray pygmy venus
  Chione paphia (Linnaeus, 1767) -- valid -- king venus
  Chione puber (Bory Saint-vincent, 1927) -- invalid -- downy venus
  Chione pygmaea (Lamarck, 1818) -- invalid -- pygmy venus
  Chione undatella (G. B. Sowerby I, 1835) -- valid -- frilled venus
  Chiton tuberculatus Linnaeus, 1758 -- valid -- West Indian green chiton
  Chlamydoconcha orcutti Dall, 1884 -- valid -- Orcutt nakedclam
  Chlamys albida (R. Arnold, 1906) -- valid -- white scallop
  Chlamys behringiana (Middendorff, 1849) -- valid -- Bering scallop
  Chlamys hastata (G. B. Sowerby II, 1842) -- valid -- spear scallop, spiny scallop
  Chlamys islandica (Müller, 1776) -- valid -- Iceland scallop
  Chlamys jordani Arnold, 1903 -- valid -- Jordan scallop
  Chlamys lowei (Hertlein, 1935) -- valid -- Lowe scallop
  Chlamys rubida (Hinds, 1845) -- valid -- reddish scallop
  Chondropoma dentatum (Say, 1825) -- valid -- crenulate horn
  Chromodoris clenchi (Russell, 1935) -- valid -- harlequin blue doris
  Chromodoris nyalya Ev. Marcus and Er. Marcus, 1967 -- valid -- red-line blue doris
  Cincinnatia comalensis (Pilsbry and Ferriss, 1906) -- invalid -- Comal Siltsnail
  Cincinnatia floridana (Frauenfeld, 1863) -- invalid -- hyacinth siltsnail
  Cincinnatia fraterna F. G. Thompson, 1968 -- invalid -- creek siltsnail
  Cincinnatia helicogyra F. G. Thompson, 1968 -- invalid -- crystal siltsnail
  Cincinnatia integra (Say, 1821) -- valid -- Midland Siltsnail
  Cincinnatia mica F. G. Thompson, 1968 -- invalid -- Ichetucknee siltsnail
  Cincinnatia monroensis (Dall, 1885) -- invalid -- Enterprise siltsnail
  Cincinnatia parva F. G. Thompson, 1968 -- invalid -- pygmy siltsnail
  Cincinnatia petrifons F. G. Thompson, 1968 -- invalid -- Rock Springs siltsnail
  Cincinnatia ponderosa F. G. Thompson, 1968 -- invalid -- ponderous siltsnail
  Cincinnatia vanhyningi (Vanatta, 1934) -- invalid -- Seminole Siltsnail
  Cincinnatia wekiwae F. G. Thompson, 1968 -- invalid -- Wekiwa Siltsnail
  Cipangopaludina chinensis malleata (Reeve, 1863) -- valid -- Chinese mysterysnail
  Cipangopaludina japonica (von Martens, 1861) -- valid -- Japanese mysterysnail
  Circomphalus strigillinus (Dall, 1902) -- valid -- empress venus
  Circulus multistriatus (A. E. Verrill, 1884) -- valid -- threaded vitrinella
  Circulus suppressus (Dall, 1889) -- valid -- suppressed vitrinella
  Cittarium pica (Linnaeus, 1758) -- valid -- West Indian topsnail
  Clappia cahabensis Clench, 1965 -- valid -- Cahaba pebblesnail, Armored Siltsnail
  Clappia umbilicata (Walker, 1904) -- valid -- umbilicate pebblesnail, Pumpkin Siltsnail
  Clinocardium blandum (Gould, 1850) -- valid -- smooth cockle, low-rib cockle
  Clinocardium californiense (Deshayes, 1839) -- valid -- california cockle, Aleutian cockle
  Clinocardium ciliatum (Fabricius, 1780) -- valid -- hairy cockle
  Clinocardium nuttallii (Conrad, 1837) -- valid -- Nuttall cockle
  Clio cuspidata (Bosc, 1802) -- valid -- cuspidate clio
  Clio polita (Pelseneer, 1888) -- valid -- two-keel clio
  Clio pyramidata Linnaeus, 1767 -- valid -- pyramid clio
  Clio recurva (Children, 1823) -- valid -- wavy clio
  Cocculina casanica Dall, 1919 -- valid -- alaska cocculina
  Cocculina reticulata A. E. Verrill, 1885 -- valid -- reticulate cocculina
  Cochlicella barbara (Linnaeus, 1758) -- valid -- potbellied helicellid
  Cochlicopa lubrica (Muller, 1774) -- valid -- glossy pillar
  Cochlicopa lubricella (Porro, 1838) -- valid -- thin pillar
  Cochlicopa morseana (Doherty, 1878) -- valid -- appalachian pillar
  Cochlicopa nitens (Gallenstein, 1848) -- valid -- robust pillar
  Cochliolepis parasitica Stimpson, 1858 -- valid -- parasitic scalesnail
  Cochliolepis striata Dall, 1889 -- valid -- striate scalesnail
  Cochliopina riograndensis (Pilsbry and Ferriss, 1906) -- valid -- Spiral Pebblesnail
  Cochlodinella poeyana (d'Orbigny, 1841) -- valid -- truncate urocoptid
  Codakia costata (d'Orbigny, 1842) -- valid -- costate lucine
  Codakia cubana Dall, 1901 -- valid -- Cuba lucine
  Codakia orbicularis (Linnaeus, 1758) -- valid -- tiger lucine
  Codakia orbiculata (Montagu, 1808) -- valid -- dwarf tiger lucine
  Codakia pectinella (C. B. Adams, 1852) -- valid -- little-comb lucine
  Coleophysis carinata (Carpenter, 1857) -- valid -- keeled barrel-bubble
  Coleophysis harpa -- valid -- harp barrel-bubble
  Collisella alveus (Conrad, 1831) -- valid -- bowl limpet
  Collisella asmi (Middendorff, 1849) -- valid -- black limpet
  Collisella borealis Linberg, 1982 -- valid -- boreal limpet
  Collisella digitalis Rathke, 1833 -- valid -- ribbed limpet
  Collisella instabilis (Gould, 1846) -- valid -- unstable limpet
  Collisella jamaicensis (Gmelin, 1791) -- valid -- jamaica limpet
  Collisella leucopleura (Gmelin, 1791) -- valid -- black-rib limpet
  Collisella limatula -- valid -- file limpet
  Collisella ochracea (Dall, 1871) -- valid -- yellow limpet
  Collisella pelta Rathke, 1833 -- valid -- shield limpet
  Collisella scabra (Gould, 1846) -- valid -- rough limpet
  Collisella triangularis (Carpenter, 1864) -- valid -- triangular limpet
  Colubraria obscura (Reeve, 1844) -- valid -- obscure dwarf triton
  Columbella mercatoria (Linnaeus, 1758) -- valid -- West Indian dovesnail
  Columbella rusticoides Heilprin, 1886 -- valid -- rusty dovesnail
  Columella edentula (Draparnaud, 1805) -- valid -- toothless column
  Columella simplex (Gould, 1840) -- valid -- high-spire column
  Colus barbarinus Dall, 1919 -- valid -- Santa Barbara whelk
  Colus caelatus (A. E. Verrill and Smith, 1880) -- valid -- carved whelk
  Colus errones Dall, 1919 -- valid -- wayward whelk
  Colus herendeenii (Dall, 1902) -- valid -- thin-ribbed whelk
  Colus islandicus (Mohr, 1786) -- valid -- Iceland whelk
  Colus ombronius Dall, 1919 -- valid -- shady whelk
  Colus periscelidus (Dall, 1891) -- valid -- garter whelk
  Colus pubescens (A. E. Verrill, 1882) -- valid -- hairy whelk
  Colus pygmaeus (Gould, 1841) -- valid -- pygmy whelk
  Colus roseus (Dall, 1877) -- valid -- rosy whelk
  Compressidens ophiodon (Dall, 1881) -- valid -- flattened toothshell
  Compressidens pressus (Pilsbry and Sharp, 1897) -- valid -- compressed toothshell
  Compressidens stearnsii Pilsbry and Sharp, 1897 -- valid -- stearns toothshell
  Compsomyax subdiaphana (Carpenter, 1864) -- valid -- milky venus
  Conchocele bisecta (Conrad, 1849) -- valid -- giant cleftclam
  Conchocele disjuncta Gabb, 1866 -- valid -- disjunct cleftclam
  Conualevia alba Collier and Farmer, 1964 -- valid -- white smooth-horn doris
  Conus armiger Crosse, 1858 -- valid -- mace cone
  Conus attenuatus Reeve, 1844 -- valid -- slender cone
  Conus californicus Hinds, 1844 -- valid -- California cone
  Conus cancellatus Hwass, 1792 -- valid -- cancellate cone
  Conus daucus Hwass, 1792 -- valid -- carrot cone
  Conus ermineus Born, 1778 -- valid -- agate cone
  Conus flamingo Petuch, 1980 -- valid -- flamingo cone
  Conus flavescens G. B. Sowerby II, 1834 -- valid -- flame cone
  Conus floridanus Gabb, 1868 -- valid -- florida cone
  Conus granulatus Linnaeus, 1758 -- valid -- glory-of-the-Atlantic cone
  Conus jaspideus Gmelin, 1791 -- valid -- jasper cone
  Conus mindanus Hwass, 1792 -- valid -- Bermuda cone
  Conus mus Hwass, 1792 -- valid -- mouse cone
  Conus patae Abbott, 1971 -- valid -- sunrise cone
  Conus regius Gmelin, 1791 -- valid -- crown cone
  Conus sennottorum Rehder and Abbott, 1951 -- valid -- speckled cone
  Conus spurius Gmelin, 1791 -- valid -- alphabet cone
  Conus stimpsoni Dall, 1902 -- valid -- yellow cone
  Cooperella atlantica Rehder, 1943 -- valid -- Atlantic cooperclam
  Cooperella subdiaphana (Carpenter, 1864) -- valid -- shiny cooperclam
  Cooperellidae Dall, 1900 -- invalid
  Coralliophaga coralliophaga (Gmelin, 1791) -- valid -- coralclam
  Coralliophila aberrans (C. B. Adams, 1850) -- valid -- globose coralsnail
  Coralliophila caribaea Abbott, 1958 -- valid -- Caribbean coralsnail
  Coralliophila galea (Reeve, 1846) -- valid -- helmet coralsnail
  Coralliophila scalariformis (Lamarck, 1822) -- valid -- staircase coralsnail
  Corambe pacifica Macfarland and O'donoghue, 1929 -- valid -- frost-spot corambe
  Corbicula manilensis Philippi -- valid -- asian clam
  Corbula barrattiana C. B. Adams, 1852 -- valid -- barratt corbula, truncate corbula
  Corbula chittyana C. B. Adams, 1852 -- valid -- snubnose corbula
  Corbula contracta Say, 1822 -- valid -- contracted corbula
  Corbula cubaniana D'Orbigny, 1842 -- valid -- cuba corbula
  Corbula cymella Dall, 1881 -- valid -- wavy corbula
  Corbula dietziana C. B. Adams, 1852 -- valid -- dietz corbula, rose corbula
  Corbula kelseyi Dall, 1916 -- valid -- kelsey corbula
  Corbula krebsiana C. B. Adams, 1852 -- valid -- Krebs corbula
  Corbula luteola Carpenter, 1864 -- valid -- western corbula
  Corbula nasuta Sowerby, 1833 -- valid -- snubby corbula
  Corbula nuciformis Sowerby, 1833 -- valid -- nut corbula
  Corbula porcella Dall, 1916 -- valid -- ribbed corbula
  Corbula swiftiana C. B. Adams, 1852 -- valid -- swift corbula, radial-ridged corbula
  Corolla calceola (A. E. Verrill, 1880) -- valid -- Atlantic corolla
  Corolla spectabilis Dall, 1871 -- valid -- spectacular corolla
  Cosa caribaea (Carpenter, 1864) -- valid -- caribbean philobrya
  Cosmioconcha calliglypta (Dall and Simpson, 1901) -- valid -- flame dovesnail
  Costasiella ocellifera (Simroth, 1895) -- valid -- eyespot costasiella
  Couthouyella striatula (Couthouy, 1838) -- valid -- northern rough wentletrap
  Crassicardia crassidens (Broderip and Sowerby, 1829) -- valid -- thick carditid
  Crassinella lunulata (Conrad, 1834) -- valid -- lunate crassinella
  Crassinella martinicensis (d'Orbigny, 1842) -- valid -- Martinique crassinella
  Crassinella pacifica (C. B. Adams, 1852) -- valid -- Pacific crassinella
  Crassostrea gigas (Thunberg, 1793) -- valid -- Pacific giant oyster, Pacific oyster
  Crassostrea virginica (Gmelin, 1791) -- valid -- eastern oyster
  Crenella decussata (Montagu, 1808) -- valid -- cross-sculpture crenella
  Crenella divaricata (d'Orbigny, 1842) -- valid -- spreading-sculpture crenella
  Crenella faba (Muller, 1776) -- valid -- bean crenella
  Crenella fragilis A. E. Verrill, 1885 -- valid -- fragile crenella
  Crenella glandula (Totten, 1834) -- valid -- glandular crenella
  Crenella leana Dall, 1897 -- valid -- lea crenella
  Crenella pectinula (Gould, 1841) -- valid -- little-comb crenella
  Crenella skomma (Schwengel, 1944) -- valid -- joking crenella
  Crepidula aculeata (Gmelin, 1791) -- valid -- spiny slippersnail
  Crepidula adunca G. B. Sowerby I, 1825 -- valid -- hooked slippersnail
  Crepidula convexa Say, 1822 -- valid -- convex slippersnail
  Crepidula fornicata (Linnaeus, 1758) -- valid -- common Atlantic slippersnail
  Crepidula grandis Middendorff, 1849 -- valid -- great slippersnail
  Crepidula maculosa Conrad, 1846 -- valid -- spotted slippersnail
  Crepidula naticarum Williamson, 1905 -- valid -- cheeky slippersnail
  Crepidula nummaria Gould, 1846 -- valid -- western white slippersnail
  Crepidula onyx G. B. Sowerby I, 1824 -- valid -- onyx slippersnail
  Crepidula perforans (Valenciennes, 1846) -- valid -- white slippersnail
  Crepidula plana Say, 1822 -- valid -- eastern white slippersnail
  Crepidula striolata Menke, 1851 -- valid -- ridged slippersnail
  Crepipatella charybdis (S. S. Berry, 1940) -- valid -- greedy slippersnail
  Crepipatella lingulata (Gould, 1846) -- valid -- pacific half-slippersnail
  Crepipatella orbiculata (Dall, 1919) -- valid -- round slippersnail
  Creseis acicula (Rang, 1828) -- valid -- straight needle-pteropod
  Creseis virgula (Rang, 1828) -- valid -- curved needle-pteropod
  Crimora coneja Er. Marcus, 1961 -- valid -- rabbit doris
  Crossata californica (Hinds, 1843) -- valid -- California frogsnail
  Crucibulum auricula (Gmelin, 1791) -- valid -- West Indian cup-and-saucer
  Crucibulum spinosum (G. B. Sowerby I, 1824) -- valid -- spiny cup-and-saucer
  Crucibulum striatum Say, 1824 -- valid -- striate cup-and-saucer
  Cryptochiton stelleri (Middendorff, 1847) -- valid -- giant Pacific chiton
  Cryptoconchus floridanus (Dall, 1889) -- valid -- white-barred chiton
  Cryptomastix devia (Gould, 1846) -- valid -- Puget oregonian
  Cryptomastix germana (Gould, 1851) -- valid -- pygmy oregonian
  Cryptomastix hendersoni (Pilsbry, 1928) -- valid -- Columbia oregonian
  Cryptomastix magnidentata (Pilsbry, 1940) -- valid -- Mission Creek oregonian
  Cryptomastix mullani (Bland and J. G. Cooper, 1861) -- valid -- Coeur d'Alene oregonian
  Cryptomastix sanburni (W. G. Binney, 1886) -- valid -- Kingston oregonian
  Cryptomya californica (Conrad, 1837) -- valid -- california softshell clam, California softshell
  Cryptopecten phrygium (Dall, 1886) -- valid -- spathate scallop
  Cryptostrea permollis (G. B. Sowerby II, 1871) -- invalid -- sponge oyster
  Cumanotus beaumonti (Eliot, 1906) -- valid -- polyp aeolis
  Cumberlandia monodonta (Say, 1829) -- valid -- spectaclecase
  Cumingia californica Conrad, 1837 -- valid -- California semele
  Cumingia coarctata G. B. Sowerby I, 1833 -- valid -- contracted semele
  Cumingia tellinoides (Conrad, 1831) -- valid -- tellin semele
  Cuna dalli Vanatta, 1904 -- valid -- dall condylclam, trigonal condylclam
  Cuspidaria alternata (d'Orbigny, 1842) -- valid -- alternate dipperclam
  Cuspidaria glacialis (G. O. Sars, 1878) -- valid -- glacial dipperclam
  Cuspidaria jeffreysi (Dall, 1881) -- valid -- jeffrey dipperclam
  Cuspidaria media A. E. Verrill and Bush, 1898 -- valid -- amedian dipperclam, median dipperclam
  Cuspidaria microrhina Dall, 1886 -- valid -- little-snout dipperclam
  Cuspidaria obesa (Loven, 1846) -- valid -- obese dipperclam
  Cuspidaria parapodema Bernard, 1969 -- valid -- California dipperclam
  Cuspidaria pellucida Stimpson, 1853 -- valid -- translucent dipperclam
  Cuspidaria rostrata (Spengler, 1793) -- valid -- rostrate dipperclam
  Cuspidaria subglacialis Dall, 1913 -- valid -- subglacial dipperclam
  Cuthona abronia (MacFarland, 1966) -- valid -- colorful cuthona
  Cuthona albocrusta (MacFarland, 1966) -- valid -- white-crust cuthona
  Cuthona aurantia (Alder and Hancock, 1842) -- valid -- corange-tip cuthona
  Cuthona cocoachroma Williams and Gosliner, 1979 -- valid -- brown cuthona
  Cuthona flavovulta (MacFarland, 1966) -- valid -- yellowish cuthona
  Cuthona fulgens (MacFarland, 1966) -- valid -- black-and-yellow cuthona
  Cuthona lagunae (O'Donoghue, 1926) -- valid -- orange-face cuthona
  Cuthona perca (Er. Marcus, 1958) -- valid -- lake merritt cuthona
  Cuthona phoenix Gosliner, 1981 -- valid -- bornagain cuthona
  Cuthona virens (MacFarland, 1966) -- valid -- green cuthona
  Cuvierina columnella (Rang, 1827) -- valid -- cigar pteropod
  Cyathodonta dubiosa Dall, 1915 -- valid -- doubtful thracid
  Cyclinella tenuis (Recluz, 1852) -- valid -- thin cyclinella
  Cyclocardia armilla (Dall, 1903) -- valid -- bracelet cyclocardia
  Cyclocardia bailyi (J. Q. Burch, 1944) -- valid -- bumpy cyclocardia
  Cyclocardia barbarensis (Stearns, 1891) -- valid -- Santa Barbara cyclocardia
  Cyclocardia borealis (Conrad, 1831) -- valid -- northern cyclocardia
  Cyclocardia crebricostata (Krause, 1885) -- valid -- many-ribbed cyclocardia, many-rib cyclocardia
  Cyclocardia incisa (Dall, 1903) -- valid -- cut cyclocardia
  Cyclocardia novangliae (E. S. Morse, 1869) -- valid -- New England cyclocardia
  Cyclocardia ovata (Riabinina, 1952) -- valid -- ovate cyclocardia
  Cyclocardia rjabininae (Scarlato, 1955) -- valid -- rjabinina cyclocardia
  Cyclocardia umnaka (Willett, 1932) -- valid -- umnak cyclocardia, Aleutian cyclocardia
  Cyclocardia ventricosa (Gould, 1850) -- valid -- stout cyclocardia
  Cyclonaias tuberculata (Rafinesque, 1820) -- valid -- purple wartyback
  Cyclopecten alaskensis (Dall, 1871) -- valid -- alaska glass-scallop
  Cyclopecten barbarensis Grau, 1959 -- valid -- santa barbara scallop, Santa Barbara glass-scallop
  Cyclopecten catalinensis (Willett, 1931) -- valid -- catalina scallop, Catalina glass-scallop
  Cyclopecten nanus A. E. Verrill and Bush, 1897 -- valid -- adwarf scallop, dwarf glass-scallop
  Cyclopecten thalassinus (Dall, 1886) -- valid -- cancellate dwarf scallop, costate glass-scallop
  Cyclostrema cancellatum Marryat, 1818 -- valid -- cancellate cyclostreme
  Cyclostrema huesonicum (Dall, 1927) -- valid -- Key West cyclostreme
  Cyclostrema tortuganum (Dall, 1927) -- valid -- Tortugas cyclostreme
  Cyerce antillensis Engel, 1927 -- valid -- Antilles glass-slug
  Cyerce cristallina (Trinchese, 1881) -- valid -- harlequin glass-slug
  Cylichna alba (T. Brown, 1827) -- valid -- white chalice-bubble
  Cylichna diegensis (Dall, 1919) -- valid -- San Diego chalice-bubble
  Cylichna eburnea A. E. Verrill, 1885 -- valid -- ivory chalice-bubble
  Cylichna linearis Jeffreys, 1867 -- valid -- lined chalice-bubble
  Cylichna nucleolus (Reeve, 1855) -- valid -- kernel chalice-bubble
  Cylichna occulta (Mighels and C. B. Adams, 1842) -- valid -- concealed chalice-bubble
  Cymatium comptum (A. Adams, 1855) -- valid -- dwarf triton
  Cymatium cynocephalum (Lamarck, 1816) -- valid -- doghead triton
  Cymatium femorale (Linnaeus, 1758) -- valid -- angular triton
  Cymatium labiosum (W. Wood, 1828) -- valid -- lip triton
  Cymatium muricinum (Roding, 1798) -- valid -- knobbed triton
  Cymatium nicobaricum (Roding, 1798) -- valid -- goldmouth triton
  Cymatium rehderi A. H. Verrill, 1950 -- valid -- twisted triton
  Cymatium tenuiliratum (Lischke, 1873) -- valid -- slender triton
  Cymatoica orientalis (Dall, 1890) -- valid -- western tellin
  Cymbovula acicularis (Lamarck, 1810) -- valid -- West Indian simnia
  Cyphoma aureocinctum (Dall, 1889) -- valid -- gold-line cyphoma
  Cyphoma gibbosum (Linnaeus, 1758) -- valid -- flamingo tongue
  Cyphoma rhomba Cate, 1978 -- valid -- bullroarer cyphoma
  Cyphoma signatum Pilsbry and McGinty, 1939 -- valid -- fingerprint cyphoma
  Cypraea cervus Linnaeus, 1771 -- valid -- atlantic deer cowrie
  Cypraea cinerea Gmelin, 1791 -- valid -- atlantic gray cowrie
  Cypraea spadicea Swainson, 1836 -- valid -- chestnut cowrie
  Cypraea surinamensis G. Perry, 1811 -- valid -- surinam cowrie
  Cypraea zebra Linnaeus, 1758 -- valid -- measled cowrie
  Cypraecassis testiculus (Linnaeus, 1758) -- valid -- reticulate cowrie-helmet
  Cyprogenia aberti (Conrad, 1850) -- valid -- western fanshell
  Cyprogenia stegaria (Rafinesque, 1820) -- valid -- fanshell
  Cyrenoida floridana (Dall, 1896) -- valid -- Florida marshclam
  Cyrtodaria kurriana Dunker, 1861 -- valid -- Kurr propellerclam
  Cyrtodaria siliqua (Spengler, 1793) -- valid -- northern propellerclam
  Cyrtonaias tampicoensis (Lea, 1838) -- valid -- Tampico pearlymussel, Tampico pearly mussel
  Cyrtopleura costata (Linnaeus, 1758) -- valid -- angelwing
  Cystiscus politus (Carpenter, 1857) -- valid -- polished marginella
  Dacrydium elegantulum Soot-Ryen, 1955 -- valid -- elegant mussel
  Dacrydium vitreum (Moller, 1842) -- valid -- glassy mussel, Arctic glassy-mussel
  Delectopecten vancouverensis (Whiteaves, 1893) -- valid -- Vancouver scallop
  Delectopecten vitreus (Gmelin, 1791) -- valid -- vitreous scallop
  Dendostrea frons (Linnaeus, 1758) -- valid -- frond oyster
  Dendronotus albus MacFarland, 1966 -- valid -- white frond-aeolis
  Dendronotus diversicolor Robilliard, 1970 -- valid -- multicolor frond-aeolis
  Dendronotus frondosus (Ascanius, 1774) -- valid -- frond-aeolis
  Dendronotus iris J. G. Cooper, 1863 -- valid -- giant frond-aeolis
  Dendronotus robustus A. E. Verrill, 1870 -- valid -- robust frond-aeolis
  Dendronotus rufus O'Donoghue, 1921 -- valid -- red frond-aeolis
  Dendronotus subramosus MacFarland, 1966 -- valid -- stubby frond-aeolis
  Dentalium agassizi Pilsbry and Sharp, 1897 -- valid -- stained tuskshell
  Dentalium americanum Chenu, 1843 -- valid -- American tuskshell
  Dentalium gouldii Dall, 1889 -- valid -- gould tuskshell
  Dentalium laqueatum A. E. Verrill, 1885 -- valid -- reticulate tuskshell
  Dentalium neohexagonum Sharp and Pilsbry, 1897 -- valid -- hexagon tuskshell
  Dentalium vallicolens Raymond, 1904 -- valid -- trench tuskshell
  Dentimargo aureocinctus (Stearns, 1872) -- valid -- gold-line marginella
  Dentimargo eburneolus (Conrad, 1834) -- valid -- tan marginella
  Dentistyla asperrima (Dall, 1881) -- valid -- rough topsnail
  Depressiscala nautlae (Morch, 1874) -- valid -- slender wentletrap
  Depressiscala nitidella (Dall, 1889) -- valid -- mottled wentletrap
  Depressiscala polita (G. B. Sowerby II, 1844) -- valid -- polished wentletrap
  Dermomurex pauperculus (C. B. Adams, 1850) -- valid -- beggar aspella
  Deroceras caruanae (Pollonera, 1891) -- valid -- longneck field slug
  Deroceras hesperium Pilsbry, 1944 -- valid -- evening field slug, evening fieldslug
  Deroceras heterura Pilsbry, 1944 -- valid -- false marsh slug, marsh slug
  Deroceras laeve (Muller, 1774) -- valid -- meadow slug
  Deroceras monentolophus Pilsbry, 1944 -- valid -- one-ridge field slug, one-ridge fieldslug
  Deroceras reticulatum (Muller, 1774) -- valid -- gray field slug, gray fieldslug
  Detracia bulloides (Montagu, 1808) -- valid -- bubble melampus
  Detracia floridana (Pfeiffer, 1856) -- valid -- florida melampus
  Diacria quadridentata (de Blainville, 1821) -- valid -- four-tooth cavoline
  Diacria trispinosa (de Blainville, 1821) -- valid -- three-spine cavoline
  Diaphana brunnea Dall, 1919 -- valid -- brown paper-bubble, brown paperbubble
  Diaphana californica Dall, 1919 -- valid -- california paper-bubble, California paperbubble
  Diaphana minuta Brown, 1827 -- valid -- arctic paper-bubble, weak paper-bubble, Arctic paperbubble
  Diaulula sandiegensis (J. G. Cooper, 1863) -- valid -- ringed doris
  Dimya argentea Dall, 1886 -- valid -- silver dimyid
  Dimya californiana S. S. Berry, 1936 -- valid -- California dimyid
  Dimya coralliotis S. S. Berry, 1944 -- valid -- coral dimyid
  Dimyella starcki Moore, 1969 -- valid -- starck dimyid
  Dinocardium robustum (Lightfoot, 1786) -- valid -- Atlantic giant cockle
  Diodora arcuata (G. B. Sowerby II, 1862) -- valid -- arcuate keyhole limpet
  Diodora arnoldi J. H. McLean, 1966 -- valid -- neat-rib keyhole limpet
  Diodora aspera (Rathke, 1833) -- valid -- rough keyhole limpet
  Diodora bermudensis (Dall and Bartsch, 1911) -- valid -- Bermuda keyhole limpet
  Diodora cayenensis (Lamarck, 1822) -- valid -- Cayenne keyhole limpet
  Diodora fluviana (Dall, 1889) -- valid -- Gulf Stream keyhole limpet
  Diodora minuta (Lamarck, 1822) -- valid -- dwarf keyhole limpet
  Diodora variegata G. B. Sowerby II, 1862 -- valid -- variegate keyhole limpet
  Diodora viridula (Lamarck, 1822) -- valid -- green keyhole limpet
  Diplodonta aleutica Dall, 1901 -- valid -- Aleutian diplodon
  Diplodonta candeana (d'Orbigny, 1842) -- valid -- Cande diplodon
  Diplodonta impolita S. S. Berry, 1953 -- valid -- rough diplodon
  Diplodonta notata Dall and Simpson, 1901 -- valid -- marked diplodon
  Diplodonta nucleiformis Wagner, 1838 -- valid -- nut-shaped diplodon, nut diplodon
  Diplodonta orbella (Gould, 1851) -- valid -- orb diplodon
  Diplodonta punctata (Say, 1822) -- valid -- Atlantic diplodon
  Diplodonta semiaspera Philippi, 1836 -- valid -- pimpled diplodon
  Diplodonta soror C. B. Adams, 1852 -- valid -- sister diplodon
  Diplodonta subglobosa C. B. Adams, 1852 -- valid -- subglobose diplodon
  Diplodonta venezuelensis Dunker, 1848 -- valid -- Venezuela diplodon
  Diplodonta verrilli Dall, 1900 -- valid -- verrill diplodon, inflated diplodon
  Diplosolenodes occidentale (Guilding, 1825) -- valid -- spotted leatherleaf
  Diplothyra smithii Tryon, 1862 -- valid -- oyster piddock
  Dirona albolineata MacFarland, 1905 -- valid -- white-line dirona
  Dirona aurantia Hurst, 1966 -- valid -- golden dirona
  Dirona picta MacFarland, 1905 -- valid -- painted dirona
  Discodoris heathi MacFarland, 1905 -- valid -- gritty doris
  Disconaias salinasensis (Simpson, 1908) -- invalid -- Salina mucket
  Discotectonica discus (Philippi, 1844) -- valid -- keeled sundial
  Discus bryanti (Harper, 1881) -- valid -- saw-tooth disc, sawtooth disc
  Discus catskillensis (Pilsbry, 1896) -- valid -- angular disc
  Discus clappi (Pilsbry, 1924) -- valid -- channelled disc
  Discus macclintocki (F. C. Baker, 1928) -- valid -- iowa pleistocene snail, Pleistocene disc
  Discus marmorensis H. B. Baker, 1932 -- valid -- marbled disc
  Discus nigrimontanus (Pilsbry, 1924) -- valid -- Black Mountain disc
  Discus patulus (Deshayes, 1830) -- valid -- domed disc
  Discus rotundatus (Muller, 1774) -- valid -- rotund disc
  Distorsio clathrata (Lamarck, 1816) -- valid -- Atlantic distorsio
  Distorsio perdistorta Fulton, 1938 -- valid -- hunchback distorsio
  Divaricella dentata (W. Wood, 1815) -- valid -- dentate lucine
  Divaricella quadrisulcata (d'Orbigny, 1842) -- valid -- cross-hatched lucine
  Dolabrifera dolabrifera (Rang, 1828) -- valid -- warty seacat
  Dolicholatirus pauli (McGinty, 1955) -- valid -- slender latirus
  Donax californicus Conrad, 1837 -- valid -- California beanclam
  Donax gouldii Dall, 1921 -- valid -- Gould beanclam
  Donax texasianus Philippi, 1847 -- valid -- texas coquina
  Donax variabilis Say, 1822 -- valid -- variable coquina
  Dondice occidentalis (Engel, 1925) -- valid -- western dondice
  Doridella obscura A. E. Verrill, 1870 -- valid -- obscure corambe
  Doriopsilla albopunctata (J. G. Cooper, 1863) -- valid -- salted yellow doris, white-spot porostome
  Doriopsilla nigromaculata (Cockerell In Coc. and Eliot, 1905) -- valid -- tiny black-spot doris
  Dosidicus gigas (D'Orbigny, 1835 in 1834-1847) -- valid -- jumbo squid
  Dosinia discus (Reeve, 1850) -- valid -- disk dosinia
  Dosinia elegans (Conrad, 1843) -- valid -- elegant dosinia
  Doto amyra Er. Marcus, 1961 -- valid -- hammerhead doto
  Doto columbiana O'Donoghue, 1921 -- valid -- British Columbia doto
  Doto coronata (Gmelin, 1791) -- valid -- crown doto
  Doto kya Er. Marcus, 1961 -- valid -- dark doto
  Drepanotrema aeruginosus (Morelet, 1851) -- valid -- rusty rams-horn
  Drepanotrema cimex (Moricand, 1839) -- valid -- ridged rams-horn
  Drepanotrema kermatoides (d'Orbigny, 1835) -- valid -- crested rams-horn
  Dromus dromas (Lea, 1834) -- valid -- dromedary pearlymussel, dromedary pearly mussel
  Dryachloa dauca F. G. Thompson and H. G. Lee, 1980 -- valid -- carrot glass
  Drymaeus dominicus (Reeve, 1850) -- valid -- master treesnail
  Drymaeus dormani (W. G. Binney, 1857) -- valid -- manatee treesnail
  Drymaeus multilineatus (Say, 1825) -- valid -- lined treesnail
  Elimia acuta (Lea, 1831) -- valid -- Acute Elimia
  Elimia alabamensis (Lea, 1861) -- valid -- Mud Elimia
  Elimia albanyensis (Lea, 1864) -- valid -- Black-crest Elimia
  Elimia ampla (Anthony, 1854) -- valid -- Ample Elimia
  Elimia annettae (Goodrich, 1941) -- valid -- Lilyshoals Elimia
  Elimia arachnoidea (Anthony, 1854) -- valid -- Spider Elimia
  Elimia aterina (Lea, 1863) -- valid -- Coal Elimia
  Elimia athearni (Clench and Turner, 1956) -- valid -- Knobby Elimia
  Elimia bellacrenata (Haldeman, 1841) -- valid -- Princess Elimia
  Elimia bellula (Lea, 1861) -- valid -- Walnut Elimia
  Elimia bentoniensis (Lea, 1862) -- invalid -- rusty elimia
  Elimia boykiniana (Lea, 1840) -- valid -- Flaxen Elimia
  Elimia brevis (Reeve, 1860) -- valid -- short-spire elimia, Short Spire Elimia
  Elimia caelatura (Reeve, 1860) -- valid -- rippled elimia, Savannah Elimia
  Elimia cahawbensis (Lea, 1861) -- valid -- Cahaba Elimia
  Elimia capillaris (Lea, 1861) -- valid -- Spindle Elimia
  Elimia carinifera (Lamarck, 1822) -- valid -- Sharp-crest Elimia
  Elimia carinocostata (Lea, 1854) -- valid -- Fluted Elimia
  Elimia catenaria (Say, 1822) -- valid -- Gravel Elimia
  Elimia chiltonensis (Goodrich, 1941) -- valid -- Prune Elimia
  Elimia clara (Anthony, 1854) -- valid -- Riffle Elimia
  Elimia clausa (Lea, 1861) -- valid -- Closed Elimia
  Elimia clavaeformis (Lea, 1841) -- valid -- Club Elimia
  Elimia clenchi (Goodrich, 1924) -- valid -- Slackwater Elimia
  Elimia cochliaris (Lea, 1868) -- valid -- Cockle Elimia
  Elimia comalensis (Pilsbry, 1890) -- valid -- Balcones Elimia
  Elimia comma (Conrad, 1834) -- valid -- Hispid Elimia
  Elimia costifera (Reeve, 1861) -- valid -- Corded Elimia
  Elimia crenatella (Lea, 1860) -- valid -- Lacey Elimia
  Elimia curreyana (Lea, 1841) -- valid -- Amber Elimia
  Elimia curvicostata (Reeve, 1861) -- invalid -- graphite elimia
  Elimia cylindracea (Conrad, 1834) -- valid -- Cylinder Elimia
  Elimia dickinsoni (Clench and Turner, 1956) -- valid -- Stately Elimia
  Elimia dislocata (Reeve, 1861) -- valid -- Lapped Elimia
  Elimia ebenum (Lea, 1841) -- valid -- Ebony Elimia
  Elimia edgariana (Lea, 1841) -- valid -- Cumberland Elimia
  Elimia fascinans (Lea, 1861) -- valid -- Banded Elimia
  Elimia flava (Lea, 1862) -- valid -- Yellow Elimia
  Elimia floridensis (Reeve, 1860) -- valid -- Rasp Elimia, Waccasassa Elimia
  Elimia fusiformis (Lea, 1861) -- valid -- Fusiform Elimia
  Elimia gerhardti (Lea, 1862) -- invalid -- coldwater elimia
  Elimia hartmaniana (Lea, 1861) -- valid -- High-spired Elimia
  Elimia haysiana (Lea, 1843) -- valid -- Silt Elimia
  Elimia hydei (Conrad, 1834) -- invalid -- gladiator elimia
  Elimia impressa (Lea, 1841) -- valid -- Constricted Elimia
  Elimia inclinans (Lea, 1862) -- valid -- Slanted Elimia
  Elimia interrupta (Haldeman, 1840) -- valid -- knotty elimia
  Elimia interveniens (Lea, 1862) -- valid -- Slowwater Elimia
  Elimia jonesi (Goodrich, 1936) -- valid -- Hearty Elimia
  Elimia laeta (Jay, 1839) -- valid -- Ribbed Elimia
  Elimia laqueata (Say, 1829) -- valid -- Panel Elimia
  Elimia livescens (Menke, 1830) -- valid -- Liver Elimia
  Elimia mutabilis (Lea, 1862) -- valid -- Oak Elimia
  Elimia nassula (Conrad, 1834) -- valid -- round-rib elimia, Round-ribed Elimia
  Elimia olivula (Conrad, 1834) -- valid -- Caper Elimia
  Elimia paupercula (Lea, 1862) -- valid -- Sooty Elimia
  Elimia perstriata (Lea, 1852) -- valid -- Engraved Elimia
  Elimia pilsbryi (Goodrich, 1927) -- valid -- Rough-lined Elimia
  Elimia plicatostriata (Wetherby, 1876) -- invalid -- Carved Elimia
  Elimia porrecta (Lea, 1863) -- valid -- Nymph Elimia
  Elimia potosiensis (Lea, 1841) -- valid -- Pyramid Elimia
  Elimia proxima (Say, 1825) -- valid -- Sprite Elimia
  Elimia pupaeformis (Lea, 1864) -- valid -- Pupa Elimia
  Elimia pupoidea (Anthony, 1854) -- valid -- Bot Elimia
  Elimia pybasi (Lea, 1862) -- invalid -- brook elimia, spring elimia
  Elimia pygmaea (H. H. Smith, 1936) -- valid -- Pygmy Elimia
  Elimia semicarinata (Say, 1829) -- valid -- Fine-ridged Elimia
  Elimia showalteri (Lea, 1861) -- invalid -- compact elimia
  Elimia simplex (Say, 1825) -- valid -- Smooth Elimia
  Elimia striatula (Lea, 1842) -- valid -- File Elimia
  Elimia strigosa (Lea, 1841) -- valid -- Brook Elimia
  Elimia symmetrica (Haldeman, 1841) -- valid -- Symmetrical Elimia
  Elimia taitiana (Lea, 1841) -- valid -- Dented Elimia
  Elimia teres (Lea, 1841) -- valid -- Elegant Elimia
  Elimia troostiana (Lea, 1838) -- valid -- Mossy Elimia
  Elimia vanhyningiana (Goodrich, 1921) -- valid -- Goblin Elimia
  Elimia vanuxemiana (Lea, 1843) -- valid -- Cobble Elimia
  Elimia varians (Lea, 1861) -- valid -- Puzzle Elimia
  Elimia variata (Lea, 1861) -- valid -- Squat Elimia
  Elimia viennaensis (Lea, 1862) -- valid -- Slough Elimia
  Elimia virginica (Say, 1817) -- invalid -- Piedmont Elimia
  Ellipsaria lineolata (Rafinesque, 1820) -- valid -- butterfly mussel
  Elliptio ahenea (Lea, 1845) -- valid -- southern lance
  Elliptio angustata (Lea, 1831) -- valid -- Carolina lance
  Elliptio arca (Conrad, 1834) -- valid -- Alabama spike
  Elliptio arctata (Conrad, 1834) -- valid -- delicate spike
  Elliptio buckleyi (Lea, 1843) -- invalid -- Florida shiny spike
  Elliptio chipolaensis (Walker, 1905) -- valid -- Chipola slabshell
  Elliptio cistellaeformis (Lea, 1863) -- valid -- box spike
  Elliptio complanata (Lightfoot, 1786) -- valid -- eastern elliptio
  Elliptio congaraea (Lea, 1831) -- valid -- Carolina slabshell
  Elliptio crassidens (Lamarck, 1819) -- valid -- elephant-ear, elephantear
  Elliptio dariensis (Lea, 1842) -- valid -- Georgia elephantear
  Elliptio dilatata (Rafinesque, 1820) -- invalid -- spike
  Elliptio downiei (Lea, 1858) -- valid -- Satilla elephantear
  Elliptio fisheriana (Lea, 1838) -- valid -- northern lance
  Elliptio folliculata (Lea, 1838) -- valid -- pod lance
  Elliptio fraterna (Lea, 1852) -- valid -- brother spike
  Elliptio hopetonensis (Lea, 1838) -- valid -- Altamaha slabshell
  Elliptio icterina (Conrad, 1834) -- valid -- variable spike
  Elliptio jayensis (Lea, 1838) -- valid -- Florida spike, flat spike
  Elliptio lanceolata (Lea, 1828) -- valid -- yellow lance
  Elliptio macmichaeli Clench & Turner, 1956 -- invalid -- fluted elephant-ear
  Elliptio marsupiobesa Fuller, 1972 -- valid -- Cape Fear spike
  Elliptio nigella (Lea, 1852) -- valid -- winged spike
  Elliptio producta (Conrad, 1836) -- valid -- Atlantic spike
  Elliptio raveneli (Conrad, 1834) -- invalid -- Carolina spike
  Elliptio roanokensis (Lea, 1838) -- valid -- Roanoke slabshell
  Elliptio shepardiana (Lea, 1834) -- valid -- Altamaha lance
  Elliptio spinosa (Lea, 1836) -- valid -- Altamaha spinymussel
  Elliptio steinstansana R. I. Johnson & Clarke, 1983 -- invalid -- Tar River spinymussel, Tar spinymussel
  Elliptio waccamawensis (Lea, 1863) -- invalid -- Waccamaw spike
  Elliptio waltoni (B. H. Wright, 1888) -- invalid -- Florida lance
  Elliptoideus sloatianus (Lea, 1840) -- valid -- purple bankclimber
  Ellobium pellucens (Menke, 1830) -- valid -- white melampus
  Elysia chlorotica Gould, 1870 -- valid -- eastern emerald elysia, emerald elysia
  Elysia ornata (Swainson, 1840) -- valid -- ornate elysia
  Elysia papillosa A. E. Verrill, 1901 -- valid -- papillose elysia
  Elysia picta A. E. Verrill, 1901 -- valid -- painted elysia
  Elysia serca Er. Marcus, 1955 -- valid -- caribbean seagrass elysia, seagrass elysia
  Emarcusia morroensis Roller, 1972 -- valid -- orange-blotch aeolis
  Emarginula dentigera Heilprin, 1889 -- valid -- toothed emarginula
  Emarginula phrixodes Dall, 1927 -- valid -- ruffled emarginula
  Emarginula pumila (A. Adams, 1852) -- valid -- pygmy emarginula
  Emarginula sicula J. E. Gray, 1825 -- valid -- dagger emarginula
  Emarginula tuberculosa Libassi, 1859 -- valid -- tuberculate emarginula
  Enaeta cylleniformis (G. B. Sowerby I, 1844) -- valid -- sand lyria
  Engina caribbaea Bartsch and Rehder, 1939 -- valid -- caribbean engina
  Engina turbinella (Kiener, 1835) -- valid -- white-spot engina
  Ensis directus Conrad, 1843 -- valid -- atlantic jackknife clam, Atlantic jackknife
  Ensis minor Dall, 1900 -- valid -- minor jackknife clam, minor jackknife
  Ensis myrae S. S. Berry, 1953 -- valid -- california jackknife clam, California jackknife
  Ensitellops pilsbryi (Dall, 1899) -- valid -- pilsbry sportella
  Ensitellops protexta (Conrad, 1841) -- valid -- textured sportella
  Ensitellops tabula Olsson and Harbison, 1953 -- valid -- tube sportella
  Entalina platomodes Watson, 1879 -- valid -- verrill toothshell
  Entalinopsis callithrix (Dall, 1889) -- valid -- nine-side toothshell
  Entodesma beana (d'Orbigny, 1842) -- valid -- pearly entodesma
  Entodesma pictum (G. B. Sowerby I, 1834) -- valid -- painted entodesma, thin entodesma
  Entodesma saxicola (Baird, 1863) -- valid -- rock entodesma
  Entovalva perrieri (Malard, 1903) -- valid -- perrier montacutid, leptosynapta montacutid
  Eobania vermiculata (Muller, 1774) -- valid -- chocolate-band snail
  Epicynia inornata (d'Orbigny, 1842) -- valid -- hairy vitrinella
  Epicynia multicarinata (Dall, 1889) -- valid -- fringed vitrinella
  Epilucina californica (Conrad, 1837) -- valid -- California lucine
  Epioblasma arcaeformis (Lea, 1831) -- valid -- sugarspoon
  Epioblasma biemarginata (Lea, 1857) -- valid -- angled riffleshell
  Epioblasma brevidens (Lea, 1831) -- valid -- Cumberlandian combshell
  Epioblasma capsaeformis (Lea, 1834) -- valid -- oyster mussel
  Epioblasma flexuosa (Rafinesque, 1820) -- valid -- leafshell
  Epioblasma florentina florentina (Lea, 1857) -- invalid -- yellow blossom, yellow blossom pearly mussel
  Epioblasma florentina walkeri (Wilson & H. W. Clark, 1914) -- invalid -- tan riffleshell
  Epioblasma haysiana (Lea, 1834) -- valid -- acornshell
  Epioblasma lenior (Lea, 1842) -- valid -- narrow catspaw
  Epioblasma lewisii (Walker, 1910) -- valid -- forkshell
  Epioblasma metastriata (Conrad, 1838) -- valid -- upland combshell
  Epioblasma obliquata obliquata (Rafinesque, 1820) -- invalid -- purple cat's paw pearly mussel, catspaw
  Epioblasma obliquata perobliqua (Conrad, 1836) -- invalid -- white cat's paw pearly mussel, white catspaw
  Epioblasma othcaloogensis (Lea, 1857) -- valid -- southern acornshell
  Epioblasma penita (Conrad, 1834) -- valid -- penitent mussel, southern combshell
  Epioblasma personata (Say, 1829) -- valid -- round combshell
  Epioblasma propinqua (Lea, 1857) -- valid -- Tennessee riffleshell
  Epioblasma sampsonii (Lea, 1862) -- valid -- Wabash riffleshell
  Epioblasma stewardsonii (Lea, 1852) -- valid -- Cumberland leafshell
  Epioblasma torulosa gubernaculum (Reeve, 1865) -- invalid -- green blossom, green-blossom pearly mussel
  Epioblasma torulosa rangiana (Lea, 1838) -- invalid -- northern riffleshell
  Epioblasma torulosa torulosa (Rafinesque, 1820) -- invalid -- tubercled blossom, tubercled blossom pearly mussel
  Epioblasma triquetra (Rafinesque, 1820) -- valid -- snuffbox
  Epioblasma turgidula (Lea, 1858) -- valid -- turgid blossom, turgid blossom pearly mussel
  Episiphon didymus (Watson, 1879) -- valid -- ovate tuskshell
  Episiphon sowerbyi (Guilding, 1834) -- valid -- annulate tuskshell
  Epitonium albidum (d'Orbigny, 1842) -- valid -- bladed wentletrap
  Epitonium angulatum (Say, 1830) -- valid -- angulate wentletrap
  Epitonium apiculatum (Dall, 1889) -- valid -- semismooth wentletrap
  Epitonium babylonia (Dall, 1889) -- valid -- tower wentletrap
  Epitonium denticulatum (G. B. Sowerby II, 1844) -- valid -- tooth-rib wentletrap
  Epitonium echinaticosta (d'Orbigny, 1842) -- valid -- wide-coil wentletrap
  Epitonium foliaceicosta (d'Orbigny, 1842) -- valid -- wrinkle-rib wentletrap
  Epitonium fractum Dall, 1927 -- valid -- humble wentletrap
  Epitonium lamellosum (Lamarck, 1822) -- valid -- lamellose wentletrap
  Epitonium multistriatum (Say, 1826) -- valid -- many-ribbed wentletrap
  Epitonium novangliae (Couthouy, 1838) -- valid -- New England wentletrap
  Epitonium occidentale (Nyst, 1871) -- valid -- fine-ribbed wentletrap
  Epitonium rupicola (Kurtz, 1860) -- valid -- brown-band wentletrap
  Epitonium rushii (Dall, 1889) -- valid -- frosted wentletrap
  Epitonium sericifilum (Dall, 1889) -- valid -- silky wentletrap
  Epitonium unifasciatum (G. B. Sowerby II, 1844) -- valid -- one-band wentletrap
  Erato albescens Dall, 1905 -- valid -- whitish erato
  Erato columbella Menke, 1847 -- valid -- pigeon erato
  Erato maugeriae Gray, 1823 -- valid -- green erato
  Erato vitellina (Hinds, 1844) -- valid -- appleseed erato
  Ercolania coerulea Trinchese, 1893 -- valid -- blue stiliger
  Ercolania fuscata (Gould, 1870) -- valid -- dusky stiliger
  Eremarionta aquaealbae S. S. Berry, 1922 -- valid -- whitewater desertsnail
  Eremarionta brunnea (Willett, 1935) -- valid -- Chuckwalla Spring desertsnail
  Eremarionta greggi W. B. Miller, 1981 -- valid -- panamint desertsnail
  Eremarionta immaculata (Willett, 1937) -- valid -- white desertsnail
  Eremarionta indioensis (Yates, 1890) -- valid -- coachella desertsnail
  Eremarionta millepalmarum (S. S. Berry, 1930) -- valid -- Thousand Palms desertsnail
  Eremarionta morongoana (S. S. Berry, 1929) -- valid -- Morongo desertsnail
  Eremarionta orocopia (Willett, 1939) -- valid -- Orocopia desertsnail
  Eremarionta rowelli (Newcomb, 1865) -- valid -- eastern desertsnail
  Eremariontoides argus (Edson, 1912) -- valid -- Argus desertsnail
  Ersilia stancyki Waren, 1980 -- valid -- eastern brittlestar snail, brittlestar snail
  Ervilia concentrica (Holmes, 1860) -- valid -- concentric ervilia
  Ervilia nitens (Montagu, 1808) -- valid -- shining ervilia
  Ervilia subcancellata E. A. Smith, 1885 -- valid -- subcancellate ervilia
  Erycina balliana Dall, 1916 -- valid -- ball erycina
  Erycina coronata Dall, 1916 -- valid -- crown erycina
  Erycina emmonsi Dall, 1899 -- valid -- emmons erycina, rectangular erycina
  Erycina linella Dall, 1899 -- valid -- lined erycina
  Erycina periscopiana Dall, 1899 -- valid -- periscope erycina
  Eubranchus exiguus (Alder and Hancock, 1848) -- valid -- balloon aeolis, dwarf balloon aeolis
  Eubranchus misakiensis Baba, 1960 -- valid -- Misaki balloon aeolis
  Eubranchus olivaceus (O'Donoghue, 1922) -- valid -- green balloon aeolis
  Eubranchus rustyus (Er. Marcus, 1961) -- valid -- rustya aeolis
  Eubranchus tricolor Forbes, 1838 -- valid -- painted balloon aeolis
  Euchelus guttarosea Dall, 1889 -- valid -- red-spot topsnail
  Euchemotrema cheatumi (R. W. Fullington, 1974) -- valid -- palmetto pillsnail
  Euchemotrema fasciatum (Pilsbry, 1940) -- valid -- mountain pillsnail
  Euchemotrema fraternum (Say, 1824) -- valid -- upland pillsnail
  Euchemotrema hubrichti (Pilsbry, 1940) -- valid -- carinate pillsnail
  Euchemotrema leai (A. Binney, 1841) -- valid -- lowland pillsnail
  Euchemotrema wichitorum (Branson, 1972) -- valid -- wichita mountain pillsnail, Wichita Mountains pillsnail
  Euconulus chersinus (Say, 1821) -- valid -- wild hive
  Euconulus dentatus (Sterki, 1893) -- valid -- toothed hive
  Euconulus fulvus (Muller, 1774) -- valid -- brown hive
  Euconulus polygyratus (Pilsbry, 1899) -- valid -- fat hive
  Euconulus trochulus (Reinhardt, 1883) -- valid -- silk hive
  Eucrassatella fluctuata (Carpenter, 1864) -- valid -- wavy crassatella
  Eucrassatella speciosa (A. Adams, 1852) -- valid -- beautiful crassatella
  Eudolium crosseanum (di Monterosato, 1869) -- valid -- straw tun
  Eudolium thompsoni McGinty, 1955 -- valid -- mottled tun
  Euglandina rosea (Ferussac, 1818) -- valid -- rosey wolfsnail, rosy wolfsnail
  Euglandina singleyana (W. G. Binney, 1892) -- valid -- striate wolfsnail
  Euglandina texasiana (Pfeiffer, 1857) -- valid -- glossy wolfsnail
  Eulima fulvocincta C. B. Adams, 1850 -- valid -- brown-varice eulima
  Eulimostraca hemphilli -- valid -- brown eulima
  Eulimostraca subcarinata (d'Orbigny, 1842) -- valid -- brown-line eulima
  Eupera cubensis (Prime, 1865) -- valid -- mottled fingernailclam
  Eupleura caudata (Say, 1822) -- valid -- thick-lip drill
  Eupleura sulcidentata Dall, 1890 -- valid -- sharp-rib drill
  Euspira heros (Say, 1822) -- valid -- northern moonsnail
  Euspira immaculata (Totten, 1835) -- valid -- immaculate moonsnail
  Euspira levicula (A. E. Verrill, 1880) -- valid -- lightweight moonsnail
  Euspira tenuis (Récluz, 1850) -- valid -- thin moonsnail
  Euspira triseriata (Say, 1826) -- valid -- spotted moonsnail
  Facelina bostoniensis (Couthouy, 1838) -- valid -- Boston facelina
  Facelina stearnsi Cockerell, 1901 -- valid -- scarlet-tip aeolis
  Fargoa dianthophila (H. W. Wells and M. J. Wells, 1961) -- valid -- serpulid odostome
  Fartulum occidentale (Bartsch, 1920) -- valid -- western caecum
  Fasciolaria lilium lilium G. Fischer, 1807 -- valid -- banded tulip
  Fasciolaria tulipa (Linnaeus, 1758) -- valid -- true tulip
  Favartia alveata (Kiener, 1842) -- valid -- frilly dwarf triton
  Favartia cellulosa (Conrad, 1846) -- valid -- pitted murex
  Favartia minirosea (Abbott, 1954) -- valid -- rosy drill
  Felaniella parilis (Conrad, 1848) -- valid -- equal diplodon
  Ferrissia fragilis (Tryon, 1863) -- invalid -- Fragile Ancylid
  Ferrissia hendersoni (Walker, 1908) -- invalid -- blackwater ancylid
  Ferrissia mcneili Walker, 1925 -- invalid -- hood ancylid
  Ferrissia parallela (Haldeman, 1841) -- invalid -- Oblong Ancylid
  Ferrissia rivularis (Say, 1817) -- valid -- Creeping Ancylid
  Ferrissia walkeri (Pilsbry and Ferriss, 1907) -- invalid -- cloche ancylid
  Ficus carolae Clench, 1945 -- valid -- slender figsnail
  Ficus communis Roding, 1798 -- valid -- Atlantic figsnail
  Finella barbarensis (Bartsch, 1911) -- valid -- Santa Barbara cerith
  Finella californica (Dall and Bartsch, 1901) -- valid -- California cerith
  Finella tenuisculpta (Carpenter, 1864) -- valid -- fine-sculpted cerith
  Fiona pinnata (Eschscholtz, 1831) -- valid -- fiona
  Fisherola nuttalli (Haldeman, 1841) -- valid -- Shortface Lanx
  Fissidentalium carduus (Dall, 1889) -- valid -- thistle tuskshell
  Fissidentalium floridense (J. B. Henderson, 1920) -- valid -- yellow tuskshell
  Fissidentalium megathyris (Dall, 1890) -- valid -- costate tuskshell
  Fissidentalium meridionale (Pilsbry and Sharp, 1897) -- valid -- meridian tuskshell
  Fissurella angusta (Gmelin, 1791) -- valid -- narrow keyhole limpet
  Fissurella barbadensis (Gmelin, 1791) -- valid -- Barbados keyhole limpet
  Fissurella fascicularis Lamarck, 1822 -- valid -- wobbly keyhole limpet
  Fissurella nodosa (Born, 1778) -- valid -- knobby keyhole limpet
  Fissurella punctata P. Fischer, 1857 -- valid -- punctate keyhole limpet
  Fissurella rosea (Gmelin, 1791) -- valid -- rosy keyhole limpet
  Fissurella volcano Reeve, 1849 -- valid -- volcano keyhole limpet
  Fissurellidea bimaculata Dall, 1871 -- valid -- two-spot keyhole limpet
  Fissurisepta granulata (Sequenza, 1863) -- valid -- granulate puncturella
  Fluminicola avernalis Pilsbry, 1935 -- invalid -- Moapa Pebblesnail
  Fluminicola columbiana Hemphill, 1899 -- invalid -- Columbia Pebblesnail
  Fluminicola erythopoma Pilsbry, 1899 -- invalid -- Ash Meadows Pebblesnail
  Fluminicola fuscus (Haldeman, 1847) -- valid -- Ashy Pebblesnail
  Fluminicola hindsi (Baird, 1863) -- invalid -- Vagrant Pebblesnail
  Fluminicola merriami Pilsbry and Beecher, 1892 -- invalid -- Pahranagat Pebblesnail
  Fluminicola minutissimus Pilsbry, 1907 -- valid -- Pixie Pebblesnail
  Fluminicola modoci Hannibal, 1912 -- valid -- Modoc Pebblesnail
  Fluminicola nevadensis Walker, 1916 -- invalid -- Cortez Hills Pebblesnail
  Fluminicola nuttallianus (Lea, 1838) -- valid -- Dusky Pebblesnail
  Fluminicola seminalis (Hinds, 1842) -- valid -- Nugget Pebblesnail
  Fluminicola turbiniformis (Tryon, 1865) -- valid -- Turban Pebblesnail
  Fluminicola virens (Lea, 1838) -- valid -- Olympia Pebblesnail
  Fontelicella californiensis Gregg and Taylor, 1965 -- invalid -- Laguna Mountain Springsnail
  Fontelicella deserta (Pilsbry, 1916) -- invalid -- Desert Springsnail
  Fontelicella hendersoni (Pilsbry, 1933) -- invalid -- Harney Lake Springsnail
  Fontelicella idahoensis (Pilsbry, 1933) -- invalid -- Idaho Springsnail
  Fontelicella intermedia (Tryon, 1865) -- invalid -- Crooked Creek Springsnail
  Fontelicella micrococcus (Pilsbry, 1893) -- invalid -- Oasis Valley Springsnail
  Fontelicella neomexicana (Pilsbry, 1916) -- invalid -- Socorro Springsnail
  Fontelicella pilsbryana (J. L. Baily and R. I. Baily, 1952) -- invalid -- Bear Lake Springsnail
  Fontelicella robusta (Walker, 1908) -- invalid -- Jackson Lake Springsnail
  Fontelicella stearnsiana (Pilsbry, 1899) -- invalid -- Yaqui Springsnail
  Fontigens cryptica Hubricht, 1963 -- valid -- Hidden Springsnail
  Fontigens holsingeri Hubricht, 1976 -- invalid -- Tapered Cavesnail
  Fontigens nickliniana (Lea, 1838) -- valid -- Watercress Snail
  Fontigens orolibas Hubricht, 1957 -- valid -- Blue Ridge Springsnail
  Fontigens tartarea Hubricht, 1963 -- valid -- Organ Cavesnail
  Fontigens turritella Hubricht, 1976 -- valid -- Greenbrier Cavesnail
  Fossaria bulimoides (Lea, 1841) -- invalid
  Fossaria cubensis (Pfeiffer, 1839) -- invalid -- Carib fossaria
  Fossaria cyclostoma (Walker, 1808) -- invalid -- bugle fossaria
  Fossaria dalli (F. C. Baker, 1907) -- invalid -- dusky fossaria
  Fossaria galbana (Say, 1825) -- invalid -- boreal fossaria
  Fossaria humilis (Say, 1822) -- invalid -- marsh fossaria
  Fossaria modicella (Say, 1825) -- invalid -- rock fossaria
  Fossaria obrussa (Say, 1825) -- invalid -- golden fossaria
  Fossaria parva (Lea, 1841) -- invalid -- pygmy fossaria
  Fossaria perpolita (Dall, 1905) -- invalid -- glossy fossaria
  Fossaria sonomaensis (Hemphill in Pilsbry and Ferriss, 1906) -- invalid -- Sonoma fossaria
  Fossaria tazewelliana (Wolf, 1870) -- invalid -- Tazwell fossaria
  Fossaria truncatula (Muller, 1774) -- invalid -- attenuate fossaria
  Fossarus bellus Dall, 1889 -- valid -- beautiful fossarus
  Fossarus compactus Dall, 1889 -- valid -- compact fossarus
  Fossarus elegans A. E. Verrill and S. Smith, 1882 -- valid -- elegant fossarus
  Frigidoalvania janmayeni (Friele, 1878) -- valid -- Jan Mayen alvania
  Fusconaia askewi (Marsh, 1896) -- valid -- Texas pigtoe
  Fusconaia barnesiana (Lea, 1838) -- invalid -- Tennessee pigtoe
  Fusconaia cerina (Conrad, 1838) -- valid -- gulf pigtoe, southern pigtoe
  Fusconaia cor (Conrad, 1834) -- valid -- shiny pigtoe
  Fusconaia cuneolus (Lea, 1840) -- valid -- finerayed pigtoe, fine-rayed pigtoe
  Fusconaia ebena (Lea, 1831) -- invalid -- ebonyshell
  Fusconaia escambia Clench & Turner, 1956 -- valid -- narrow pigtoe
  Fusconaia flava (Rafinesque, 1820) -- valid -- Wabash pigtoe
  Fusconaia lananensis (Frierson, 1901) -- valid -- triangle pigtoe
  Fusconaia masoni (Conrad, 1834) -- valid -- Atlantic pigtoe
  Fusconaia ozarkensis (Call, 1887) -- valid -- Ozark pigtoe
  Fusconaia subrotunda (Lea, 1831) -- valid -- long-solid, longsolid
  Fusconaia succissa (Lea, 1852) -- invalid -- purple pigtoe
  Fusinus aepynotus (Dall, 1889) -- valid -- graceful spindle
  Fusinus alcimus (Dall, 1889) -- valid -- stout spindle
  Fusinus amphiurgus (Dall, 1889) -- valid -- slender spindle
  Fusinus barbarensis (Trask, 1855) -- valid -- Santa Barbara spindle
  Fusinus benthalis (Dall, 1889) -- valid -- modest spinkle, modest spindle
  Fusinus couei (Petit de la Saussaye, 1853) -- valid -- Yucatan spindle
  Fusinus eucosmius (Dall, 1889) -- valid -- apricot spindle
  Fusinus helenae Bartsch, 1939 -- valid -- brown spindle
  Fusinus luteopictus (Dall, 1877) -- valid -- painted spindle
  Fusinus stegeri Lyons, 1978 -- valid -- ornamented spindle
  Fusitriton oregonensis (Redfield, 1848) -- valid -- Oregon triton
  Gadila fusiformis (Pilsbry and Sharp, 1898) -- valid -- fusiform toothshell
  Gadila hepburni (Dall, 1897) -- valid -- hepburn toothshell
  Gadila mayori (J. B. Henderson, 1920) -- valid -- mayor toothshell
  Gari californica (Conrad, 1849) -- valid -- California sunsetclam
  Gari fucata (Hinds, 1845) -- valid -- painted sunsetclam
  Gastrochaena hians (Gmelin, 1791) -- valid -- atlantic rocellaria, Atlantic gastrochaenid
  Gastrochaena ovata G. B. Sowerby I, 1834 -- valid -- ovate rocellaria, ovate gastrochaenid
  Gastrochaena stimpsoni Tryon, 1861 -- valid -- stimpson rocellaria, Stimpson gastrochaenid
  Gastrocopta abbreviata (Sterki, 1909) -- valid -- plains snaggletooth
  Gastrocopta armifera (Say, 1821) -- valid -- armed snaggletooth
  Gastrocopta ashmuni (Sterki, 1898) -- valid -- sluice snaggletooth
  Gastrocopta carnegiei (Sterki, 1916) -- valid -- Erie snaggletooth
  Gastrocopta clappi (Sterki, 1909) -- valid -- bluegrass snaggletooth
  Gastrocopta cochisensis (Pilsbry and Ferriss, 1910) -- valid -- Apache snaggletooth
  Gastrocopta contracta (Say, 1822) -- valid -- bottleneck snaggletooth
  Gastrocopta corticaria (Say, 1816) -- valid -- bark snaggletooth
  Gastrocopta cristata (Pilsbry and Vanatta, 1900) -- valid -- crested snaggletooth
  Gastrocopta dalliana (Sterki, 1898) -- valid -- shortneck snaggletooth
  Gastrocopta holzingeri (Sterki, 1889) -- valid -- lambda snaggletooth
  Gastrocopta pellucida (Pfeiffer, 1841) -- valid -- slim snaggletooth
  Gastrocopta pentodon (Say, 1822) -- valid -- comb snaggletooth
  Gastrocopta pilsbryana (Sterki, 1890) -- valid -- montane snaggletooth
  Gastrocopta procera (Gould, 1840) -- valid -- wing snaggletooth
  Gastrocopta prototypus (Pilsbry, 1899) -- valid -- Sonoran snaggletooth
  Gastrocopta quadridens Pilsbry, 1916 -- valid -- cross snaggletooth
  Gastrocopta riograndensis (Pilsbry, 1916) -- valid -- Rio Grande snaggletooth
  Gastrocopta riparia Pilsbry, 1916 -- valid -- Gulf Coast snaggletooth
  Gastrocopta ruidosensis (Cockerell, 1899) -- valid -- Ruidoso snaggletooth
  Gastrocopta rupicola (Say, 1821) -- valid -- tapered snaggletooth
  Gastrocopta similis (Sterki, 1909) -- valid -- Great Lakes snaggletooth
  Gastrocopta tappaniana (C. B. Adams, 1842) -- valid -- white snaggletooth
  Gastrodonta fonticula Wurtz, 1948 -- valid -- Appalachia bellytooth
  Gastrodonta interna (Say, 1822) -- valid -- brown bellytooth
  Gastropteron cinereum Dall, 1925 -- valid -- gray batwing seaslug
  Gastropteron pacificum Bergh, 1893 -- valid -- Pacific batwing seaslug
  Gastropteron rubrum (Rafinesque, 1814) -- valid -- batwing seaslug
  Gastropteron vespertilium Gosliner and Armes, 1984 -- valid -- flapping dingbat
  Gaza superba (Dall, 1881) -- valid -- superb gaza
  Gemma gemma (Totten, 1834) -- valid -- amethyst gemclam
  Geukensia demissa (Dillwyn, 1817) -- valid -- ribbed mussel, ribbed-mussel
  Gillia altilis (Lea, 1841) -- valid -- Buffalo Pebblesnail
  Glans carpenteri (Lamy, 1922) -- valid -- Carpenter carditid
  Glans dominguensis (d'Orbigny, 1842) -- valid -- Santo Domingo carditid
  Glaucus atlanticus Forster, 1777 -- valid -- blue glaucus
  Glebula rotundata (Lamarck, 1819) -- valid -- round pearlshell
  Globivenus callimorpha (Dall, 1902) -- valid -- lily venus
  Globivenus fordi (Yates, 1890) -- valid -- Ford venus
  Glycymeris americana (DeFrance, 1829) -- valid -- giant american bittersweet, giant bittersweet
  Glycymeris corteziana Dall, 1916 -- valid -- cortez bittersweet
  Glycymeris decussata (Linnaeus, 1758) -- valid -- decussate bittersweet
  Glycymeris pectinata (Gmelin, 1791) -- valid -- comb bittersweet
  Glycymeris septentrionalis (Middendorff, 1849) -- valid -- anorthern bittersweet, northern bittersweet
  Glycymeris spectralis Nicol, 1952 -- valid -- spectral bittersweet
  Glycymeris subobsoleta (Carpenter, 1864) -- valid -- california bittersweet
  Glycymeris subtilis (Nicol, 1956) -- valid -- bermuda bittersweet
  Glycymeris undata (Linnaeus, 1758) -- valid -- wavy bittersweet
  Glyphyalinia carolinensis (Cockerell, 1890) -- valid -- spiral mountain glyph
  Glyphyalinia clingmani (Dall, 1890) -- valid -- fragile glyph
  Glyphyalinia cryptomphala (G. H. Clapp, 1915) -- valid -- thin glyph
  Glyphyalinia cumberlandiana (G. H. Clapp, 1919) -- valid -- hill glyph
  Glyphyalinia floridana (Morrison, 1937) -- valid -- Ocala glyph
  Glyphyalinia indentata (Say, 1823) -- valid -- carved glyph
  Glyphyalinia junaluskana (Clench and Banks, 1932) -- valid -- dark glyph
  Glyphyalinia latebricola Hubricht, 1968 -- valid -- stone glyph
  Glyphyalinia lewisiana (G. H. Clapp, 1908) -- valid -- pale glyph
  Glyphyalinia luticola Hubricht, 1966 -- valid -- furrowed glyph
  Glyphyalinia ocoae Hubricht, 1978 -- valid -- blue-gray glyph
  Glyphyalinia pecki Hubricht, 1966 -- valid -- blind glyph
  Glyphyalinia pentadelphia (Pilsbry, 1900) -- valid -- pink glyph
  Glyphyalinia picea Hubricht, 1976 -- valid -- rust glyph
  Glyphyalinia praecox (H. B. Baker, 1930) -- valid -- brilliant glyph
  Glyphyalinia raderi (Dall, 1898) -- valid -- Maryland glyph
  Glyphyalinia rhoadsi (Pilsbry, 1899) -- valid -- sculpted glyph
  Glyphyalinia rimula Hubricht, 1968 -- valid -- tongued glyph
  Glyphyalinia roemeri (Pilsbry and Ferriss, 1906) -- valid -- pretty glyph
  Glyphyalinia sculptilis (Bland, 1858) -- valid -- suborb glyph
  Glyphyalinia specus Hubricht, 1965 -- valid -- hollow glyph
  Glyphyalinia umbilicata (Cockerell, 1893) -- valid -- Texas glyph
  Glyphyalinia vanattai (Pilsbry and Walker, 1902) -- valid -- honey glyph
  Glyphyalinia virginica (Morrison, 1937) -- valid -- depressed glyph
  Glyphyalinia wheatleyi (Bland, 1883) -- valid -- bright glyph
  Glyptostoma gabrielense Pilsbry, 1938 -- valid -- San Gabriel chestnut
  Glyptostoma newberryanum (W. G. Binney, 1858) -- valid -- San Diego chestnut
  Gonatus berryi Naef, 1923 -- valid -- Berry armhook squid
  Gonatus fabricii (Lichtenstein, 1818) -- valid -- boreoatlantic armhook squid
  Gonatus onyx Young, 1972 -- valid -- clawed armhook squid
  Gonatus oregonensis Jefferts, 1985 -- valid -- Oregon armhook squid
  Gonatus ursabrunae Jefferts, 1985 -- valid -- brown bear armhook squid
  Gonidea angulata (Lea, 1838) -- valid -- western ridged mussel
  Gouldia cerina (C. B. Adams, 1845) -- valid -- waxy gouldclam
  Granulina margaritula (Carpenter, 1857) -- valid -- pear-shaped marginella, pear marginella
  Granulina ovuliformis (d'Orbigny, 1841) -- valid -- teardrop marginella
  Graptacme calamus (Dall, 1889) -- valid -- reed tuskshell
  Graptacme eborea (Conrad, 1846) -- valid -- ivory tuskshell
  Graptacme inversa (Deshayes, 1826) -- valid -- turned tuskshell
  Graptacme perlonga (Dall, 1881) -- valid -- slender tuskshell
  Graptacme semipolita (Broderip and G. B. Sowerby I, 1829) -- valid -- half-smooth tuskshell
  Graptacme semistriolatum (Guilding, 1834) -- valid -- scratched tuskshell
  Gregariella chenui (Recluz, 1842) -- valid -- Chenu mussel
  Gregariella coralliophaga (Gmelin, 1791) -- valid -- coral-eating mussel
  Grippina californica Dall, 1912 -- valid -- California grippclam
  Guppya gundlachi (Pfeiffer, 1839) -- valid -- glossy granule
  Gyraulus circumstriatus (Tryon, 1866) -- valid -- Disc Gyro
  Gyraulus deflectus (Say, 1824) -- valid -- Flexed Gyro
  Gyraulus hornensis F. C. Baker, 1934 -- valid -- Tuba Gyro
  Gyraulus parvus (Say, 1817) -- valid -- Ash Gyro
  Gyrotoma excisa (Lea, 1843) -- valid -- Excised Slitshell
  Gyrotoma lewisii (Lea, 1869) -- valid -- Striate Slitshell
  Gyrotoma pagoda (Lea, 1845) -- valid -- Pagoda Slitshell
  Gyrotoma pumila (Lea, 1860) -- valid -- Ribbed Slitshell
  Gyrotoma pyramidata (Shuttleworth, 1845) -- valid -- Pyramid Slitshell
  Gyrotoma walkeri (H. H. Smith, 1924) -- valid -- Round Slitshell
  Hadoceras taylori Hershler and Longley, 1986 -- invalid -- Nymph Trumpet
  Halicardia flexuosa (A. E. Verrill and S. Smith, 1881) -- valid -- flexed verticord
  Haliotinella patinaria (Guppy, 1876) -- valid -- fingernail moonsnail
  Haliotis assimilis Dall, 1878 -- invalid -- threaded abalone
  Haliotis corrugata W. Wood, 1828 -- valid -- pink abalone, abulón amarillo
  Haliotis cracherodii Leach, 1814 -- valid -- black abalone, abulón negro
  Haliotis fulgens Philippi, 1845 -- valid -- green abalone, abulón azul
  Haliotis kamtschatkana Jonas, 1845 -- valid -- pinto abalone
  Haliotis rufescens Swainson, 1822 -- valid -- red abalone, abulón rojo
  Haliotis sorenseni Bartsch, 1940 -- valid -- white abalone
  Haliris aequacostata (Howard, 1950) -- valid -- even-ribbed verticord
  Halistrepta sulcata (Dall, 1904) -- valid -- sulcate spoonclam
  Halistylus pupoides (Carpenter, 1864) -- valid -- pupa halistyle
  Haloconcha minor Dall, 1919 -- valid -- lesser lacuna
  Haloconcha refleza (Dall, 1884) -- valid -- reflexed lacuna
  Halodakra salmonea (Carpenter, 1864) -- valid -- salmon bernard-clam, salmon bernardclam
  Halodakra subtrigona (Carpenter, 1857) -- valid -- subtrigonal bernard-clam, subtrigonal bernardclam
  Haminoea antillarum (d'Orbigny, 1841) -- valid -- Antilles glassy-bubble
  Haminoea elegans (J. E. Gray, 1825) -- valid -- elegant glassy-bubble
  Haminoea petitii (d'Orbigny, 1841) -- valid -- straight glassy-bubble
  Haminoea solitaria (Say, 1822) -- valid -- solitary glassy-bubble
  Haminoea succinea (Conrad, 1846) -- valid -- amber glassy-bubble
  Haminoea vesicula (Gould, 1855) -- valid -- blister glassy-bubble
  Haminoea virescens (G. B. Sowerby II, 1833) -- valid -- green glassy-bubble
  Hanleya hanleyi (Bean, 1844) -- valid -- eastern hanleya
  Haplotrema alameda Pilsbry, 1930 -- valid -- Alameda lancetooth
  Haplotrema caelatum (Mazyck, 1886) -- valid -- slotted lancetooth
  Haplotrema catalinense (Hemphill, 1890) -- valid -- Catalina lancetooth
  Haplotrema concavum (Say, 1821) -- valid -- gray-footed lancetooth, gray-foot lancetooth
  Haplotrema continentis H. B. Baker, 1930 -- valid -- grizzly lancetooth
  Haplotrema costatum A. G. Smith, 1957 -- valid -- costate lancetooth
  Haplotrema duranti (Newcomb, 1864) -- valid -- ribbed lancetooth
  Haplotrema keepi (Hemphill, 1890) -- valid -- glassy lancetooth
  Haplotrema kendeighi Webb, 1951 -- valid -- blue-footed lancetooth, blue-foot lancetooth
  Haplotrema minimum (Ancey, 1888) -- valid -- California lancetooth
  Haplotrema sportella (Gould, 1846) -- valid -- beaded lancetooth
  Haplotrema transfuga (Hemphill, 1892) -- valid -- striate lancetooth
  Haplotrema vancouverense (I. Lea, 1839) -- valid -- robust lancetooth
  Haplotrema voyanum (Newcomb, 1864) -- valid -- hooded lancetooth
  Hastula cinerea (Born, 1778) -- valid -- gray auger
  Hastula hastata (Gmelin, 1791) -- valid -- shiny auger
  Hawaiia alachuana (Dall, 1885) -- valid -- southeastern gem
  Hawaiia minuscula (A. Binney, 1841) -- valid -- minute gem
  Hawaiia neomexicana (Cockerell and Pilsbry, 1900) -- valid -- striate gem
  Hebetoncylus excentricus (Morelet, 1851) -- invalid -- Excentric Ancylid
  Heilprinia timessa (Dall, 1889) -- valid -- turnip spindle
  Heleobops docimus F. G. Thompson, 1968 -- valid -- Oolite Hydrobe
  Heliacus bisulcatus (d'Orbigny, 1842) -- valid -- beaded sundial
  Heliacus cylindricus (Gmelin, 1791) -- valid -- Atlantic cylinder sundial
  Helicella obvia (Menke, 1828) -- valid -- heath helicellid
  Helicina clappi Pilsbry, 1909 -- valid -- rainbow drop
  Helicodiscus aldrichianus (G. H. Clapp, 1907) -- valid -- burrowing coil
  Helicodiscus barri Hubricht, 1962 -- valid -- raccoon coil
  Helicodiscus bonamicus Hubricht, 1978 -- valid -- spiral coil
  Helicodiscus diadema Grimm, 1967 -- valid -- shaggy coil
  Helicodiscus eigenmanni Pilsbry, 1900 -- valid -- Mexican coil
  Helicodiscus enneodon Hubricht, 1967 -- valid -- bluff coil
  Helicodiscus fimbriatus Wetherby, 1881 -- valid -- fringed coil
  Helicodiscus hadenoecus Hubricht, 1962 -- valid -- cricket coil
  Helicodiscus hexodon Hubricht, 1966 -- valid -- toothy coil
  Helicodiscus inermis H. B. Baker, 1929 -- valid -- oldfield coil
  Helicodiscus lirellus Hubricht, 1975 -- valid -- rubble coil
  Helicodiscus multidens Hubricht, 1962 -- valid -- twilight coil
  Helicodiscus notius Hubricht, 1962 -- valid -- tight coil
  Helicodiscus nummus (Vanatta, 1899) -- valid -- wax coil
  Helicodiscus parallelus (Say, 1817) -- valid -- compound coil
  Helicodiscus punctatellus Morrison, 1942 -- valid -- punctate coil
  Helicodiscus salmonaceus Hemphill, 1890 -- valid -- salmon coil
  Helicodiscus saludensis (Morrison, 1937) -- valid -- corncob snail
  Helicodiscus shimeki Hubricht, 1962 -- valid -- temperate coil
  Helicodiscus singleyanus (Pilsbry, 1889) -- valid -- smooth coil
  Helicodiscus tridens (Morrison, 1935) -- valid -- crosstimbers coil
  Helicodiscus triodus Hubricht, 1958 -- valid -- tallus coil, talus coil
  Helisoma anceps (Menke, 1830) -- valid -- Two-ridge Ramshorn
  Helisoma newberryi (Lea, 1858) -- valid -- Great Basin Ramshorn
  Helix aperta Born, 1778 -- valid -- green gardensnail
  Helix aspersa Muller, 1774 -- valid -- brown gardensnail
  Helix pomatia Linnaeus, 1758 -- valid -- escargot
  Helminthoglypta allyniana (S. S. Berry, 1920) -- valid -- Sierra shoulderband
  Helminthoglypta allynsmithi Pilsbry, 1939 -- valid -- Merced Canyon shoulderband
  Helminthoglypta arrosa (W. G. Binney, 1858) -- valid -- bronze shoulderband
  Helminthoglypta ayresiana (Newcomb, 1861) -- valid -- San Miguel shoulderband
  Helminthoglypta benitoensis Lowe, 1930 -- valid -- Pinnacles shoulderband
  Helminthoglypta berryi Hanna, 1929 -- valid -- Tehachapi shoulderband
  Helminthoglypta californiensis (I. Lea, 1838) -- valid -- Point Pinos shoulderband
  Helminthoglypta callistoderma Pilsbry, 1917 -- valid -- Kern shoulderband
  Helminthoglypta carpenteri (Newcomb, 1861) -- valid -- san juaquin shoulderband, San Joaquin shoulderband
  Helminthoglypta caruthersi Willett, 1934 -- valid -- Morris Canyon shoulderband
  Helminthoglypta contracostae (Pilsbry, 1895) -- valid -- contracosta shoulderband
  Helminthoglypta crotalina S. S. Berry, 1928 -- valid -- sidewinder shoulderband
  Helminthoglypta cuyama Hanna and A. G. Smith, 1937 -- valid -- Cuyama shoulderband
  Helminthoglypta cuyamacensis (Bartsch, 1895) -- valid -- cuyamaca shoulderband
  Helminthoglypta cypreophila (W. G. Binney and Bland, 1869) -- valid -- foothill shoulderband
  Helminthoglypta diabloensis (J. G. Cooper, 1869) -- valid -- silky shoulderband
  Helminthoglypta dupetithouarsii (Deshayes, 1840) -- valid -- cypress shoulderband
  Helminthoglypta edwardsi Gregg and W. B. Miller, 1976 -- valid -- Pine Valley shoulderband
  Helminthoglypta euomphalodes S. S. Berry, 1938 -- valid -- Greenhorn shoulderband
  Helminthoglypta exarata (Pfeiffer, 1857) -- valid -- santa cruz shoulderband, San Lorenzo shoulderband
  Helminthoglypta expansilabris (Pilsbry, 1898) -- valid -- Mendocino shoulderband
  Helminthoglypta ferrissi Pilsbry, 1924 -- valid -- Kings shoulderband
  Helminthoglypta fieldi Pilsbry, 1930 -- valid -- surf shoulderband
  Helminthoglypta fisheri (Bartsch, 1904) -- valid -- Panamint shoulderband
  Helminthoglypta fontiphila Gregg, 1931 -- valid -- Soledad shoulderband
  Helminthoglypta graniticola S. S. Berry, 1926 -- valid -- granite shoulderband
  Helminthoglypta greggi Willett, 1931 -- valid -- mohave shoulderband, Mojave shoulderband
  Helminthoglypta hertleini Hanna and A. G. Smith, 1937 -- valid -- Oregon shoulderband
  Helminthoglypta inglesi S. S. Berry, 1938 -- valid -- horse meadows shoulderband, Sunday shoulderband
  Helminthoglypta isabella S. S. Berry, 1938 -- valid -- tyucca shoulderband, yucca shoulderband
  Helminthoglypta jaegeri S. S. Berry, 1928 -- valid -- Sweetwater shoulderband
  Helminthoglypta liodoma S. S. Berry, 1938 -- valid -- Cottonwood shoulderband
  Helminthoglypta micrometalleoides W. B. Miller, 1970 -- valid -- mimic shoulderband
  Helminthoglypta mohaveana S. S. Berry, 1927 -- valid -- Victorville shoulderband
  Helminthoglypta napaea S. S. Berry, 1938 -- valid -- bigtree shoulderband
  Helminthoglypta nickliniana (I. Lea, 1838) -- valid -- Coast Range shoulderband
  Helminthoglypta orina S. S. Berry, 1938 -- valid -- Breckenridge shoulderband
  Helminthoglypta petricola (S. S. Berry, 1916) -- valid -- Transverse Range shoulderband
  Helminthoglypta proles (Hemphill, 1892) -- valid -- Yosemite shoulderband
  Helminthoglypta reediana Willett, 1932 -- valid -- Lowe Canyon shoulderband
  Helminthoglypta sequoicola (J. G. Cooper, 1866) -- valid -- redwood shoulderband
  Helminthoglypta similans Hanna and A. G. Smith, 1937 -- valid -- Coalinga shoulderband
  Helminthoglypta sonoma Pilsbry, 1937 -- valid -- Sonoma shoulderband
  Helminthoglypta stageri Willett, 1938 -- valid -- paiute shoulderband, Erskine Creek shoulderband
  Helminthoglypta stiversiana (J. G. Cooper, 1876) -- valid -- Point Reyes shoulderband
  Helminthoglypta thermimontis S. S. Berry, 1953 -- valid -- coyote shoulderband, Anza shoulderband
  Helminthoglypta traskii (Newcomb, 1861) -- valid -- peninsular range shoulderband
  Helminthoglypta tudiculata (A. Binney, 1843) -- valid -- southern california shoulderband, southern shoulderband
  Helminthoglypta tularensis (Hemphill, 1892) -- valid -- Tulare shoulderband
  Helminthoglypta umbilicata (Pilsbry, 1898) -- valid -- Big Sur shoulderband
  Helminthoglypta walkeriana (Hemphill, 1911) -- valid -- Morro shoulderband
  Helminthoglypta waltoni Gregg and W. B. Miller, 1976 -- valid -- Laguna shoulderband
  Hemistena lata (Rafinesque, 1820) -- valid -- cracking pearlymussel, cracking pearly mussel
  Hemitoma emarginata (de Blainville, 1825) -- valid -- emarginate emarginula
  Hemitoma octoradiata (Gmelin, 1791) -- valid -- eight-rib emarginula
  Hemitrochus varians (Menke, 1829) -- valid -- seagrape snail
  Hemphillia burringtoni Pilsbry, 1948 -- valid -- keeled jumping slug, keeled jumping-slug
  Hemphillia camelus Pilsbry and Vanatta, 1897 -- valid -- pale jumping slug, pale jumping-slug
  Hemphillia danielsi Vanatta, 1914 -- valid -- marbled jumping slug, marbled jumping-slug
  Hemphillia dromedarius Branson, 1972 -- valid -- dromedary jumping slug, dromedary jumping-slug
  Hemphillia glandulosa Bland and W. G. Binney, 1872 -- valid -- warty jumping slug, warty jumping-slug
  Hemphillia malonei Pilsbry, 1917 -- valid -- malone jumping slug, Malone jumping-slug
  Hemphillia pantherina Branson, 1975 -- valid -- panther jumping slug, panther jumping-slug
  Hendersonia occulta (Say, 1831) -- valid -- cherrystone drop
  Here ricthofeni (Gabb, 1866) -- valid -- pit lucine
  Hermissenda crassicornis (Eschscholtz, 1831) -- valid -- hermissenda
  Hesperarion hemphilli (W. G. Binney, 1875) -- valid -- hemphill western slug, Hemphill westernslug
  Hesperarion niger (J. G. Cooper, 1872) -- valid -- black western slug, black westernslug
  Heterodonax bimaculatus (Linnaeus, 1758) -- valid -- false beanclam, false-bean
  Heterodonax pacificus (Conrad, 1837) -- valid -- pacific false beanclam, Pacific false-bean
  Hiatella arctica (Linnaeus, 1767) -- valid -- Arctic hiatella
  Hiatella azaria (Dall, 1881) -- valid -- dirt hiatella
  Hiatella pholadis (Linnaeus, 1771) -- valid -- hole-hugger hiatella
  Hiatella striata Fleuriau, 1802 -- valid -- striate hiatella
  Hipponix antiquatus (Linnaeus, 1767) -- valid -- white hoofsnail
  Hipponix subrufus (Lamarck, 1819) -- valid -- orange hoofsnail
  Hipponix tumens Carpenter, 1864 -- valid -- ribbed hoofsnail
  Hojeda inaguensis (Weinland, 1880) -- valid -- Keys mudcloak
  Holospira arizonensis Stearns, 1890 -- valid -- Arizona holospira
  Holospira bilamellata Dall, 1895 -- valid -- bilamellate holospira
  Holospira chiricahuana Pilsbry, 1905 -- valid -- Cave Creek holospira
  Holospira cockerelli Dall, 1897 -- valid -- Cockerell holospira
  Holospira crossei Dall, 1895 -- valid -- Cross holospira
  Holospira danielsi Pilsbry and Ferriss, 1915 -- valid -- strongrib holospira
  Holospira ferrissi Pilsbry, 1905 -- valid -- stocky holospira
  Holospira montivaga Pilsbry, 1946 -- valid -- vagabond holospira
  Holospira oritis Pilsbry and Cheatum, 1951 -- valid -- mountain holospira
  Holospira pityis Pilsbry and Cheatum, 1951 -- valid -- pinecone holospira
  Holospira regis Pilsbry and Cockerell, 1905 -- valid -- royal holospira
  Holospira tantalus Bartsch, 1906 -- valid -- teasing holospira
  Holospira whetstonensis Pilsbry and Ferriss, 1923 -- valid -- Whetstone holospira
  Holospira yucatanensis Bartsch, 1906 -- valid -- Bartsch holospira
  Homalopoma albidum (Dall, 1881) -- valid -- white dwarf-turban
  Homalopoma baculum (Carpenter, 1864) -- valid -- berry dwarf-turban
  Homalopoma indutum (Watson, 1879) -- valid -- two-faced dwarf-turban
  Homalopoma juanensis (Dall, 1919) -- valid -- northwest dwarf-turban
  Homalopoma luridum (Dall, 1885) -- valid -- dark dwarf-turban
  Homalopoma paucicostatum (Dall, 1871) -- valid -- few-ribbed dwarf-turban, few-rib dwarf-turban
  Homalopoma radiatum (Dall, 1918) -- valid -- rayed dwarf-turban
  Hopkinsia rosacea MacFarland, 1905 -- valid -- Hopkins rose
  Hoyia sheldoni (Pilsbry, 1890) -- valid -- storm hydrobe, Storm Ghostsnail
  Humboldtiana agavophila Pratt, 1971 -- valid -- agave threeband
  Humboldtiana cheatumi Pilsbry, 1935 -- valid -- Davis Mountain threeband
  Humboldtiana chisosensis Pilsbry, 1927 -- valid -- Chisos threeband
  Humboldtiana edithae Parodiz, 1954 -- valid -- boulder slide threeband
  Humboldtiana ferrissiana Pilsbry, 1928 -- valid -- Mitre Peak threeband
  Humboldtiana fullingtoni Cheatum, 1972 -- valid -- Capote threeband
  Humboldtiana hoegiana praesidii Pilsbry, 1939 -- valid -- San Carlos threeband
  Humboldtiana palmeri Clench and Rehder, 1930 -- valid -- Mt. Livermore threeband
  Humboldtiana texana Pilsbry, 1927 -- valid -- Stockton Plateau threeband
  Humboldtiana ultima Pilsbry, 1927 -- valid -- northern threeband
  Humilaria kennerleyi (Reeve, 1863) -- valid -- Kennerley's venus, Kennerley venus
  Huttonella bicolor (Hutton, 1834) -- valid -- two-tone gulella
  Huxleyia munita (Dall, 1898) -- valid -- minute nucinellid
  Hyalina pallida (Linnaeus, 1758) -- valid -- pallid marginella
  Hyalocylis striata (Rang, 1828) -- valid -- striate clio
  Hyalopyrgus aequicostatus (Pilsbry, 1890) -- invalid -- Smooth-rib Hydrobe
  Hyalopyrgus brevissimus (Pilsbry, 1890) -- invalid -- Regal Hydrobe
  Hydatina physis (Linnaeus, 1758) -- valid -- brown-line paper-bubble, brown-line paperbubble
  Hydrobia booneae Morrison, 1973 -- invalid -- Boone Hydrobe
  Hydrobia totteni Morrison, 1954 -- invalid -- Minute Hydrobe
  Hypselodoris californiensis (Bergh, 1879) -- valid -- California blue doris
  Hypselodoris edenticulata (White, 1952) -- valid -- florida regal doris
  Illex coindetii (Verany, 1839) -- valid -- southern shortfin squid
  Illex illecebrosus (Lesueur, 1821) -- valid -- northern shortfin squid
  Illex oxygonius Roper, Lu and Mangold, 1969 -- valid -- sharptail shortfin squid
  Io fluvialis (Say, 1825) -- valid -- Spiny Riversnail
  Iphigenia brasiliana (Lamarck, 1818) -- valid -- giant false coquina, giant coquina
  Irusella lamellifera (Conrad, 1837) -- valid -- lamellar venus
  Ischadium recurvum (Rafinesque, 1820) -- valid -- hooked mussel
  Ischnochiton erythronotus (C. B. Adams, 1845) -- valid -- multihued chiton
  Ischnochiton hartmeyeri Thiele, 1910 -- valid -- multiringed chiton
  Ischnochiton pseudovirgatus Kaas, 1972 -- valid -- blue-spot chiton
  Isognomon alatus (Gmelin, 1791) -- valid -- flat tree-oyster
  Isognomon bicolor (C. B. Adams, 1845) -- valid -- bicolored purse-oyster, bicolor purse-oyster
  Isognomon janus Carpenter, 1857 -- valid -- thin purse-oyster
  Isognomon radiatus (Anton, 1839) -- valid -- lister purse-oyster, radial purse-oyster
  Isorobitella trigonalis (Carpenter, 1857) -- valid -- trigonal montacutid
  Janthina exigua Lamarck, 1816 -- valid -- dwarf janthina
  Janthina janthina (Linnaeus, 1758) -- valid -- janthina
  Janthina pallida W. Thompson, 1840 -- valid -- pale janthina
  Japonactaeon pusillus (Forbes, 1843) -- valid -- miniature baby-bubble
  Jaspidella jaspidea (Gmelin, 1791) -- valid -- jasper dwarf olive
  Jorunna pardus Behrens and R. Henderson, 1981 -- valid -- leopard jorunna
  Jouannetia quillingi Turner, 1955 -- valid -- quilling piddock, spiny piddock
  Juga acutifilosa (Stearns, 1890) -- valid -- Topaz Juga
  Juga bulbosa (Gould, 1847) -- valid -- Bulb Juga
  Juga hemphilli (J. Henderson, 1935) -- valid -- Barren Juga
  Juga interioris (Goodrich, 1944) -- valid -- Smooth Juga
  Juga laurae (Goodrich, 1944) -- valid -- Oasis Juga
  Juga nigrina (Lea, 1856) -- valid -- Black Juga
  Juga occata (Hinds, 1844) -- valid -- Scalloped Juga
  Juga plicifera (Lea, 1838) -- valid -- Pleated Juga
  Juga silicula (Gould, 1847) -- valid -- Glassy Juga
  Katharina tunicata (W. Wood, 1815) -- valid -- black katy
  Kellia suborbicularis (Montagu, 1803) -- valid -- suborbicular kellyclam
  Lacteoluna selenina (Gould, 1848) -- valid -- moonlight mudcloak
  Lacuna carinata Gould, 1848 -- valid -- carinate lacuna
  Lacuna crassior (Montagu, 1803) -- valid -- thick lacuna
  Lacuna marmorata Dall, 1919 -- valid -- chink snail
  Lacuna pallidula (E. M. da Costa, 1778) -- valid -- pale lacuna
  Lacuna parva (E. M. da Costa, 1778) -- valid -- tiny lacuna
  Lacuna succinea S. S. Berry, 1953 -- valid -- amber lacuna
  Lacuna unifasciata Carpenter, 1856 -- valid -- one-band lacuna
  Lacuna vaginata (Dall, 1918) -- valid -- delightful lacuna
  Lacuna variegata Carpenter, 1864 -- valid -- variegate lacuna
  Lacuna vincta (Montagu, 1803) -- valid -- northern lacuna
  Laemodonta cubensis (Pfeiffer, 1854) -- valid -- Cuba dwarf pedipes
  Laevapex diaphanus (Haldeman, 1841) -- invalid -- cymbal ancylid
  Laevapex fuscus (C. B. Adams, 1841) -- valid -- Dusky Ancylid
  Laevapex peninsulae (Pilsbry, 1903) -- invalid -- peninsula ancylid
  Laevicardium elatum (G. B. Sowerby I, 1833) -- valid -- giant eggcockle
  Laevicardium laevigatum (Linnaeus, 1758) -- valid -- eggcockle
  Laevicardium mortoni (Conrad, 1830) -- valid -- morton eggcockle, yellow eggcockle
  Laevicardium pictum (Ravenel, 1861) -- valid -- painted eggcockle
  Laevicardium substriatum (Conrad, 1837) -- valid -- Pacific eggcockle
  Laevicardium sybariticum (Dall, 1886) -- valid -- delicate eggcockle
  Laevicaulis alte (Ferussac, 1821) -- valid -- tropical leatherleaf
  Laevidentalium callipeplum (Dall, 1889) -- valid -- gorgeous tuskshell
  Laevinesta atlantica (Perez Farfante, 1947) -- valid -- Atlantic nesta
  Lamellaria diegoensis Dall, 1885 -- valid -- San Diego lamellaria
  Lamellaria leucosphaera Schwengel, 1942 -- valid -- white-ball lamellaria
  Lamellaria pellucida Verrill, 1880 -- valid -- transluscent lamellaria
  Lamellaria perspicua (Linnaeus, 1758) -- valid -- transparent lamellaria
  Lamellaxis clavulinus (Potiez and Michaud, 1838) -- valid -- spike awlsnail
  Lamellaxis gracilis (Hutton, 1834) -- valid -- graceful awlsnail
  Lamellaxis mauritianus (Pfeiffer, 1952) -- valid -- mauritian awlsnail
  Lamellaxis micra (d'Orbigny, 1835) -- valid -- tiny awlsnail
  Lamellidoris fusca (Muller, 1776) -- valid -- barnacle-eating onchidoris
  Lamellidoris muricata (Muller, 1776) -- valid -- fuzzy onchidoris
  Lampsilis abrupta (Say, 1831) -- valid -- pink mucket
  Lampsilis altilis (Conrad, 1834) -- invalid -- finelined pocketbook
  Lampsilis australis Simpson, 1900 -- invalid -- southern sandshell
  Lampsilis binominata Simpson, 1900 -- valid -- lined pocketbook
  Lampsilis bracteata (Gould, 1855) -- valid -- Texas fatmucket
  Lampsilis cardium Rafinesque, 1820 -- valid -- plain pocketbook
  Lampsilis cariosa (Say, 1817) -- valid -- yellow lampmussel
  Lampsilis dolabraeformis (Lea, 1838) -- valid -- Altamaha pocketbook
  Lampsilis fasciola Rafinesque, 1820 -- valid -- wavy-rayed lampmussel, wavyrayed lampmussel
  Lampsilis fullerkati R. I. Johnson, 1984 -- invalid -- Waccamaw fatmucket
  Lampsilis haddletoni Athearn, 1964 -- invalid -- Haddleton lampmussel
  Lampsilis higginsii (Lea, 1857) -- valid -- Higgins' eye, Higgins' eye pearly mussel
  Lampsilis hydiana (Lea, 1838) -- valid -- Louisiana fatmucket
  Lampsilis ornata (Conrad, 1835) -- valid -- southern pocketbook
  Lampsilis ovata (Say, 1817) -- valid -- pocketbook
  Lampsilis perovalis (Conrad, 1834) -- invalid -- orange-nacre mucket, orangenacre mucket
  Lampsilis powellii (Lea, 1852) -- valid -- Arkansas fatmucket
  Lampsilis radiata conspicua (Lea, 1872) -- invalid
  Lampsilis radiata radiata (Gmelin, 1791) -- invalid -- eastern lampmussel
  Lampsilis rafinesqueana Frierson, 1927 -- valid -- Neosho mucket
  Lampsilis reeveiana brevicula (Call, 1887) -- invalid -- Ozark broken-ray
  Lampsilis reeveiana brittsi Simpson, 1900 -- invalid -- northern broken-ray
  Lampsilis reeveiana reeveiana (Lea, 1852) -- invalid -- Arkansas broken-ray
  Lampsilis satura (Lea, 1852) -- valid -- sandbank pocketbook
  Lampsilis siliquoidea (Barnes, 1823) -- valid -- fatmucket
  Lampsilis splendida (Lea, 1838) -- valid -- rayed pink fatmucket
  Lampsilis straminea claibornensis (Lea, 1838) -- invalid -- southern fatmucket
  Lampsilis straminea straminea (Conrad, 1834) -- invalid -- rough fatmucket
  Lampsilis streckeri Frierson, 1927 -- valid -- speckled pocketbook
  Lampsilis subangulata (Lea, 1840) -- invalid -- shiny-rayed pocketbook, shinyrayed pocketbook
  Lampsilis teres (Rafinesque, 1820) -- valid -- yellow sandshell
  Lampsilis virescens (Lea, 1858) -- valid -- Alabama lamp mussel, Alabama lamp pearly mussel, Alabama lampmussel
  Lanx alta (Tryon, 1865) -- valid -- Highcap Lanx
  Lanx klamathensis Hannibal, 1912 -- invalid -- Scale Lanx
  Lanx patelloides (Lea, 1856) -- valid -- Kneecap Lanx
  Lanx subrotunda (Tryon, 1865) -- invalid -- Rotund Lanx
  Lasaea adansoni (Gmelin, 1791) -- valid -- adanson lepton, reddish lepton
  Lasaea subviridis Dall, 1899 -- valid -- pacific lepton
  Lasmigona complanata alabamensis Clarke, 1985 -- invalid
  Lasmigona complanata complanata (Barnes, 1823) -- invalid -- white heelsplitter
  Lasmigona compressa (Lea, 1829) -- valid -- creek heelsplitter
  Lasmigona costata (Rafinesque, 1820) -- valid -- fluted-shell, flutedshell
  Lasmigona decorata (Lea, 1852) -- valid -- Carolina heelsplitter
  Lasmigona holstonia (Lea, 1838) -- valid -- Tennessee heelsplitter
  Lasmigona subviridis (Conrad, 1835) -- valid -- green floater
  Latiaxis costatus (Blainville, 1832) -- valid -- california coralsnail
  Latirus angulatus (Roding, 1798) -- valid -- short-tail latirus
  Latirus carinifer Lamarck, 1822 -- valid -- yellow latirus
  Latirus infundibulum (Gmelin, 1791) -- valid -- brown-line latirus
  Latirus nematus Woodring, 1928 -- valid -- threaded latirus
  Leidyula floridana (Leidy, 1851) -- valid -- Florida leatherleaf
  Leidyula kraussi (Ferussac, 1823) -- valid -- dappled leatherleaf
  Leidyula moreleti (Crosse and P. Fischer, 1872) -- valid -- tan leatherleaf
  Leidyula sloani (Cuvier, 1816) -- valid -- sloan leatherleaf
  Leiomya claviculata (Dall, 1881) -- valid -- clavicle myoneria
  Lemiox rimosus (Rafinesque, 1831) -- valid -- birdwing pearlymussel, birdwing pearly mussel
  Lepeta alba (Dall, 1869) -- valid -- white blind limpet
  Lepeta caeca (Muller, 1776) -- valid -- northern blind limpet
  Lepeta caecoides Carpenter, 1865 -- valid -- dead-end blind limpet
  Lepeta concentrica Middendorff, 1851 -- valid -- ringed blind limpet
  Lepidochitona liozonis (Dall and Simpson, 1901) -- valid -- Caribbean red chiton
  Leporimetis intastriata (Say, 1827) -- valid -- atlantic fat tellin, Atlantic fat-tellin
  Leporimetis obesa (Deshayes, 1855) -- valid -- california fat tellin, California fat-tellin
  Leptaxinus minutus A. E. Verrill and Bush, 1898 -- valid -- minute axinopsid
  Leptodea fragilis (Rafinesque, 1820) -- invalid -- fragile papershell
  Leptodea leptodon (Rafinesque, 1820) -- invalid -- scaleshell
  Leptodea ochracea (Say, 1817) -- invalid -- tidewater mucket
  Lepton lepidum Say, 1826 -- valid -- graceful lepton
  Leptopecten latiauratus (Conrad, 1837) -- valid -- kelp scallop
  Leptoxis ampla (Anthony, 1855) -- valid -- Round Rocksnail
  Leptoxis arkansensis (Hinkley, 1915) -- valid -- Arkansas Mudalia
  Leptoxis carinata (Bruguiere, 1792) -- valid -- Crested Mudalia
  Leptoxis clipeata (H. H. Smith in Goodrich, 1922) -- valid -- Agate Rocksnail
  Leptoxis compacta (Anthony, 1854) -- valid -- Oblong Rocksnail
  Leptoxis crassa (Haldeman, 1841) -- invalid -- boulder snail, boulder riversnail
  Leptoxis dilatata (Conrad, 1835) -- valid -- Seep Mudalia
  Leptoxis foremani (Lea, 1843) -- valid -- Interrupted Rocksnail
  Leptoxis formosa (Lea, 1860) -- valid -- Maiden Rocksnail
  Leptoxis ligata (Anthony, 1860) -- valid -- Rotund Rocksnail
  Leptoxis lirata (H. H. Smith in Goodrich, 1922) -- valid -- Lirate Rocksnail
  Leptoxis melanoides (Conrad, 1834) -- invalid -- black mudalia
  Leptoxis minor (Hinkley, 1912) -- valid -- Knob Mudalia
  Leptoxis occultata (H. H. Smith in Goodrich, 1922) -- valid -- Bigmouth Rocksnail
  Leptoxis picta (Conrad, 1834) -- valid -- Spotted Rocksnail
  Leptoxis plicata (Conrad, 1834) -- valid -- Plicate Rocksnail
  Leptoxis praerosa (Say, 1821) -- valid -- Onyx Rocksnail
  Leptoxis showalterii (Lea, 1860) -- valid -- Coosa Rocksnail
  Leptoxis taeniata (Conrad, 1834) -- invalid -- Painted Rocksnail
  Leptoxis trilineata (Say, 1829) -- valid -- Broad Mudalia
  Leptoxis umbilicata (Wetherby, 1876) -- valid -- Umbilicate Rocksnail
  Leptoxis virgata (Lea, 1841) -- valid -- Smooth Mudalia
  Leptoxis vittata (Lea, 1860) -- valid -- Striped Rocksnail
  Lepyrium showalteri (Lea, 1861) -- valid -- Flat Pebblesnail
  Leucozonia nassa (Gmelin, 1791) -- valid -- chestnut latirus
  Leucozonia ocellata (Gmelin, 1791) -- valid -- white-spot latirus
  Lexingtonia dolabelloides (Lea, 1840) -- invalid -- slabside pearly mussel
  Lexingtonia subplana (Conrad, 1837) -- invalid -- Virginia pigtoe
  Ligumia nasuta (Say, 1817) -- invalid -- eastern pondmussel
  Ligumia recta (Lamarck, 1819) -- valid -- black sandshell
  Ligumia subrostrata (Say, 1831) -- invalid -- pondmussel
  Liguus fasciatus (Muller, 1774) -- valid -- Florida treesnail
  Lima floridana Olsson and Harbison, 1953 -- valid -- smooth fileclam
  Lima lima (Linnaeus, 1758) -- valid -- spiny fileclam
  Lima locklini McGinty, 1955 -- valid -- locklin fileclam, skewed fileclam
  Lima pellucida C. B. Adams, 1846 -- valid -- antillean fileclam
  Lima scabra (Born, 1778) -- valid -- rough fileclam
  Lima subovata (Jeffreys, 1879) -- valid -- subovate fileclam
  Limacina bulimoides (d'Orbigny, 1836) -- valid -- bulimoid pteropod
  Limacina helicina (Phipps, 1774) -- valid -- helicid pteropod
  Limacina inflata (d'Orbigny, 1836) -- valid -- planorbid pteropod
  Limacina retroversa (Fleming, 1823) -- valid -- retrovert pteropod
  Limacina trochiformis (d'Orbigny, 1836) -- valid -- trochiform pteropod
  Limaria hemphilli (Hertlein and Strong, 1946) -- valid -- phemphill fileclam, Hemphill fileclam
  Limatula attenuata Dall, 1916 -- valid -- attenuate fileclam
  Limatula confusa (E. A. Smith, 1885) -- valid -- confusing fileclam
  Limatula hendersoni Olsson and McGinty, 1958 -- valid -- henderson fileclam, minute fileclam
  Limatula hyalina A. E. Verrill and Bush, 1898 -- valid -- ahyaline fileclam, hyaline fileclam
  Limatula hyperborea A. S. Jensen, 1909 -- valid -- boreal fileclam, Arctic fileclam
  Limatula regularis A. E. Verrill and Bush, 1898 -- valid -- aregular fileclam, regular fileclam
  Limatula saturna Bernard, 1978 -- valid -- saturnine fileclam, Saturna fileclam
  Limatula setifera Dall, 1886 -- valid -- bristly fileclam
  Limatula subauriculata (Montagu, 1808) -- valid -- small-ear fileclam
  Limatula vancouverensis Bernard, 1978 -- valid -- vancouver fileclam
  Limax flavus Linnaeus, 1758 -- valid -- yellow garden slug, yellow gardenslug
  Limax marginatus Muller, 1774 -- valid -- tree slug
  Limax maximus Linnaeus, 1758 -- valid -- giant garden slug, giant gardenslug
  Limax nyctelius Bourguignat, 1861 -- valid -- false tree slug, vine slug
  Limax valentianus Férussac, 1823 -- valid -- three-band garden slug
  Limea bronniana Dall, 1886 -- valid -- bronn fileclam, dwarf fileclam
  Limopsis akutanica Dall, 1916 -- valid -- Akutan limops
  Limopsis antillensis Dall, 1881 -- valid -- Antillean limops
  Limopsis aurita (Brocchi, 1814) -- valid -- eared limops
  Limopsis cristata Jeffreys, 1876 -- valid -- crested limops
  Limopsis diegensis Dall, 1908 -- valid -- san diego limops
  Limopsis minuta Philippi, 1836 -- valid -- minute limops
  Limopsis sulcata A. E. Verrill and Bush, 1898 -- valid -- asulcate limops, sulcate limops
  Linatella caudata (Gmelin, 1791) -- valid -- ringed triton
  Linga amiantus (Dall, 1886) -- valid -- miniature lucine
  Linga leucocyma Dall, 1886 -- valid -- four-rib lucine
  Linga pensylvanica (Linnaeus, 1758) -- valid -- pennsylvania lucine
  Linga sombrerensis (Dall, 1886) -- valid -- sombrero lucine
  Lioberus castaneus (Say, 1822) -- valid -- chestnut mussel
  Liocyma fluctuosum (Gould, 1841) -- valid -- wavy liocyma, varnished liocyma
  Liocyma viride Dall, 1871 -- invalid -- green liocyma
  Liomesus nassula Dall, 1901 -- valid -- basket whelk
  Lioplax cyclostomaformis (Lea, 1841) -- valid -- Cylindrical Lioplax
  Lioplax pilsbryi Walker, 1905 -- valid -- Choctaw Lioplax
  Lioplax subcarinata (Say, 1817) -- valid -- Ridgid Lioplax
  Lioplax sulculosa (Menke, 1827) -- valid -- furrowed lioplax
  Liotia fenestrata Carpenter, 1864 -- valid -- California cyclostreme
  Lirophora clenchi (Pulley, 1952) -- valid -- Clench venus, thick-ringed venus
  Lirularia acuticostata (Carpenter, 1864) -- valid -- sharp-rib lirularia
  Lirularia bicostata (J. H. McLean, 1964) -- valid -- two-rib margarite
  Lirularia discors J. H. McLean, 1984 -- valid -- incongruous lirularia
  Lirularia lirulata (Carpenter, 1864) -- valid -- lirulate margarite
  Lirularia optabilis (Carpenter, 1864) -- valid -- choice margarite
  Lirularia parcipicta (Carpenter, 1864) -- valid -- few-spotted lirularia, few-spot lirularia
  Lirularia succincta (Carpenter, 1864) -- valid -- girdled lirularia
  Lischkeia imperialis (Dall, 1881) -- valid -- imperial spiny margarite
  Lithasia armigera (Say, 1821) -- valid -- Armored Rocksnail
  Lithasia curta Lea, 1868 -- valid -- Knobby Rocksnail
  Lithasia duttoniana (Lea, 1841) -- valid -- Helmet Rocksnail
  Lithasia geniculata Haldeman, 1840 -- valid -- Ornate Rocksnail
  Lithasia hubrichti Clench, 1956 -- valid -- Big Black Rocksnail
  Lithasia jayana (Lea, 1841) -- valid -- Rugose Rocksnail
  Lithasia lima (Conrad, 1834) -- valid -- Warty Rocksnail
  Lithasia obovata (Say, 1829) -- valid -- Shawnee Rocksnail
  Lithasia salebrosa (Conrad, 1834) -- valid -- Muddy Rocksnail
  Lithasia verrucosa (Rafinesque, 1820) -- valid -- Varicose Rocksnail
  Lithophaga antillarum (d'Orbigny, 1842) -- valid -- giant datemussel
  Lithophaga aristata (Dillwyn, 1817) -- valid -- scissor datemussel
  Lithophaga bisulcata (d'Orbigny, 1842) -- valid -- mahogany datemussel
  Lithophaga nigra (d'Orbigny, 1842) -- valid -- black datemussel
  Lithophaga rogersi S. S. Berry, 1957 -- valid -- rogers datemussel
  Lithopoma americanum (Gmelin, 1791) -- valid -- american starsnail
  Lithopoma caelatum (Gmelin, 1791) -- valid -- carved starsnail
  Lithopoma gibberosa (Dillwyn, 1817) -- valid -- red turban
  Lithopoma tectum (Lightfoot, 1786) -- valid -- West Indian starsnail
  Lithopoma tuber (Linnaeus, 1767) -- valid -- green starsnail
  Litiopa melanostoma Rang, 1829 -- valid -- sargassum snail
  Littoridinops monroensis (Frauenfeld, 1863) -- valid -- Cockscomb Hydrobe
  Littoridinops palustris F. G. Thompson, 1968 -- valid -- Bantam Hydrobe
  Littoridinops tenuipes (Couper, 1844) -- valid -- Henscomb Hydrobe
  Littorina angulifera (Lamarck, 1822) -- valid -- mangrove periwinkle
  Littorina angustior (Morch, 1876) -- valid -- slender periwinkle
  Littorina irrorata (Say, 1822) -- valid -- marsh periwinkle
  Littorina keenae Rosewater, 1978 -- valid -- eroded periwinkle
  Littorina lineolata D'Orbigny, 1840 -- valid -- lineolate periwinkle
  Littorina littorea (Linnaeus, 1758) -- valid -- common periwinkle
  Littorina meleagris (Potiez and Michaud, 1838) -- valid -- white-spot periwinkle
  Littorina mespillum (Muhlfeld, 1824) -- valid -- brown periwinkle
  Littorina nebulosa (Lamarck, 1822) -- valid -- cloudy periwinkle
  Littorina neglecta Bean, 1844 -- valid -- obscure periwinkle
  Littorina obtusata (Linnaeus, 1758) -- valid -- yellow periwinkle
  Littorina saxatilis (Olivi, 1792) -- valid -- rough periwinkle
  Littorina scutulata Gould, 1849 -- valid -- checkered periwinkle
  Littorina sitkana Philippi, 1846 -- valid -- Sitka periwinkle
  Littorina ziczac (Gmelin, 1791) -- valid -- zebra periwinkle
  Loligo ocula Cohen, 1976 -- valid -- bigeye inshore squid
  Loligo opalescens Berry, 1911 -- valid -- california market squid, opalescent inshore squid
  Loligo pealeii Lesueur, 1821 -- valid -- longfin inshore squid
  Loligo plei Blainville, 1823 -- valid -- arrow squid, slender inshore squid
  Loligo roperi Cohen, 1976 -- valid -- roper squid, Roper inshore squid
  Lolliguncula brevis (Blainville, 1823) -- valid -- Atlantic brief squid
  Lolliguncula panamensis Berry, 1911 -- valid -- panama brief squid
  Lottia gigantea G. B. Sowerby I, 1834 -- valid -- owl limpet
  Lucapina aegis (Reeve, 1850) -- valid -- shield fleshy limpet
  Lucapina suffusa (Reeve, 1850) -- valid -- cancellate fleshy limpet
  Lucapinella callomarginata (Dall, 1871) -- valid -- rim fleshy limpet
  Lucapinella limatula (Reeve, 1850) -- valid -- file fleshy limpet
  Lucidella tantilla Pilsbry, 1902 -- valid -- ochre drop
  Lucina bermudensis Dall, 1901 -- valid -- bermuda lucine
  Lucina keenae Chavan, 1971 -- valid -- dosinia lucine
  Lucina muricata (Sprengler, 1798) -- valid -- spinose lucine
  Lucina nassula (Conrad, 1846) -- valid -- woven lucine
  Lucina nuttalli (Conrad, 1791) -- valid -- nuttall lucine
  Lucina pectinata (Gmelin, 1791) -- valid -- thick lucine
  Lucinoma aequizonatum (Stearns, 1890) -- valid -- equal-zone lucine
  Lucinoma annulatum (Reeve, 1850) -- valid -- ringed lucine, western ringed lucina
  Lucinoma blakeanum (Bush, 1893) -- valid -- Blake lucine
  Lucinoma filosa (Stimpson, 1851) -- valid -- northeast lucina, northeast lucine
  Lymnaea atkaensis Dall, 1884 -- valid -- Frigid Lymnaea
  Lymnaea stagnalis (Linnaeus, 1758) -- valid -- swamp lymnaea
  Lyonsia arenosa (Moller, 1842) -- valid -- sandy lyonsia
  Lyonsia bracteata (Gould, 1850) -- valid -- scaly lyonsia
  Lyonsia californica Conrad, 1837 -- valid -- California lyonsia, island lyonsia
  Lyonsia floridana Conrad, 1849 -- valid -- Florida lyonsia
  Lyonsia gouldii Dall, 1915 -- valid -- gould lyonsia
  Lyonsia granulifera A. E. Verrill and Bush, 1898 -- valid -- granulate lyonsia
  Lyonsia hyalina Conrad, 1831 -- valid -- glassy lyonsia
  Lyonsia pugetensis Dall, 1913 -- valid -- giant western lyonsia
  Lyonsia striata (Montagu, 1815) -- valid -- striate lyonsia
  Lyrodus pedicellatus (de Quatrefages, 1849) -- valid -- blacktip shipworm
  Lyropecten kallinubilosus (Bayer, 1943) -- valid -- clouded scallop
  Macoma acolasta Dall, 1921 -- valid -- morsel macoma
  Macoma baltica (Linnaeus, 1758) -- valid -- baltic macoma
  Macoma brevifrons (Say, 1834) -- valid -- short macoma
  Macoma brota Dall, 1916 -- valid -- heavy macoma
  Macoma calcarea (Gmelin, 1791) -- valid -- chalky macoma
  Macoma carlottensis Whiteaves, 1880 -- valid -- Charlotte macoma
  Macoma cerina C. B. Adams, 1845 -- valid -- waxy macoma
  Macoma constricta (Bruguiere, 1792) -- valid -- constricted macoma
  Macoma crassula (Deshayes, 1855) -- valid -- thick macoma
  Macoma dexioptera Baxter, 1977 -- valid -- rightwing macoma
  Macoma elimata Dunnill and Coan, 1968 -- valid -- file macoma, beveled macoma
  Macoma expansa Carpenter, 1864 -- valid -- expanded macoma
  Macoma extenuata Dall, 1900 -- valid -- slender macoma
  Macoma indentata Carpenter, 1864 -- valid -- indented macoma
  Macoma inquinata (Deshayes, 1855) -- valid -- stained macoma, pointed macoma
  Macoma lama Bartsch, 1929 -- valid -- Aleutian macoma
  Macoma leptonoidea Dall, 1895 -- valid -- lepton macoma
  Macoma limula Dall, 1895 -- valid -- little-file macoma
  Macoma lipara Dall, 1916 -- valid -- sleek macoma
  Macoma loveni (A. S. Jensen, 1905) -- valid -- loven macoma, inflated macoma
  Macoma middendorffi Dall, 1884 -- valid -- Middendorff macoma
  Macoma mitchelli Dall, 1895 -- valid -- mitchell macoma, Matagorda macoma
  Macoma moesta (Deshayes, 1855) -- valid -- flat macoma
  Macoma nasuta (Conrad, 1837) -- valid -- bent-nose macoma
  Macoma obliqua (J. Sowerby, 1817) -- valid -- oblique macoma, oval macoma
  Macoma phenax Dall, 1900 -- valid -- cheating macoma
  Macoma pseudomera Dall and Simpson, 1901 -- valid -- mera macoma
  Macoma pulleyi Boyer, 1969 -- valid -- pulley macoma, delta macoma
  Macoma secta (Conrad, 1837) -- valid -- white-sand macoma
  Macoma tageliformis Dall, 1900 -- valid -- tagelus macoma
  Macoma tenta (Say, 1834) -- valid -- elongate macoma
  Macoma yoldiformis Carpenter, 1864 -- valid -- yoldia macoma
  Macrocallista maculata (Linnaeus, 1758) -- valid -- calico clam
  Macrocallista nimbosa (Lightfoot, 1786) -- valid -- sunray venus
  Macromphalina californica Dall, 1903 -- valid -- california macromphaline
  Macromphalina floridana Moore, 1965 -- valid -- florida macromphaline
  Macromphalina palmalitoris Pilsbry and McGinty, 1950 -- valid -- palm beach macromphaline
  Macron lividus (A. Adams, 1855) -- valid -- livid macron
  Mactra californica Conrad, 1837 -- invalid -- California surfclam
  Mactra dolabriformis Conrad, 1867 -- invalid -- hatchet surfclam
  Mactra fragilis Gmelin, 1791 -- invalid -- fragile surfclam
  Mactra nasuta Gould, 1851 -- invalid -- bent surfclam
  Mactrellona alata (Sprengler, 1802) -- valid -- winged surfclam
  Mactromeris polynyma (Stimpson, 1860) -- valid -- Arctic surfclam
  Magnipelta mycophaga Pilsbry, 1953 -- valid -- spotted fungus slug, magnum mantleslug
  Malleus candeanus (d'Orbigny, 1842) -- valid -- Caribbean hammer-oyster
  Manzonia cosmia (Bartsch, 1911) -- valid -- cosmic alvania
  Manzonia purpurea (Dall, 1871) -- valid -- purple alvania
  Margarites althorpensis Dall, 1919 -- valid -- port althorp margarite
  Margarites costalis (Gould, 1841) -- valid -- boreal rosy margarite
  Margarites frigidus Dall, 1919 -- valid -- polar margarite
  Margarites giganteus (Leche, 1878) -- valid -- giant margarite
  Margarites groenlandicus (Gmelin, 1791) -- valid -- Greenland margarite
  Margarites helicinus (Phipps, 1774) -- valid -- spiral margarite
  Margarites multilineatus (DeKay, 1843) -- valid -- many-lined margarite, many-line margarite
  Margarites olivaceus (T. Brown, 1827) -- valid -- olive margarite
  Margarites pupillus (Gould, 1849) -- valid -- little margarite
  Margarites rhodia Dall, 1921 -- valid -- pacific rosy margarite
  Margarites salmoneus (Carpenter, 1864) -- valid -- salmon margarite
  Margarites simbla Dall, 1913 -- valid -- beehive margarite
  Margarites vorticifer (Dall, 1873) -- valid -- vortex margarite
  Margaritifera falcata (Gould, 1850) -- valid -- Western pearlshell
  Margaritifera hembeli (Conrad, 1838) -- valid -- Louisiana pearlshell
  Margaritifera margaritifera (Linnaeus, 1758) -- valid -- eastern pearlshell
  Margaritifera marrianae R. I. Johnson, 1983 -- valid -- Alabama pearlshell
  Marginella perexilis Bavay, 1922 -- valid -- gaunt marginella
  Marginella virginiana Conrad, 1868 -- valid -- virginia marginella
  Marisa cornuarietis (Linnaeus, 1758) -- valid -- giant rams-horn, Goldenhorn Marisa
  Marsenina ampla A. E. Verrill, 1880 -- valid -- great lamellaria
  Marsenina glabra (Couthouy, 1838) -- valid -- bald lamellaria
  Marsenina globosa L. M. Perry, 1939 -- valid -- rotund lamellaria
  Marsenina rhombica (Dall, 1871) -- valid -- rhombic lamellaria
  Marstonia agarhecta F. G. Thompson, 1969 -- valid -- Ocmulgee Marstonia
  Marstonia arga F. G. Thompson, 1977 -- valid -- Ghost Marstonia
  Marstonia castor F. G. Thompson, 1977 -- valid -- Beaverpond Marstonia
  Marstonia halcyon F. G. Thompson, 1977 -- valid -- Halcyon Marstonia
  Marstonia lustrica (Pilsbry, 1890) -- valid -- Boreal Marstonia
  Marstonia ogmorhaphe F. G. Thompson, 1977 -- valid -- Royal Marstonia, Royal Springsnail
  Marstonia olivacea (Pilsbry, 1895) -- valid -- Olive Marstonia
  Marstonia pachyta F. G. Thompson, 1977 -- valid -- Armored Marstonia
  Martesia cuneiformis (Say, 1822) -- valid -- wedge-shaped piddock, wedge piddock
  Martesia fragilis A. E. Verrill and Bush, 1890 -- valid -- fragile piddock
  Martesia striata (Linnaeus, 1758) -- valid -- striate piddock
  Mathilda barbadensis Dall, 1889 -- valid -- Barbados mathilda
  Mathilda yucatecana (Dall, 1881) -- valid -- Yucatan mathilda
  Maxwellia gemma (G. B. Sowerby II, 1879) -- valid -- gem murex
  Maxwellia santarosana (Dall, 1905) -- valid -- Santa Rosa murex
  Medionidus acutissimus (Lea, 1831) -- valid -- Alabama moccasinshell
  Medionidus conradicus (Lea, 1834) -- valid -- Cumberland moccasinshell
  Medionidus mcglameriae van der Schalie, 1939 -- invalid -- Tombigbee moccasinshell
  Medionidus parvulus (Lea, 1860) -- valid -- Coosa moccasinshell
  Medionidus penicillatus (Lea, 1857) -- valid -- Gulf moccasinshell
  Medionidus simpsonianus Walker, 1905 -- valid -- Ochlockonee moccasinshell
  Medionidus walkeri (S. H. Wright, 1897) -- valid -- Suwannee moccasinshell
  Megacrenella columbiana (Dall, 1897) -- valid -- british columbia crenella
  Megalonaias boykiniana (Lea, 1840) -- invalid -- round washboard
  Megalonaias nervosa (Rafinesque, 1820) -- valid -- washboard
  Megapallifera mutabilis (Hubricht, 1951) -- valid -- changeable mantleslug
  Megapallifera ragsdalei (Webb, 1950) -- valid -- Ozark mantleslug
  Megapallifera wetherbyi (W. G. Binney, 1874) -- valid -- blotchy mantleslug
  Megathura crenulata (G. B. Sowerby I, 1825) -- valid -- giant keyhole limpet
  Megomphix californicus A. G. Smith, 1960 -- valid -- Natural Bridge megomphix
  Megomphix hemphilli (W. G. Binney, 1879) -- valid -- Oregon megomphix
  Megomphix lutarius H. B. Baker, 1932 -- valid -- umatilla megomphix
  Meiocardia agassizii Dall, 1889 -- valid -- agassiz's ox-heart clam, ox-heart clam
  Melampus bidentatus Say, 1822 -- valid -- eastern melampus
  Melampus coffeus (Linnaeus, 1758) -- valid -- coffee melampus
  Melampus monile (Bruguiere, 1789) -- valid -- caribbean melampus
  Melampus olivaceus Carpenter, 1856 -- valid -- California melampus
  Melanella arcuata (C. B. Adams, 1850) -- valid -- twisted eulima
  Melanella catalinensis Bartsch, 1917 -- valid -- catalina eulima
  Melanella conoidea (Kurtz and Stimpson, 1851) -- valid -- conoidal eulima
  Melanella eulimoides (C. B. Adams, 1850) -- valid -- grooved eulima
  Melanella jamaicensis (C. B. Adams, 1845) -- valid -- Jamaica eulima
  Melanella montereyensis Bartsch, 1917 -- valid -- Monterey eulima
  Melanella peninsularis Bartsch, 1917 -- valid -- Baja eulima
  Melanella rutila (Carpenter, 1864) -- valid -- auburn eulima
  Melanella tacomaensis Bartsch, 1917 -- valid -- Tacoma eulima
  Melaniella gracillima (L. Pfeiffer, 1839) -- valid -- brown foxsnail
  Melanochlamys diomedea (Bergh, 1894) -- valid -- albatross aglaja
  Melanoides tuberculatus (Muller, 1774) -- valid -- red-rim melania
  Melanoides turriculus (I. Lea, 1850) -- valid -- fawn melania
  Melibe leonina (Gould, 1852) -- valid -- lion nudibranch
  Melongena corona (Gmelin, 1791) -- valid -- crown conch
  Menetus opercularis (Gould, 1847) -- valid -- Button Sprite
  Mercenaria campechiensis (Gmelin, 1791) -- valid -- southern quahog
  Mercenaria mercenaria (Linnaeus, 1758) -- valid -- northern quahog
  Mesodesma arctatum (Conrad, 1830) -- valid -- Arctic wedgeclam
  Mesodesma deauratum (Turton, 1822) -- valid -- gilded wedgeclam
  Mesodon andrewsae W. G. Binney, 1879 -- valid -- balsam globe
  Mesodon clausus (Say, 1821) -- valid -- yellow globelet
  Mesodon elevatus (Say, 1821) -- valid -- proud globe
  Mesodon mitchellianus (I. Lea, 1839) -- valid -- sealed globelet
  Mesodon normalis (Pilsbry, 1900) -- valid -- grand globe
  Mesodon sanus (Clench and Archer, 1933) -- valid -- squat globelet
  Mesodon thyroidus (Say, 1816) -- valid -- white-lip globe
  Mesodon zaletus (A. Binney, 1837) -- valid -- toothed globe
  Mesomphix andrewsae (Pilsbry, 1895) -- valid -- mountain button
  Mesomphix anurus Hubricht, 1962 -- valid -- frog button
  Mesomphix capnodes (W. G. Binney, 1857) -- valid -- dusky button
  Mesomphix cupreus (Rafinesque, 1831) -- valid -- copper button
  Mesomphix friabilis (W. G. Binney, 1857) -- valid -- brittle button
  Mesomphix globosus (MacMillan, 1940) -- valid -- globose button
  Mesomphix inornatus (Say, 1821) -- valid -- plain button
  Mesomphix latior (Pilsbry, 1900) -- valid -- broad button
  Mesomphix perfragilis (Wetherby, 1894) -- valid -- fragile button
  Mesomphix perlaevis (Pilsbry, 1900) -- valid -- smooth button
  Mesomphix pilsbryi (G. H. Clapp, 1904) -- valid -- striate button
  Mesomphix rugeli (W. G. Binney, 1879) -- valid -- wrinkled button
  Mesomphix subplanus (A. Binney, 1842) -- valid -- flat button
  Mesomphix vulgatus H. B. Baker, 1933 -- valid -- common button
  Metastoma goldfussi (Menke, 1847) -- valid -- new braunfels metastoma
  Metastoma hamiltoni Dall, 1897 -- valid -- hamilton metastoma
  Metastoma mesolia Pilsbry, 1912 -- valid -- widemouth metastoma
  Metastoma pasonis Dall, 1895 -- valid -- robust metastoma
  Metastoma riograndense Pilsbry, 1946 -- valid -- rio grande metastoma
  Metastoma roemeri (Pfeiffer, 1848) -- valid -- distorted metastoma
  Metzgeria californica Dall, 1903 -- valid -- California false spindle
  Metzgeria montereyana A. G. Smith and M. Gordon, 1948 -- valid -- Monterey false spindle
  Micrarionta facta (Newcomb, 1864) -- valid -- Santa Barbara islandsnail
  Micrarionta feralis (Hemphill, 1901) -- valid -- San Nicolas islandsnail
  Micrarionta gabbii (Newcomb, 1864) -- valid -- san clemente islandsnail
  Micrarionta opuntia Roth, 1975 -- valid -- pricklypear islandsnail
  Micrarionta rufocincta (Newcomb, 1864) -- valid -- Santa Catalina islandsnail
  Microceramus floridanus (Pilsbry, 1898) -- valid -- florida urocoptid
  Microceramus pontificus (Gould, 1848) -- valid -- pontiff urocoptid
  Microceramus texanus (Pilsbry, 1898) -- valid -- Texas urocoptid
  Microgaza rotella rotella Dall, 1881 -- valid -- dwarf gaza
  Microglyphis brevicula (Dall, 1902) -- valid -- short baby-bubble
  Microglyphis estuarina (Dall, 1908) -- valid -- estuarine baby-bubble
  Micromelo undatus (Bruguiere, 1792) -- valid -- miniature melo
  Microphysula cookei (Pilsbry, 1922) -- valid -- Vancouver snail
  Microphysula ingersolli (Bland, 1875) -- valid -- spruce snail
  Milax gagates (Draparnaud, 1801) -- valid -- jet greenhouse slug, greenhouse slug
  Milneria kelseyi Dall, 1916 -- valid -- kelsey pouch-clam, Kelsey pouchclam
  Milneria minima (Dall, 1871) -- valid -- tiny pouch-clam, tiny pouchclam
  Miodontiscus prolongatus (Carpenter, 1864) -- valid -- elongate carditid
  Mirachelus clinocnemus Quinn, 1979 -- valid -- stooped mirachelus
  Mirachelus corbis (Dall, 1889) -- valid -- basket mirachelus
  Mitra barbadensis (Gmelin, 1791) -- valid -- Barbados miter
  Mitra florida Gould, 1856 -- valid -- Florida miter
  Mitra fultoni E. A. Smith, 1892 -- valid -- pitted miter
  Mitra idae Melvill, 1893 -- valid -- half-pitted miter
  Mitra nodulosa (Gmelin, 1791) -- valid -- beaded miter
  Mitra straminea A. Adams, 1853 -- valid -- Gulf Stream miter
  Mitra swainsonii antillensis Dall, 1889 -- valid -- Antillean miter
  Mitrella argus D'Orbigny, 1842 -- valid -- argus dovesnail
  Mitrella aurantiaca (Dall, 1871) -- valid -- golden dovesnail
  Mitrella clementensis (Bartsch, 1927) -- valid -- San Clemente dovesnail
  Mitrella diaphana (A. E. Verrill, 1882) -- valid -- translucent dovesnail
  Mitrella lunata (Say, 1826) -- valid -- lunar dovesnail
  Mitrella lutulenta (Dall, 1919) -- valid -- muddy dovesnail
  Mitrella multilineata (Dall, 1889) -- valid -- brown-band dovesnail
  Mitrella nycteis (Duclos, 1846) -- valid -- fenestrate dovesnail
  Mitrella ocellata (Gmelin, 1791) -- valid -- white-spot dovesnail
  Mitrella permodesta (Dall, 1890) -- valid -- shy dovesnail
  Mitrella profundi (Dall, 1889) -- valid -- deepwater dovesnail
  Mitrella pura (A. E. Verrill, 1882) -- valid -- simple dovesnail
  Mitrella tuberosa (Carpenter, 1864) -- valid -- variegate dovesnail
  Modiolus americanus (Leach, 1815) -- valid -- American horsemussel
  Modiolus capax (Conrad, 1837) -- valid -- fat horsemussel
  Modiolus carpenteri Soot-Ryen, 1963 -- valid -- California horsemussel
  Modiolus eiseni Strong and Hertlein, 1937 -- valid -- eisen horsemussel
  Modiolus modiolus (Linnaeus, 1758) -- valid -- northern horsemussel
  Modiolus neglectus Soot-Ryen, 1955 -- valid -- neglected horsemussel
  Modiolus rectus (Conrad, 1837) -- valid -- straight horsemussel
  Modiolus sacculifer (S. S. Berry, 1953) -- valid -- bag horsemussel
  Modulus modulus (Linnaeus, 1758) -- valid -- buttonsnail
  Moelleria costulata (Moller, 1842) -- valid -- ribbed moelleria
  Mohavelix micrometalleus (S. S. Berry, 1930) -- valid -- el paso shoulderband
  Monacha cantiana (Montagu, 1803) -- valid -- Kentish gardensnail
  Monadenia churchi Hanna and A. G. Smith, 1933 -- valid -- Klamath sideband
  Monadenia circumcarinata (Stearns, 1879) -- valid -- keeled sideband
  Monadenia fidelis (J. E. Gray, 1834) -- valid -- Pacific sideband
  Monadenia hillebrandi (Newcomb, 1864) -- valid -- mariposa sideband
  Monadenia infumata (Gould, 1855) -- valid -- redwood sideband
  Monadenia mormonum (Pfeiffer, 1857) -- valid -- Sierra sideband
  Monadenia setosa Talmadge, 1952 -- valid -- Trinity bristlesnail
  Monadenia troglodytes Hanna and A. G. Smith, 1933 -- valid -- Shasta sideband
  Monadenia tuolumneana S. S. Berry, 1955 -- valid -- tuolumne sideband
  Montacuta dawsoni Jeffreys, 1864 -- valid -- dawson montacutid
  Montacuta limpida Dall, 1899 -- valid -- limpid montacutid
  Montacuta percompressa Dall, 1899 -- valid -- much-compressed montacutid
  Moroteuthis robusta (Verrill, 1876) -- valid -- robust clubhook squid
  Morum lamarcki (Deshayes, 1844) -- valid -- rose-mouth morum
  Morum oniscus (Linnaeus, 1767) -- valid -- Atlantic morum
  Mulinia cleryana (d'Orbigny, 1846) -- valid -- Clery surfclam
  Mulinia lateralis (Say, 1822) -- valid -- dwarf surfclam
  Murexiella glypta (M. Smith, 1938) -- valid -- carved murex
  Murexiella levicula (Dall, 1889) -- valid -- lightweight murex
  Muricopsis oxytata (M. Smith, 1938) -- valid -- hexagonal murex
  Musculista senhousia (Benson, 1842) -- valid -- senhouse mussel, green mussel
  Musculium lacustre (Muller, 1774) -- valid -- lake fingernailclam
  Musculium partumeium (Say, 1822) -- valid -- swamp fingernailclam
  Musculium securis (Prime, 1852) -- valid -- pond fingernailclam
  Musculium transversum (Say, 1829) -- valid -- long fingernailclam
  Musculus corrugatus (Stimpson, 1851) -- valid -- corrugate mussel
  Musculus cultellus (Deshayer, 1839) -- valid -- knife mussel
  Musculus discors (Linnaeus, 1767) -- valid -- discordant mussel
  Musculus lateralis (Say, 1822) -- valid -- lateral mussel
  Musculus marmoratus (Forbes, 1838) -- valid -- spotted mussel
  Musculus niger (J. E. Gray, 1824) -- valid -- black mussel
  Musculus pygmaeus Glynn, 1964 -- valid -- pygmy mussel
  Musculus taylori (Dall, 1897) -- valid -- taylor mussel
  Musculus vernicosus (Middendorff, 1849) -- valid -- varnished mussel
  Mya arenaria Linnaeus, 1758 -- valid -- softshell clam, softshell
  Mya profundior Grant and Gale, 1931 -- valid -- deep softshell clam
  Mya pseudoarenaria Schlesch, 1931 -- valid -- false softshell clam, false softshell
  Mya truncata Linnaeus, 1758 -- valid -- truncate softshell clam, truncate softshell
  Mya uzenensis Nomura and Zimbo, 1937 -- valid -- siberia softshell clam
  Myonera lamellifera (Dall, 1881) -- valid -- shingled myoneria, shingled myonera
  Myrtea compressa (Dall, 1881) -- valid -- compressed lucine
  Myrtea lens (A. E. Verrill and S. Smith, 1880) -- valid -- alens lucine, lens lucine
  Myrtea pristiphora Dall and Simpson, 1901 -- valid -- lamellate lucine
  Myrtea sagrinata (Dall, 1886) -- valid -- arrow lucine
  Mysella aleutica Dall, 1899 -- valid -- aleutian mysella
  Mysella beringensis (Dall, 1916) -- valid -- bering sea mysella
  Mysella casta (A. E. Verrill and Bush, 1898) -- valid -- pure mysella
  Mysella compressa (Dall, 1913) -- valid -- compressed mysella
  Mysella grippi (Dall, 1912) -- valid -- eliptical mysella
  Mysella moelleri (Morch, 1875) -- valid -- moeller mysella, dirty mysella
  Mysella ovata (Jeffreys, 1881) -- valid -- ovate mysella
  Mysella pedroana Dall, 1899 -- valid -- San Pedro mysella
  Mysella planata (Krause, 1885) -- valid -- flat mysella
  Mysella planulata (Stimpson, 1851) -- valid -- plate mysella
  Mysella striatula A. E. Verrill and Bush, 1898 -- valid -- scratched mysella
  Mysella triquetra (A. E. Verrill and Bush, 1898) -- valid -- triangular mysella
  Mysella tumida (Carpenter, 1864) -- valid -- robust mysella
  Mytilopsis leucophaeata (Conrad, 1831) -- valid -- dark falsemussel
  Mytilopsis sallei (Recluz, 1849) -- valid -- Santo Domingo falsemussel
  Mytilus californianus Conrad, 1837 -- valid -- California mussel
  Mytilus edulis Linnaeus, 1758 -- valid -- edible blue mussel, blue mussel
  Nassarina glypta (Bush, 1885) -- valid -- engraved dovesnail
  Nassarina minor (C. B. Adams, 1845) -- valid -- banded dovesnail
  Nassarina monilifera (Sowerby, 1844) -- valid -- many-spotted dovesnail
  Nassarina penicillata (Carpenter, 1864) -- valid -- penciled dovesnail
  Nassarius acutus (Say, 1822) -- valid -- sharp nassa
  Nassarius albus (Say, 1826) -- valid -- antilles nassa, white nassa
  Nassarius consensus (Ravenel, 1861) -- valid -- striate nassa
  Nassarius fossatus (Gould, 1850) -- valid -- channeled nassa
  Nassarius fraterculus (Dunker, 1860) -- valid -- Japanese nassa
  Nassarius hotessieri (d'Orbigny, 1845) -- valid -- miniature nassa
  Nassarius insculptus (Carpenter, 1864) -- valid -- smooth western nassa
  Nassarius mendicus mendicus (Gould, 1849) -- valid -- lean western nassa
  Nassarius perpinguis (Hinds, 1844) -- valid -- fat western nassa
  Nassarius rhinetes S. S. Berry, 1953 -- valid -- California nassa
  Nassarius scissuratus (Dall, 1889) -- valid -- carved nassa
  Nassarius vibex (Say, 1822) -- valid -- bruised nassa
  Natica castrensis Dall, 1889 -- valid -- netted moonsnail
  Natica livida Pfeiffer, 1840 -- valid -- livid moonsnail
  Natica marochiensis (Gmelin, 1791) -- valid -- Morocco moonsnail
  Natica sagraiana D'Orbigny, 1842 -- valid -- lined moonsnail
  Navanax aenigmaticus (Bergh, 1893) -- valid -- mysterious aglaja
  Navanax inermis (J. G. Cooper, 1863) -- valid -- California aglaja
  Neaeromya compressa (Dall, 1899) -- valid -- compressed montacutid
  Neaeromya floridana (Dall, 1899) -- valid -- giant montacutid
  Neaeromya rugifera (Carpenter, 1864) -- valid -- wrinkled montacutid
  Neilonela acinula (Dall, 1890) -- valid -- berry nutclam
  Neilonela quadrangularis (Dall, 1881) -- valid -- quadrangular malletclam
  Nemocardium centifilosum (Carpenter, 1864) -- valid -- hundred-line cockle
  Nemocardium peramabile (Dall, 1881) -- valid -- lovely micro-cockle
  Nemocardium tinctum (Dall, 1881) -- valid -- dyed micro-cockle
  Nemocardium transversum Rehder and Abbott, 1951 -- valid -- atransverse micro-cockle, transverse micro-cockle
  Neopycnodonte cochlear (Poli, 1795) -- valid -- deepsea oyster
  Neosimnia spelta capitia Cate, 1973 -- valid -- Keys simnia
  Neptunea lyrata decemcostata (Say, 1826) -- valid -- wrinkle whelk
  Neptunea lyrata lyrata (Gmelin, 1791) -- valid -- lyre whelk
  Neptunea pribiloffensis (Dall, 1919) -- valid -- Pribilof whelk
  Neptunea smirnia (Dall, 1919) -- valid -- smirnia whelk
  Neptunea tabulata (Baird, 1863) -- valid -- tabled whelk
  Neptunea ventricosa (Gmelin, 1791) -- valid -- fat whelk
  Neptunea vinosa (Dall, 1919) -- valid -- wine whelk
  Nerita fulgurans Gmelin, 1791 -- valid -- Antillean nerite
  Nerita peloronta Linnaeus, 1758 -- valid -- bleeding tooth
  Nerita tessellata Gmelin, 1791 -- valid -- checkered nerite
  Nerita versicolor Gmelin, 1791 -- valid -- four-tooth nerite
  Neritina reclivata (Say, 1822) -- valid -- Olive Nerite
  Neritina virginea (Linnaeus, 1758) -- valid -- Virgin Nerite
  Nesovitrea binneyana (E. S. Morse, 1864) -- valid -- blue glass
  Nesovitrea dalliana (Pilsbry and Simpson, 1889) -- valid -- depressed glass
  Nesovitrea electrina (Gould, 1841) -- valid -- amber glass
  Nesovitrea suzannae Pratt, 1978 -- valid -- live oak glass
  Netastoma japonicum (Yokoyama, 1920) -- valid -- northern rostrate piddock
  Netastoma rostratum (Valenciennes, 1846) -- valid -- rostrate piddock
  Neverita duplicata (Say, 1822) -- valid -- shark eye
  Neverita politiana (Dall, 1919) -- valid -- polished moonsnail
  Nipponotrophon lasius (Dall, 1919) -- valid -- sandpaper trophon
  Nipponotrophon scitulus (Dall, 1891) -- valid -- spiny trophon
  Niso aeglees Bush, 1885 -- valid -- brown-line niso
  Niso hipolitensis Bartsch, 1917 -- valid -- Hipolito niso
  Nitidella carinata Hinds, 1844 -- valid -- carinate dovesnail
  Nitidella gausapata Gould, 1850 -- valid -- shaggy dovesnail
  Nitidella laevigata (Linnaeus, 1758) -- valid -- smooth dovesnail
  Nitidella nitida (Lamarck, 1822) -- valid -- glossy dovesnail
  Nitidiscala caamanoi (Dall and Bartsch, 1910) -- valid -- tabulate wentletrap
  Nitidiscala californica (Dall, 1917) -- valid -- California wentletrap
  Nitidiscala indianorum (Carpenter, 1864) -- valid -- money wentletrap
  Nitidiscala tincta (Carpenter, 1864) -- valid -- tinted wentletrap
  Nodilittorina tuberculata (Menke, 1828) -- valid -- pricklywinkle
  Nodulotrophon dalli (Kobelt, 1878) -- valid -- crown trophon
  Noetia ponderosa (Say, 1822) -- valid -- ponderous ark
  Norrisia norrisi (G. B. Sowerby II, 1838) -- valid -- norrissnail
  Notoacmea dipicta (Hinds, 1842) -- valid -- painted limpet
  Notoacmea fenestrata (Reeve, 1855) -- valid -- fenestrate limpet
  Notoacmea insessa (Hinds, 1842) -- valid -- seaweed limpet
  Notoacmea paleacea (Gould, 1853) -- valid -- surfgrass limpet
  Notoacmea persona (Rathke, 1833) -- valid -- mask limpet
  Notoacmea scutum (Rathke, 1833) -- valid -- plate limpet
  Notoacmea testudinalis (Muller, 1776) -- valid -- plant limpet
  Notogillia sathon F. G. Thompson, 1969 -- valid -- Satyr Siltsnail
  Notogillia wetherbyi (Dall, 1885) -- valid -- Alligator Siltsnail
  Nototeredo knoxi (Bartsch, 1917) -- valid -- knox shipworm, foliaceous shipworm
  Nototeredo norvagicus (Spengler, 1792) -- valid -- Norway shipworm
  Nucella canaliculata (Duclos, 1832) -- valid -- channeled dogwinkle
  Nucella emarginata (Deshayes, 1839) -- valid -- emarginate dogwinkle
  Nucella lamellosa (Gmelin, 1791) -- valid -- frilled dogwinkle
  Nucella lapillus (Linnaeus, 1758) -- valid -- Atlantic dogwinkle
  Nucella lima (Gmelin, 1791) -- valid -- file dogwinkle
  Nucula aegeensis Jeffreys, 1879 -- valid -- Aegean nutclam
  Nucula atacellana Schenck, 1939 -- valid -- cancellate nutclam
  Nucula calcicola Moore, 1977 -- valid -- reef nutclam
  Nucula crenulata A. Adams, 1856 -- valid -- crenulate nutclam
  Nucula delphinodonta Mighels and C. B. Adams, 1842 -- valid -- dolphintooth nutclam
  Nucula exigua G. B. Sowerby I, 1833 -- valid -- short nutclam, iridescent nutclam
  Nucula groenlandica Posselt, 1898 -- valid -- Greenland nutclam
  Nucula proxima Say, 1822 -- valid -- Atlantic nutclam
  Nuculana acuta (Conrad, 1832) -- valid -- pointed nutclam
  Nuculana amiata (Dall, 1916) -- valid -- rostrate nutclam
  Nuculana callimene (Dall, 1908) -- valid -- moon nutclam
  Nuculana carpenteri (Dall, 1881) -- valid -- carpenter nutclam, smooth nutclam
  Nuculana caudata (Donovan, 1801) -- valid -- tailed nutclam
  Nuculana cellulita (Dall, 1896) -- valid -- fine-lined nutclam
  Nuculana cestrota (Dall, 1889) -- valid -- hammer nutclam
  Nuculana concentrica (Say, 1824) -- valid -- concentric nutclam
  Nuculana hamata (Carpenter, 1864) -- valid -- hooked nutclam
  Nuculana jacksoni (Gould, 1841) -- valid -- jackson nutclam
  Nuculana jamaicensis (d'Orbigny, 1842) -- valid -- Jamaica nutclam
  Nuculana messanensis (Sequenza, 1877) -- valid -- messanean nutclam
  Nuculana minuta (Muller, 1776) -- valid -- minute nutclam
  Nuculana oxia (Dall, 1916) -- valid -- pacific nutclam
  Nuculana parva (G. B. Sowerby I, 1833) -- valid -- dwarf nutclam
  Nuculana penderi (Dall and Bartsch, 1910) -- valid -- pender nutclam, sharp-point nutclam
  Nuculana pernula (Müller, 1779) -- valid -- northern nutclam
  Nuculana radiata (Krause, 1885) -- valid -- rayed nutclam
  Nuculana spargana (Dall, 1916) -- valid -- san diego nutclam
  Nuculana subaequilatera (Jeffreys, 1879) -- valid -- unequal nutclam
  Nuculana taphria (Dall, 1896) -- valid -- furrowed nutclam
  Nuculana tenuisulcata (Couthouy, 1838) -- valid -- thin nutclam
  Nuculana verrilliana (Dall, 1886) -- valid -- verrill nutclam, barbed nutclam
  Nuttallia nuttallii (Conrad, 1837) -- valid -- mahogany clam, California mahogany-clam
  Nystiella atlantis Clench and Turner, 1952 -- valid -- atlantic wentletrap
  Nystiella concava (Dall, 1889) -- valid -- concave wentletrap
  Obliquaria reflexa Rafinesque, 1820 -- valid -- three-horn wartyback, threehorn wartyback
  Obovaria jacksoniana (Frierson, 1912) -- invalid -- southern hickorynut
  Obovaria olivaria (Rafinesque, 1820) -- valid -- hickorynut
  Obovaria retusa (Lamarck, 1819) -- valid -- golf stick pearly mussel, ring pink, ring pink mussel
  Obovaria rotulata (B. H. Wright, 1899) -- invalid -- round ebonyshell
  Obovaria subrotunda (Rafinesque, 1820) -- valid -- round hickorynut
  Obovaria unicolor (Lea, 1845) -- valid -- Alabama hickorynut
  Oceanida graduata de Folin, 1870 -- valid -- shouldered eulima
  Ocenebra atropurpurea Carpenter, 1865 -- valid -- purple rocksnail
  Ocenebra barbarensis (Gabb, 1865) -- valid -- santa barbara rocksnail
  Ocenebra beta (Dall, 1919) -- valid -- beta rocksnail
  Ocenebra circumtexta Stearns, 1871 -- valid -- circled rocksnail
  Ocenebra crispatissima S. S. Berry, 1953 -- valid -- curly rocksnail
  Ocenebra foveolata (Hinds, 1844) -- valid -- dim rocksnail
  Ocenebra gracillima Stearns, 1871 -- valid -- graceful rocksnail
  Ocenebra inornata (Recluz, 1851) -- valid -- japanese rocksnail
  Ocenebra lurida (Middendorff, 1848) -- valid -- lurid rocksnail
  Ocenebra minor Dall, 1919 -- valid -- minor rocksnail
  Ocenebra painei (Dall, 1903) -- valid -- ribbed rocksnail
  Ocenebra squamulifera (Carpenter and Gabb, 1869) -- valid -- scaly rocksnail
  Octopus bimaculatus Verrill, 1883 -- valid -- california two-spot octopus
  Octopus bimaculoides Pickford and McConnaughey, 1949 -- valid -- California two-spot octopus
  Octopus briareus Robson, 1929 -- valid -- Caribbean reef octopus
  Octopus burryi Voss, 1950 -- valid -- brownstripe octopus, Caribbean armstripe octopus
  Octopus californicus (Berry, 1911) -- valid -- orange bigeye octopus, North Pacific bigeye octopus
  Octopus defilippi Verany, 1851 -- valid -- longarm octopus, Atlantic longarm octopus
  Octopus digueti Perrier and Rochebrune, 1894 -- valid -- pacific pygmy octopus
  Octopus fitchi Berry, 1953 -- valid -- lilliput octopus
  Octopus joubini Robson, 1929 -- valid -- Atlantic pygmy octopus
  Octopus macropus Risso, 1826 -- valid -- Atlantic white-spotted octopus
  Octopus rubescens Berry, 1953 -- valid -- East Pacific red octopus
  Octopus vulgaris Cuvier, 1797 -- valid -- common octopus
  Okenia angelensis Lance, 1966 -- valid -- Angeles okenia
  Okenia plana Baba, 1960 -- valid -- flat okenia
  Okenia sapelona Ev. Marcus and Er. Marcus, 1967 -- valid -- Sapelo okenia
  Okenia vancouverensis (O'Donoghue, 1921) -- valid -- Vancouver okenia
  Olea hansineensis Agersborg, 1923 -- valid -- Hansine seaslug
  Oligyra orbiculata (Say, 1818) -- valid -- globular drop
  Oliva sayana Ravenel, 1834 -- valid -- lettered olive
  Olivella baetica Carpenter, 1864 -- valid -- beatic dwarf olive
  Olivella biplicata (G. B. Sowerby I, 1825) -- valid -- purple dwarf olive
  Olivella bullula (Reeve, 1850) -- valid -- bubble dwarf olive
  Olivella dealbata (Reeve, 1850) -- valid -- whitened dwarf olive
  Olivella floralia (Duclos, 1853) -- valid -- rice olive
  Olivella minuta (Link, 1807) -- valid -- minute dwarf olive
  Olivella mutica (Say, 1822) -- valid -- variable dwarf olive
  Olivella nivea (Gmelin, 1791) -- valid -- snowy dwarf olive
  Olivella pusilla (Marrat, 1871) -- valid -- tiny dwarf olive
  Omalogyra atomus (Philippi, 1841) -- valid -- atom snail
  Ommastrephes bartramii (Lesueur, 1821) -- valid -- red flying squid
  Onchidella borealis Dall, 1871 -- valid -- northwest onchidella
  Onchidella floridana (Dall, 1885) -- valid -- Florida onchidella
  Onchidiopsis glacialis (M. Sars, 1851) -- valid -- icy lamellaria
  Onchidiopsis kingmaruensis Russell, 1942 -- valid -- Baffin lamellaria
  Onoba aculeus (Gould, 1841) -- valid -- pointed cingula
  Onoba pelagica (Stimpson, 1851) -- valid -- carinate alvania
  Onobops crassus (F. G. Thompson, 1968) -- valid -- spartina hydrobe
  Onobops jacksoni (Bartsch, 1953) -- valid -- Fine-lined Hydrobe
  Onychoteuthis banksii (Leach, 1817) -- valid -- common clubhook squid
  Onychoteuthis borealijaponicus Okada, 1927 -- valid -- boreal clubhook squid
  Oocorys bartschi Rehder, 1943 -- valid -- giant false tun, giant false-tun
  Oocorys sulcata P. Fischer, 1883 -- valid -- sulcate false tun, sulcate false-tun
  Opalia aurifila (Dall, 1889) -- valid -- fine-mesh wentletrap
  Opalia borealis Keep, 1881 -- valid -- boreal wentletrap
  Opalia crenata (Linnaeus, 1758) -- valid -- coarse wentletrap
  Opalia eolis Clench and Turner, 1950 -- valid -- cancellate wentletrap
  Opalia funiculata (Carpenter, 1857) -- valid -- scalloped wentletrap
  Opalia hotessieriana (d'Orbigny, 1842) -- valid -- pitted wentletrap
  Opalia infrequens (C. B. Adams, 1852) -- valid -- sparse wentletrap
  Opalia montereyensis (Dall, 1907) -- valid -- Monterey wentletrap
  Opalia pumilio (Morch, 1874) -- valid -- dwarf wentletrap
  Opalia spongiosa (Carpenter, 1866) -- valid -- spongy wentletrap
  Opeas pumilum (Pfeiffer, 1840) -- valid -- dwarf awlsnail
  Opeas pyrgula Schmacker and Boettger, 1891 -- valid -- sharp awlsnail
  Oreohelix alpina (Elrod, 1901) -- valid -- alpine mountainsnail
  Oreohelix amariradix Pilsbry, 1934 -- valid -- Bitter Root mountainsnail
  Oreohelix anchana Gregg, 1953 -- valid -- Ancha mountainsnail
  Oreohelix barbata Pilsbry, 1905 -- valid -- bearded mountainsnail
  Oreohelix californica S. S. Berry, 1931 -- valid -- Clark mountainsnail
  Oreohelix carinifera Pilsbry, 1912 -- valid -- keeled mountainsnail
  Oreohelix concentrata (Dall, 1896) -- valid -- Huachuca mountainsnail
  Oreohelix confragosa Metcalf, 1974 -- valid -- Pinos Altos mountainsnail
  Oreohelix elrodi (Pilsbry, 1900) -- valid -- carinate mountainsnail
  Oreohelix eurekensis J. Henderson and Daniels, 1916 -- valid -- Eureka mountainsnail
  Oreohelix florida Pilsbry, 1939 -- valid -- florida mountainsnail
  Oreohelix grahamensis Gregg and W. B. Miller, 1974 -- valid -- Pinaleno mountainsnail
  Oreohelix handi Pilsbry and Ferriss, 1918 -- valid -- Spring mountainsnail
  Oreohelix haydeni (Gabb, 1869) -- valid -- lyrate mountainsnail
  Oreohelix hemphilli (Newcomb, 1869) -- valid -- Whitepine mountainsnail
  Oreohelix hendersoni Pilsbry, 1912 -- valid -- pallid mountainsnail
  Oreohelix houghi W. B. Marshall, 1929 -- valid -- Diablo mountainsnail
  Oreohelix howardi Jones, 1944 -- valid -- Mill Creek mountainsnail
  Oreohelix idahoensis (Newcomb, 1866) -- valid -- costate mountainsnail
  Oreohelix intersum (Hemphill, 1890) -- valid -- Deep Slide mountainsnail
  Oreohelix jaegeri S. S. Berry, 1931 -- valid -- Kyle Canyon mountainsnail
  Oreohelix jugalis (Hemphill, 1890) -- valid -- Boulder Pile mountainsnail
  Oreohelix junii Pilsbry, 1934 -- valid -- Grand Coulee mountainsnail
  Oreohelix litoralis Crews and Metcalf, 1982 -- valid -- san augustin mountainsnail
  Oreohelix magdalenae Pilsbry, 1939 -- valid -- Magdalena mountainsnail
  Oreohelix metcalfei Cockerell, 1905 -- valid -- Black Range mountainsnail
  Oreohelix nevadensis S. S. Berry, 1932 -- valid -- Schell Creek mountainsnail
  Oreohelix peripherica (Ancey, 1881) -- valid -- Deseret mountainsnail
  Oreohelix pilsbryi Ferriss, 1917 -- valid -- Mineral Creek mountainsnail
  Oreohelix pygmaea Pilsbry, 1913 -- valid -- pygmy mountainsnail
  Oreohelix socorroensis Pilsbry, 1905 -- valid -- Socorro mountainsnail
  Oreohelix strigosa (Gould, 1846) -- valid -- Rocky mountainsnail
  Oreohelix subrudis (Reeve, 1854) -- valid -- subalpine mountainsnail
  Oreohelix swopei Pilsbry and Ferriss, 1917 -- valid -- Morgan Creek mountainsnail
  Oreohelix tenuistriata J. Henderson and Daniels, 1916 -- valid -- thin-ribbed mountainsnail
  Oreohelix uinta Brooks, 1939 -- valid -- uinta mountainsnail
  Oreohelix vortex S. S. Berry, 1932 -- valid -- whorled mountainsnail
  Oreohelix waltoni Solem, 1975 -- valid -- lava rock mountainsnail
  Oreohelix yavapai Pilsbry, 1905 -- valid -- Yavapai mountainsnail
  Ornithoteuthis antillarum Adam, 1957 -- valid -- Atlantic bird squid
  Orobitella bakeri (Dall, 1916) -- valid -- baker montacutid
  Orthalicus floridensis Pilsbry, 1899 -- valid -- banded treesnail
  Orthalicus reses nesodryas Pilsbry, 1946 -- valid -- Florida Keys treesnail
  Orthalicus reses reses (Say, 1830) -- valid -- Stock Island treesnail
  Ostrea edulis Linnaeus, 1758 -- valid -- edible oyster
  Ostreola equestris (Say, 1834) -- invalid -- crested oyster
  Otala lactea (Muller, 1774) -- valid -- milk snail
  Oxychilus alliarius (J. S. Miller, 1822) -- valid -- garlic glass-snail
  Oxychilus cellarius (Muller, 1774) -- valid -- cellar glass-snail
  Oxychilus draparnaudi (Beck, 1837) -- valid -- dark-bodied glass-snail
  Oxychilus helveticus (Blum, 1881) -- valid -- Swiss glass-snail
  Oxyloma decampi (Tryon, 1866) -- valid -- Marshall ambersnail
  Oxyloma effusum (Pfeiffer, 1853) -- valid -- coastal plain ambersnail, coastal-plain ambersnail
  Oxyloma groenlandicum (Moller, 1842) -- valid -- ruddy ambersnail
  Oxyloma hawkinsi (Baird, 1863) -- valid -- boundary ambersnail
  Oxyloma haydeni (W. G. Binney, 1858) -- valid -- Niobrara ambersnail
  Oxyloma kanabense Pilsbry, 1948 -- valid -- Kanab ambersnail
  Oxyloma missoula Hubricht, 1982 -- valid -- Ninepipes ambersnail
  Oxyloma nuttallianum (I. Lea, 1841) -- valid -- oblique ambersnail
  Oxyloma peoriense (Wolf, 1894) -- valid -- depressed ambersnail
  Oxyloma retusum (I. Lea, 1834) -- valid -- blunt ambersnail
  Oxyloma salleanum (Pfeiffer, 1849) -- valid -- Louisiana ambersnail
  Oxyloma sillimani (Bland, 1865) -- valid -- Humboldt ambersnail
  Oxyloma subeffusum Pilsbry, 1948 -- valid -- Chesapeake ambersnail
  Oxynoe antillarum Morch, 1863 -- valid -- Antilles oxynoe
  Oxynoe azuropunctata K. R. Jensen, 1980 -- valid -- blue-spot oxynoe
  Pallifera dorsalis (A. Binney, 1842) -- valid -- pale mantleslug
  Pallifera fosteri F. C. Baker, 1939 -- valid -- Foster mantleslug
  Pallifera hemphilli (W. G. Binney, 1885) -- valid -- black mantleslug
  Pallifera marmorea Pilsbry, 1948 -- valid -- marbled mantleslug
  Pallifera ohioensis (Sterki, 1908) -- valid -- redfoot mantleslug
  Pallifera pilsbryi C. D. Miles and Mead, 1960 -- valid -- Arizona mantleslug
  Pallifera ragsdalei -- valid -- whiteface mantleslug
  Pallifera secreta (Cockerell, 1900) -- valid -- severed mantleslug
  Pallifera varia Hubricht, 1953 -- valid -- variable mantleslug
  Palliolum imbrifer (Loven, 1846) -- valid -- shingle scallop
  Palliolum leptaleum (Verrill, 1884) -- valid -- delicate scallop
  Palliolum reticulum (Dall, 1886) -- valid -- netted scallop
  Palliolum ringnesia -- valid -- ringnes scallop
  Palliolum striatum (Muller, 1776) -- valid -- striate scallop
  Palliolum undatum -- valid -- wavy scallop
  Panacca arata (A. E. Verrill and S. Smith, 1881) -- valid -- panacca clam
  Pandora arenosa Conrad, 1834 -- valid -- sandy pandora
  Pandora bilirata Conrad, 1855 -- valid -- bilirate pandora
  Pandora bushiana Dall, 1886 -- valid -- bush pandora, keeled pandora
  Pandora filosa (Carpenter, 1864) -- valid -- threaded pandora
  Pandora glacialis Leach, 1819 -- valid -- glacial pandora
  Pandora gouldiana Dall, 1886 -- valid -- gould pandora, rounded pandora
  Pandora inflata Boss and Merrill, 1965 -- valid -- inflated pandora
  Pandora inornata A. E. Verrill and Bush, 1898 -- valid -- inornate pandora
  Pandora punctata Conrad, 1837 -- valid -- punctate pandora
  Pandora trilineata Say, 1822 -- valid -- three-line pandora, threeline pandora
  Pandora wardiana A. Adams, 1859 -- valid -- ward pandora, giant pandora
  Panomya ampla Dall, 1898 -- valid -- ample roughmya
  Panomya beringiana Dall, 1916 -- valid -- bering roughmya
  Panopea abrupta (Conrad, 1849) -- valid
  Panopea bitruncata (Conrad, 1872) -- valid -- Atlantic geoduck
  Papyridea semisulcata (J. E. Gray, 1825) -- valid -- frilled papercockle
  Papyridea soleniformis (Bruguiere, 1789) -- valid -- spiny papercockle
  Parabornia squillina Boss, 1965 -- valid -- squillaclam
  Parahyotissa mcgintyi Harry, 1985 -- valid -- mcginty oyster
  Paramya subovata (Conrad, 1845) -- valid -- subovate softshell clam, subovate softshell
  Parapholas californica (Conrad, 1837) -- valid -- scaleside piddock
  Parastarte triquetra (Conrad, 1846) -- valid -- brown gemclam
  Paravitrea alethia Hubricht, 1978 -- valid -- goddess supercoil
  Paravitrea amicalola Hubricht, 1976 -- valid -- tight supercoil
  Paravitrea andrewsae (W. G. Binney, 1879) -- valid -- high mountain supercoil
  Paravitrea bellona Hubricht, 1978 -- valid -- club supercoil
  Paravitrea bidens Hubricht, 1963 -- valid -- gray supercoil
  Paravitrea blarina Hubricht, 1963 -- valid -- shrew supercoil
  Paravitrea calcicola H. B. Baker, 1931 -- valid -- pearl supercoil
  Paravitrea capsella (Gould, 1851) -- valid -- dimple supercoil
  Paravitrea ceres Hubricht, 1978 -- valid -- sidelong supercoil
  Paravitrea clappi (Pilsbry, 1898) -- valid -- Mirey Ridge supercoil
  Paravitrea conecuhensis (G. H. Clapp, 1917) -- valid -- triangular supercoil
  Paravitrea dentilla Hubricht, 1978 -- valid -- comb supercoil
  Paravitrea diana Hubricht, 1983 -- valid -- hunted supercoil
  Paravitrea grimmi Hubricht, 1968 -- valid -- buff supercoil
  Paravitrea hera Hubricht, 1983 -- valid -- spirit supercoil
  Paravitrea lacteodens (Pilsbry, 1903) -- valid -- Ramp Cove supercoil
  Paravitrea lamellidens (Pilsbry, 1898) -- valid -- lamellate supercoil
  Paravitrea lapilla Hubricht, 1965 -- valid -- gem supercoil
  Paravitrea metallacta Hubricht, 1963 -- valid -- Caneyfork supercoil
  Paravitrea mira Hubricht, 1975 -- valid -- funnel supercoil
  Paravitrea multidentata (A. Binney, 1840) -- valid -- dentate supercoil
  Paravitrea petrophila (Bland, 1883) -- valid -- Cherokee supercoil
  Paravitrea pilsbryana (G. H. Clapp, 1919) -- valid -- translucent supercoil
  Paravitrea placentula (Shuttleworth, 1852) -- valid -- glossy supercoil
  Paravitrea pontis H. B. Baker, 1931 -- valid -- Natural Bridge supercoil
  Paravitrea reesei Morrison, 1937 -- valid -- round supercoil
  Paravitrea septadens Hubricht, 1978 -- valid -- brown supercoil
  Paravitrea seradens Hubricht, 1972 -- valid -- barred supercoil
  Paravitrea significans (Bland, 1866) -- valid -- domed supercoil
  Paravitrea simpsoni (Pilsbry, 1889) -- valid -- amber supercoil
  Paravitrea subtilis Hubricht, 1978 -- valid -- slender supercoil
  Paravitrea tantilla Hubricht, 1963 -- valid -- teasing supercoil
  Paravitrea ternaria Hubricht, 1978 -- valid -- sculpted supercoil
  Paravitrea tiara Hubricht, 1978 -- valid -- crowned supercoil
  Paravitrea toma Hubricht, 1975 -- valid -- sharp supercoil
  Paravitrea tridens Pilsbry, 1946 -- valid -- white-footed supercoil, white foot supercoil
  Paravitrea umbilicaris (Ancey, 1887) -- valid -- open supercoil
  Paravitrea variabilis H. B. Baker, 1929 -- valid -- variable supercoil
  Paravitrea varidens Hubricht, 1978 -- valid -- roan supercoil
  Parvilucina approximata (Dall, 1901) -- valid -- approximate lucine, beaked lucine
  Parvilucina blanda (Bland and Simpson, 1901) -- valid -- three-ridge lucine
  Parvilucina multilineata (Tuomey and Holmes, 1857) -- valid -- many-lined lucine, many-line lucine
  Parvilucina tenuisculpta (Carpenter, 1864) -- valid -- fine-lined lucine, fine-line lucine
  Parviturbo acuticostatus (Carpenter, 1864) -- valid -- sharp-rib cyclostreme
  Parviturbo calidimaris Pilsbry and McGinty, 1945 -- valid -- tropical cyclostreme
  Parviturboides interruptus (C. B. Adams, 1850) -- valid -- interrupted vitrinella
  Patelloida pustulata (Helbling, 1779) -- valid -- spotted limpet
  Patinopecten caurinus (Gould, 1850) -- valid -- weathervane scallop
  Pecten chazaliei Dautzenberg, 1900 -- valid -- tereinus scallop, dwarf zigzag scallop
  Pectinella sigsbeei (Dall, 1886) -- valid -- sigsbee scallop, glass scallop
  Pedicularia californica Newcomb, 1864 -- valid -- California pedicularia
  Pedicularia decussata Gould, 1855 -- valid -- hatched pedicularia
  Pedipes angulatus C. B. Adams, 1852 -- valid -- angular pedipes
  Pedipes mirabilis (Megerle von Muhlfeld, 1816) -- valid -- miraculous pedipes
  Pedipes unisulcatus J. G. Cooper, 1867 -- valid -- one-groove pedipes
  Pegias fabula (Lea, 1838) -- valid -- littlewing pearlymussel, little-wing pearly mussel
  Penitella conradi Valenciennes, 1846 -- valid -- abalone piddock
  Penitella fitchi Turner, 1955 -- valid -- Fitch piddock
  Penitella gabbii (Tryon, 1863) -- valid -- gabb piddock
  Penitella kamakurensis (Yokoyama, 1922) -- valid -- alaska piddock
  Penitella penita (Conrad, 1837) -- valid -- flap-tip piddock
  Penitella turnerae Evans and Fisher, 1966 -- valid -- Turner piddock
  Peracle bispinosa Pelseneer, 1888 -- valid -- two-spine pteropod
  Peracle reticulata (d'Orbigny, 1836) -- valid -- reticulate pteropod
  Periglypta listeri (J. E. Gray, 1838) -- valid -- princess venus
  Periploma affine A. E. Verrill and Bush, 1898 -- valid -- arelated spoonclam, related spoonclam
  Periploma aleuticum (Krause, 1885) -- valid -- Aleutian spoonclam
  Periploma anguliferum (Philippi, 1847) -- valid -- angled spoonclam
  Periploma discus Stearns, 1890 -- valid -- round spoonclam
  Periploma fragile (Totten, 1835) -- valid -- fragile spoonclam
  Periploma leanum (Conrad, 1831) -- valid -- lea spoonclam, oval spoonclam
  Periploma margaritaceum (Lamarck, 1801) -- valid -- unequal spoonclam
  Periploma papyratium (Say, 1822) -- valid -- paper spoonclam
  Periploma planiusculum G. B. Sowerby I, 1834 -- valid -- flat spoonclam
  Periploma tenerum P. Fischer, 1882 -- valid -- delicate spoonclam
  Perotrochus amabilis (Bayer, 1963) -- valid -- lovely slitsnail
  Persicula catenata (Montagu, 1803) -- valid -- princess marginella
  Persicula pulcherrima (Gaskoin, 1849) -- valid -- decorated marginella
  Petaloconchus compactus (Carpenter, 1864) -- valid -- compact wormsnail
  Petaloconchus erectus (Dall, 1888) -- valid -- erect wormsnail
  Petaloconchus montereyensis Dall, 1919 -- valid -- Monterey wormsnail
  Petaloconchus varians (d'Orbigny, 1841) -- valid -- variable wormsnail
  Petricola californiensis Pilsbry and Lowe, 1932 -- valid -- California petricola, California petricolid
  Petricola lapicida (Gmelin, 1791) -- valid -- boring petricola
  Petricola pholadiformis Lamarck, 1818 -- invalid -- false angelwing
  Phalium coronadoi (Crosse, 1867) -- valid -- Coronado bonnet
  Phalium granulatum (Born, 1778) -- valid -- Scotch bonnet
  Phenacovolva piragua (Dall, 1889) -- valid -- slender simnia
  Phidiana hiltoni (O'Donoghue, 1927) -- valid -- pugnaceous aeolis
  Philine alba Mattox, 1958 -- valid -- white paper-bubble, white paperbubble
  Philine angulata Jeffreys, 1867 -- valid -- angled paper-bubble, angled paperbubble
  Philine californica Willett, 1944 -- valid -- california paper-bubble, California paperbubble
  Philine cingulata G. O. Sars, 1878 -- valid -- girdled paper-bubble, girdled paperbubble
  Philine finmarchica M. Sars, 1858 -- valid -- finmark paper-bubble
  Philine fragilis G. O. Sars, 1878 -- valid -- fragile paper-bubble, fragile paperbubble
  Philine lima (T. Brown, 1825) -- valid -- file paper-bubble, file paperbubble
  Philine polaris Aurivillius, 1885 -- valid -- axial paper-bubble, axial paperbubble
  Philine quadrata (S. V. Wood, 1839) -- valid -- quadrate paper-bubble, quadrate paperbubble
  Philine sagra (d'Orbigny, 1841) -- valid -- crenulate paper-bubble, crenulate paperbubble
  Philine sinuata Stimpson, 1851 -- valid -- sinuate paper-bubble, sinuate paperbubble
  Philine tincta A. E. Verrill, 1882 -- valid -- tinted paper-bubble, tinted paperbubble
  Philinopsis pusa (Ev. Marcus and Er. Marcus, 1967) -- valid -- pusa aglaja
  Philippia krebsii (Morch, 1875) -- valid -- smooth sundial
  Philobrya setosa (Carpenter, 1864) -- valid -- hairy philobrya
  Philomycus carolinianus (Bosc, 1802) -- valid -- Carolina mantleslug
  Philomycus flexuolaris Rafinesque, 1820 -- valid -- winding mantleslug
  Philomycus sellatus Hubricht, 1972 -- valid -- Alabama mantleslug
  Philomycus togatus (Gould, 1841) -- valid -- toga mantleslug
  Philomycus venustus Hubricht, 1953 -- valid -- brown-spotted mantleslug
  Philomycus virginicus Hubricht, 1953 -- valid -- Virginia mantleslug
  Pholas campechiensis Gmelin, 1791 -- valid -- Campeche angelwing
  Phreatodrobia conica Hershler and Longley, 1986 -- valid -- Hueco Cavesnail
  Phreatodrobia imitata Hershler and Longley, 1986 -- valid -- Mimic Cavesnail
  Phreatodrobia micra (Pilsbry and Ferriss, 1906) -- valid -- Flattened Cavesnail
  Phreatodrobia nugax (Pilsbry and Ferriss, 1906) -- valid -- Domed Cavesnail
  Phreatodrobia plana Hershler and Longley, 1986 -- valid -- Disc Cavesnail
  Phreatodrobia punctata Hershler and Longley, 1986 -- valid -- High-hat Cavesnail
  Phreatodrobia rotunda Hershler and Longley, 1986 -- valid -- Beaked Cavesnail
  Phyllaplysia smaragda K. B. Clark, 1977 -- valid -- emerald leafslug
  Phyllaplysia taylori Dall, 1900 -- valid -- zebra leafslug
  Physa jennessi Dall, 1919 -- valid -- Obtuse Physa
  Physa skinneri Taylor, 1954 -- valid -- Glass Physa
  Physella acuta (Draparnaud, 1805) -- valid -- European physa
  Physella ancillaria (Say, 1825) -- valid -- Pumpkin Physa
  Physella bermudezi (Aguayo, 1935) -- valid -- Lowdome Physa
  Physella bottimeri (Clench, 1924) -- valid -- Comanche Physa
  Physella boucardi (Crosse and P. Fischer, 1881) -- valid -- Desert Physa
  Physella columbiana (Hemphill, 1890) -- valid -- Rotund Physa
  Physella conoidea (P. Fischer and Crosse, 1886) -- valid -- Texas Physa
  Physella cooperi (Tryon, 1865) -- valid -- Olive Physa
  Physella costata (Newcomb, 1861) -- valid -- Ornate Physa
  Physella cubensis (Pfeiffer, 1839) -- valid -- Carib Physa
  Physella globosa (Haldeman, 1841) -- valid -- Globose Physa
  Physella gyrina (Say, 1821) -- valid -- Tadpole Physa
  Physella hendersoni (Clench, 1925) -- valid -- Bayou Physa
  Physella heterostropha (Say, 1817) -- valid -- Pewter Physa
  Physella hordacea (Lea, 1864) -- valid -- Grain Physa
  Physella humerosa (Gould, 1855) -- valid -- Corkscrew Physa
  Physella integra (Haldeman, 1841) -- valid -- Ashy Physa
  Physella johnsoni (Clench, 1926) -- valid -- Banff Springs Physa
  Physella lordi (Baird, 1863) -- valid -- Twisted Physa
  Physella magnalacustris (Walker, 1901) -- valid -- Great Lakes Physa
  Physella microstriata (Chamberlin and E. G. Berry, 1930) -- valid -- Fish Lake Physa
  Physella osculans (Haldeman, 1841) -- valid -- Cayuse Physa
  Physella parkeri (Currier, 1881) -- valid -- Broadshoulder Physa
  Physella propinqua (Tryon, 1865) -- valid -- Rocky Mountain Physa
  Physella spelunca (Turner and Clench, 1974) -- valid -- Cave Physa
  Physella squalida (Morelet, 1851) -- valid -- Squalid Physa
  Physella traski (Lea, 1864) -- valid -- Sculpted Physa
  Physella utahensis (Clench, 1925) -- valid -- Utah Physa
  Physella vinosa (Gould, 1848) -- valid -- Banded Physa
  Physella virgata (Gould, 1855) -- valid -- Protean Physa
  Physella virginea (Gould, 1847) -- valid -- Sunset Physa
  Physella wrighti Te and Clarke, 1985 -- valid -- Hotwater Physa
  Physella zionis (Pilsbry, 1926) -- valid -- Wet-rock Physa
  Pilsbryna aurea H. B. Baker, 1929 -- valid -- ornate bud
  Pilsbryna castanea H. B. Baker, 1931 -- valid -- prominent bud
  Pinctada imbricata Roding, 1798 -- valid -- Atlantic pearl-oyster
  Pinna carnea Gmelin, 1791 -- valid -- amber penshell
  Pinna rudis Linnaeus, 1758 -- valid -- rough penshell
  Pisania pusio (Linnaeus, 1758) -- valid -- miniature trumpet triton
  Pisidium adamsi Stimpson, 1851 -- valid -- Adam peaclam
  Pisidium amnicum (Muller, 1774) -- valid -- greater European peaclam
  Pisidium casertanum (Poli, 1791) -- valid -- ubiquitous peaclam
  Pisidium compressum Prime, 1852 -- valid -- ridged-beak peaclam, ridgebeak peaclam
  Pisidium conventus Clessin, 1877 -- valid -- Alpine peaclam
  Pisidium cruciatum Sterki, 1895 -- valid -- ornamented peaclam
  Pisidium dubium (Say, 1817) -- valid -- greater eastern peaclam
  Pisidium equilaterale Prime, 1852 -- valid -- round peaclam
  Pisidium fallax Sterki, 1896 -- valid -- river peaclam
  Pisidium ferrugineum Prime, 1852 -- valid -- rusty peaclam
  Pisidium henslowanum (Sheppard, 1825) -- valid -- Henslow peaclam
  Pisidium idahoense E. W. Roper, 1890 -- valid -- giant northern peaclam
  Pisidium insigne Gabb, 1868 -- valid -- tiny peaclam
  Pisidium lilljeborgi (Clessin, 1886) -- valid -- Lilljeborg peaclam
  Pisidium milium Held, 1836 -- valid -- quadrangular pillclam
  Pisidium nitidum Jenyns, 1832 -- valid -- shiny peaclam
  Pisidium punctatum Sterki, 1895 -- valid -- perforated peaclam
  Pisidium punctiferum (Guppy, 1867) -- valid -- striate peaclam
  Pisidium rotundatum Prime, 1852 -- valid -- fat peaclam
  Pisidium subtruncatum Malm, 1855 -- valid -- short-ended peaclam, shortended peaclam
  Pisidium supinum Schmidt, 1850 -- valid -- humpbacked peaclam
  Pisidium ultramontanum Prime, 1865 -- valid -- montane peaclam
  Pisidium variabile Prime, 1852 -- valid -- triangular peaclam
  Pisidium ventricosum Prime, 1851 -- valid -- globular peaclam
  Pisidium walkeri Sterki, 1895 -- valid -- Walker peaclam
  Pitar albidus (Gmelin, 1791) -- valid -- white pitar
  Pitar arestus (Dall and Simpson, 1901) -- valid -- pleasing pitar
  Pitar cordatus (Schwengel, 1951) -- valid -- Schwengel pitar, corded pitar
  Pitar fulminatus (Menke, 1828) -- valid -- lightning pitar
  Pitar morrhuanus (Linsley, 1848) -- valid -- false quahog
  Pitar newcombianus (Gabb, 1865) -- valid -- Newcomb pitar
  Pitar pilula Rehder, 1943 -- valid -- little-pill pitar
  Pitar simpsoni (Dall, 1895) -- valid -- Simpson pitar, chalky pitar
  Pitar zonatus (Dall, 1902) -- valid -- banded pitar
  Placiphorella Dall, 1879 -- valid -- boreal veiled chiton
  Placiphorella rufa S. S. Berry, 1917 -- valid -- red veiled chiton
  Placopecten magellanicus (Gmelin, 1791) -- valid -- sea scallop
  Planaxis lineatus (E. M. da Costa, 1778) -- valid -- dwarf planaxis
  Planaxis nucleus (Bruguiere, 1789) -- valid -- black planaxis
  Planogyra asteriscus (E. S. Morse, 1857) -- valid -- eastern flat-whorl
  Planogyra clappi (Pilsbry, 1898) -- valid -- western flat-whorl
  Planorbella ammon (Gould, 1855) -- valid -- Jupiter Rams-horn, Jupiter Ramshorn
  Planorbella binneyi (Tryon, 1867) -- valid -- Coarse Rams-horn, Coarse Ramshorn
  Planorbella campanulata (Say, 1821) -- valid -- Bellmouth Rams-horn, Bellmouth Ramshorn
  Planorbella columbiensis (F. C. Baker, 1945) -- valid -- Caribou Rams-horn, Caribou Ramshorn
  Planorbella corpulenta (Say, 1824) -- valid -- Corpulent Rams-horn, Corpulent Ramshorn
  Planorbella duryi (Wetherby, 1879) -- valid -- Seminole Rams-horn, Seminole Ramshorn
  Planorbella magnifica (Pilsbry, 1903) -- valid -- Magnificent Rams-horn, Magnificent Ramshorn
  Planorbella multivolvis (Case, 1847) -- valid -- Acorn Rams-horn, Acorn Ramshorn
  Planorbella occidentalis (J. G. Cooper, 1870) -- valid -- Fine-lined Rams-horn
  Planorbella oregonensis (Tryon, 1865) -- valid -- Lamb Rams-horn, Lamb Ramshorn
  Planorbella pilsbryi (F. C. Baker, 1926) -- valid -- file rams-horn, File Ramshorn
  Planorbella scalaris (Jay, 1839) -- valid -- Mesa Rams-horn, Mesa Ramshorn
  Planorbella tenuis (Dunker, 1850) -- valid -- Mexican Rams-horn, Mexican Ramshorn
  Planorbella traski (Lea, 1856) -- valid -- Keeled Rams-horn, Keeled Ramshorn
  Planorbella trivolvis (Say, 1817) -- valid -- marsh rams-horn, Marsh Ramshorn
  Planorbella truncata (M. Miles, 1861) -- valid -- Druid Rams-horn, Druid Ramshorn
  Platydoris macfarlandi Hanna, 1951 -- valid -- California flat doris
  Platyodon cancellatus (Conrad, 1837) -- valid -- boring softshell clam, boring softshell
  Plectodon granulatus (Dall, 1881) -- valid -- grainy plectodon
  Plectodon scaber Carpenter, 1864 -- valid -- rough plectodon
  Plectomerus dombeyanus (Valenciennes in Humboldt & Bonpland, 1827) -- valid -- bankclimber
  Plesarionta stearnsiana (Gabb, 1867) -- valid -- speckled cactussnail
  Plethobasus cicatricosus (Say, 1829) -- valid -- white wartyback, white wartyback pearly mussel
  Plethobasus cooperianus (Lea, 1834) -- valid -- orange-footed pearly mussel, orangefoot pimpleback
  Plethobasus cyphyus (Rafinesque, 1820) -- valid -- sheepnose
  Pleurobema altum (Conrad, 1854) -- invalid -- highnut
  Pleurobema avellanum Simpson, 1900 -- invalid -- hazel pigtoe
  Pleurobema beadleianum (Lea, 1861) -- valid -- Mississippi pigtoe
  Pleurobema bournianum (Lea, 1840) -- invalid -- Scioto pigtoe
  Pleurobema chattanoogaense (Lea, 1858) -- invalid -- painted clubshell
  Pleurobema clava (Lamarck, 1819) -- valid -- clubshell
  Pleurobema coccineum (Conrad, 1836) -- invalid -- round pigtoe
  Pleurobema collina (Conrad, 1837) -- invalid -- James River spinymussel, James spinymussel, Virginia spinymussel
  Pleurobema cordatum (Rafinesque, 1820) -- valid -- Ohio pigtoe
  Pleurobema curtum (Lea, 1859) -- valid -- black clubshell, Curtus' mussel
  Pleurobema decisum (Lea, 1831) -- valid -- southern clubshell
  Pleurobema flavidulum (Lea, 1861) -- invalid -- yellow pigtoe
  Pleurobema furvum (Conrad, 1834) -- invalid -- dark pigtoe
  Pleurobema georgianum (Lea, 1841) -- valid -- southern pigtoe
  Pleurobema gibberum (Lea, 1838) -- invalid -- Cumberland pigtoe, Cumberland pigtoe mussel
  Pleurobema hanleyianum (Lea, 1852) -- valid -- Georgia pigtoe
  Pleurobema johannis (Lea, 1859) -- invalid -- Alabama pigtoe
  Pleurobema marshalli Frierson, 1927 -- valid -- flat pigtoe, Marshall's mussel
  Pleurobema murrayense (Lea, 1868) -- invalid -- Coosa pigtoe
  Pleurobema nucleopsis (Conrad, 1849) -- invalid -- longnut
  Pleurobema oviforme (Conrad, 1834) -- valid -- Tennessee clubshell
  Pleurobema perovatum (Conrad, 1834) -- valid -- ovate clubshell
  Pleurobema plenum (Lea, 1840) -- valid -- rough pigtoe
  Pleurobema pyramidatum (Lea, 1831) -- invalid -- pyramid pigtoe
  Pleurobema pyriforme (Lea, 1857) -- valid -- oval pigtoe
  Pleurobema riddellii (Lea, 1862) -- valid -- Louisiana pigtoe
  Pleurobema rubellum (Conrad, 1834) -- valid -- Warrior pigtoe
  Pleurobema strodeanum (B. H. Wright, 1898) -- valid -- fuzzy pigtoe
  Pleurobema taitianum (Lea, 1834) -- valid -- heavy pigtoe, Judge Tait's mussel
  Pleurobema troschelianum (Lea, 1852) -- invalid -- Alabama clubshell
  Pleurobema verum (Lea, 1861) -- valid -- true pigtoe
  Pleurobranchus areolatus Morch, 1863 -- valid -- Atlantic sidegill slug
  Pleurocera acuta Rafinesque, 1831 -- valid -- Sharp Hornsnail
  Pleurocera alveare (Conrad, 1834) -- valid -- Rugged Hornsnail
  Pleurocera annulifera (Conrad, 1834) -- valid -- Ringed Hornsnail
  Pleurocera brumbyi (Lea, 1852) -- valid -- Spiral Hornsnail
  Pleurocera canaliculata (Say, 1821) -- valid -- Silty Hornsnail
  Pleurocera corpulenta (Anthony, 1854) -- valid -- Corpulent Hornsnail
  Pleurocera curta (Haldeman, 1841) -- valid -- Shortspire Hornsnail
  Pleurocera foremani (Lea, 1843) -- valid -- Rough Hornsnail
  Pleurocera gradata (Anthony, 1854) -- valid -- Bottle Hornsnail
  Pleurocera nobilis (Lea, 1845) -- valid -- Noble Hornsnail
  Pleurocera parva (Lea, 1862) -- valid -- Dainty Hornsnail
  Pleurocera postelli (Lea, 1862) -- valid -- Broken Hornsnail
  Pleurocera prasinata (Conrad, 1834) -- valid -- Smooth Hornsnail
  Pleurocera pyrenella (Conrad, 1834) -- valid -- Skirted Hornsnail
  Pleurocera showalteri (Lea, 1862) -- valid -- Upland Hornsnail
  Pleurocera trochiformis (Conrad, 1834) -- valid -- Sulcate Hornsnail
  Pleurocera uncialis (Haldeman, 1841) -- valid -- Pagoda Hornsnail
  Pleurocera vestita (Conrad, 1834) -- valid -- Brook Hornsnail
  Pleurocera walkeri Goodrich, 1928 -- valid -- Telescope Hornsnail
  Pleuromeris armilla (Dall, 1903) -- valid -- armlet carditid
  Pleuromeris perplana (Conrad, 1841) -- valid -- flattened carditid
  Pleuromeris tridentata (Say, 1826) -- valid -- three-tooth carditid, threetooth carditid
  Pleuroploca gigantea (Kiener, 1840) -- valid -- horse conch
  Plicatula gibbosa Lamarck, 1801 -- valid -- Atlantic kittenpaw
  Plicifusus cretaceus (Reeve, 1847) -- valid -- chalky whelk
  Pododesmus macrochisma (Deshayes, 1839) -- valid -- alaska jingle
  Pododesmus pernoides (J. E. Gray, 1853) -- valid -- pedestal falsejingle, brown falsejingle
  Pododesmus rudis (Broderip, 1834) -- valid -- Atlantic falsejingle
  Policordia insculpta (Jeffreys, 1881) -- valid -- sculptureless verticord
  Polinices hepaticus (Roding, 1798) -- valid -- brown moonsnail
  Polinices lacteus (Guilding, 1834) -- valid -- milk moonsnail
  Polinices uberinus (d'Orbigny, 1842) -- valid -- dwarf white moonsnail, white moonsnail
  Polycera atra MacFarland, 1905 -- valid -- orange-spike polycera
  Polycera tricolor Robilliard, 1971 -- valid -- three-color polycera
  Polycera zosterae O'Donoghue, 1924 -- valid -- eelgrass polycera
  Polygyra auriculata Say, 1818 -- valid -- ocala liptooth
  Polygyra auriformis (Bland, 1859) -- valid -- gulf coast liptooth
  Polygyra avara Say, 1818 -- valid -- florida liptooth
  Polygyra cereolus (Megerle von Muhlfeld, 1816) -- valid -- southern flatcoil
  Polygyra chisosensis (Pilsbry, 1936) -- valid -- chisos liptooth
  Polygyra delecta Hubricht, 1976 -- valid -- gulf hammock liptooth
  Polygyra deltoidea (Simpson, 1889) -- valid -- oklahoma liptooth
  Polygyra dorfueilliana (I. Lea, 1838) -- valid -- oakwood liptooth
  Polygyra fastigiata (Say, 1829) -- valid -- bluegrass liptooth
  Polygyra gracilis Hubricht, 1961 -- valid -- edwards plateau liptooth
  Polygyra hausmani Jackson, 1948 -- valid -- dixie liptooth
  Polygyra hippocrepis (Pfeiffer, 1848) -- valid -- horseshoe liptooth
  Polygyra jacksoni (Bland, 1866) -- valid -- ozark liptooth
  Polygyra leporina (Gould, 1848) -- valid -- gulf coast liptooth
  Polygyra mooreana (W. G. Binney, 1858) -- valid -- grassland liptooth
  Polygyra peninsulae Pilsbry, 1940 -- valid -- st. johns liptooth
  Polygyra peregrina (Rehder, 1832) -- valid -- white liptooth
  Polygyra plana bahamensis Vanatta, 1919 -- valid -- Bahama flatcoil
  Polygyra plicata (Say, 1821) -- valid -- cumberland liptooth
  Polygyra polita Pilsbry and Hinkley, 1907 -- valid -- tamaulipas liptooth
  Polygyra postelliana (Bland, 1859) -- valid -- coastal liptooth
  Polygyra pustula (Say, 1821) -- valid -- grooved liptooth
  Polygyra pustuloides (Bland, 1858) -- valid -- tiny liptooth
  Polygyra septemvolva Say, 1818 -- valid -- Florida flatcoil
  Polygyra simpsoni (Pilsbry and Ferriss, 1907) -- valid -- wyandotte liptooth
  Polygyra subclausa Pilsbry, 1940 -- valid -- suwannee liptooth
  Polygyra texasiana (Moricand, 1833) -- valid -- texas liptooth
  Polygyra troostiana (I. Lea, 1839) -- valid -- nashville liptooth
  Polygyra uvulifera (Shuttleworth, 1852) -- valid -- peninsula liptooth
  Polygyrella polygyrella (Bland and J. G. Cooper, 1861) -- valid -- humped coin
  Polygyriscus virginianus (P. R. Burch, 1947) -- valid -- virginia coil, virginia fringed mountain snail
  Polygyroidea harfordiana (J. G. Cooper, 1870) -- valid -- toothed coin
  Polymesoda caroliniana (Bosc, 1801) -- valid -- Carolina marshclam
  Polymesoda maritima (d'Orbigny, 1842) -- valid -- southern marshclam
  Polyschides agassizii (Dall, 1881) -- valid -- agassiz toothshell
  Polyschides californicus (Pilsbry and Sharp, 1898) -- valid -- California toothshell
  Polyschides carolinensis (Bush, 1885) -- valid -- Carolina toothshell
  Polyschides elongatus (J. B. Henderson, 1920) -- valid -- elongate toothshell
  Polyschides grandis (A. E. Verrill, 1884) -- valid -- grand toothshell
  Polyschides greenlawi (Dall, 1889) -- valid -- greenlaw toothshell
  Polyschides miamiensis (J. B. Henderson, 1920) -- valid -- Miami toothshell
  Polyschides pandionis (A. E. Verrill and S. Smith, 1880) -- valid -- kingly toothshell
  Polyschides parvus (J. B. Henderson, 1920) -- valid -- little toothshell
  Polyschides quadridentatus (Dall, 1881) -- valid -- four-tooth toothshell, fourtooth toothshell
  Polyschides rushii (Pilsbry and Sharp, 1898) -- valid -- rush toothshell
  Polyschides spectabilis (A. E. Verrill, 1885) -- valid -- notable toothshell
  Polyschides tetrodon (Pilsbry and Sharp, 1898) -- valid -- tetrodon toothshell
  Polyschides tolmiei (Dall, 1897) -- valid -- tolmie toothshell
  Polyschides watsoni (Dall, 1881) -- valid -- watson toothshell
  Pomacea bridgesi (Reeve, 1856) -- invalid -- Spiketopped Applesnail
  Pomacea paludosa (Say, 1829) -- valid -- Florida Applesnail
  Pomatiopsis binneyi Tryon, 1863 -- valid -- Robust Walker
  Pomatiopsis californica Pilsbry, 1899 -- valid -- Pacific Walker
  Pomatiopsis chacei Pilsbry, 1937 -- valid -- Marsh Walker
  Pomatiopsis cincinnatiensis (Lea, 1840) -- valid -- Brown Walker
  Pomatiopsis lapidaria (Say, 1817) -- valid -- Slender Walker
  Popenaias popei (Lea, 1857) -- invalid -- Texas hornshell
  Poromya albida Dall, 1886 -- valid -- white poromya
  Poromya elongata Dall, 1886 -- valid -- elongate poromya
  Poromya granulata (Nyst and Westendorp, 1839) -- valid -- granular poromya
  Poromya rostrata Rehder, 1943 -- valid -- rostrate poromya
  Poromya trosti Strong and Hertlein, 1937 -- valid -- trost poromya
  Portlandia arctica (J. E. Gray, 1824) -- valid -- arctic nutclam, Arctic yoldia
  Portlandia dalli Krause, 1885 -- valid -- dall nutclam
  Potamilus alatus (Say, 1817) -- valid -- pink heelsplitter
  Potamilus amphichaenus (Frierson, 1898) -- valid -- Texas heelsplitter
  Potamilus capax (Green, 1832) -- valid -- fat pocketbook
  Potamilus inflatus (Lea, 1831) -- valid -- Alabama heelsplitter, inflated heelsplitter
  Potamilus ohiensis (Rafinesque, 1820) -- valid -- pink papershell
  Potamilus purpuratus (Lamarck, 1819) -- valid -- bleufer
  Praticolella bakeri Vanatta, 1915 -- valid -- orlando shrubsnail, ridge scrubsnail
  Praticolella berlandieriana (Moricand, 1833) -- valid -- shoulder-banded shrubsnail, banded scrubsnail
  Praticolella candida Hubricht, 1983 -- valid -- white shrubsnail, white scrubsnail
  Praticolella griseola (Pfeiffer, 1841) -- valid -- vera cruz shrubsnail, vagrant scrubsnail
  Praticolella jejuna (Say, 1821) -- valid -- florida shrubsnail
  Praticolella lawae (J. Lewis, 1874) -- valid -- appalachian shrubsnail, Appalachian scrubsnail
  Praticolella mobiliana (I. Lea, 1841) -- valid -- mobile shrubsnail, Choctaw scrubsnail
  Praticolella pachyloma (Menke, 1847) -- valid -- sandyland shrubsnail, sandyland scrubsnail
  Praticolella taeniata Pilsbry, 1940 -- valid -- many-banded shrubsnail, striped scrubsnail
  Praticolella trimatris Hubricht, 1983 -- valid -- hidalgo shrubsnail, Hidalgo scrubsnail
  Precuthona divae (Mcfarland, 1966) -- valid -- rose-pink cuthona
  Primovula solemi Cate, 1973 -- valid -- robust miniovula
  Pristes oblongus Carpenter, 1864 -- valid -- chiton clam
  Pristiloma arcticum (Lehnert, 1884) -- valid -- northern tightcoil
  Pristiloma chersinella (Dall, 1886) -- valid -- black-footed tightcoil
  Pristiloma gabrielinum (S. S. Berry, 1924) -- valid -- waxy tightcoil
  Pristiloma idahoense Pilsbry, 1902 -- valid -- thin-lip tightcoil, thinlip tightcoil
  Pristiloma johnsoni (Dall, 1895) -- valid -- broadwhorl tightcoil
  Pristiloma juniperum A. G. Smith, 1957 -- valid -- cedar tightcoil, juniper tightcoil
  Pristiloma lansingi (Bland, 1875) -- valid -- denticulate tightcoil
  Pristiloma nicholsoni H. B. Baker, 1930 -- valid -- riparian tightcoil
  Pristiloma orotis (S. S. Berry, 1930) -- valid -- minute tightcoil
  Pristiloma pilsbryi Vanatta, 1899 -- valid -- crowned tightcoil
  Pristiloma shepardae (Hemphill, 1892) -- valid -- island tightcoil
  Pristiloma stearnsi (Bland, 1875) -- valid -- striate tightcoil
  Pristiloma subrupicola (Dall, 1877) -- valid -- southern tightcoil
  Pristiloma wascoense (Hemphill, 1911) -- valid -- shiny tightcoil
  Problacmaea apicina (Dall, 1879) -- valid -- cap limpet
  Problacmaea rubella (Fabricius, 1780) -- valid -- reddish limpet
  Problacmaea sybaritica (Dall, 1872) -- valid -- lush limpet
  Probythinella lacustris (F. C. Baker, 1928) -- invalid -- Delta Hydrobe
  Promenetus exacuous (Say, 1821) -- valid -- Sharp Sprite
  Promenetus umbilicatellus (Cockerell, 1887) -- valid -- Umbilicate Sprite
  Propeamussium cancellatum (E. A. Smith, 1885) -- valid -- acancellate glass-scallop, cancellate glass-scallop
  Propeamussium holmesii (Dall, 1886) -- valid -- Holmes glass-scallop
  Propeamussium pourtalesianum (Dall, 1886) -- valid -- Pourtales glass-scallop
  Propeamussium thalassinum (Dall, 1886) -- valid -- miniature glass-scallop
  Prophysaon andersoni (J. G. Cooper, 1872) -- valid -- reticulate taildropper
  Prophysaon boreale Pilsbry, 1948 -- valid -- northern taildropper
  Prophysaon coeruleum Cockerell, 1890 -- valid -- blue-gray taildropper
  Prophysaon dubium Cockerell, 1890 -- valid -- papillose taildropper
  Prophysaon fasciatum Cockerell, 1890 -- valid -- banded taildropper
  Prophysaon foliolatum (Gould, 1851) -- valid -- yellow-bordered taildropper
  Prophysaon humile Cockerell, 1890 -- valid -- smoky taildropper
  Prophysaon obscurum Cockerell, 1890 -- valid -- mottled taildropper
  Prophysaon vanattae Pilsbry, 1948 -- valid -- scarletback taildropper
  Protothaca granulata (Gmelin, 1791) -- valid -- beaded venus
  Protothaca laciniata (Carpenter, 1864) -- valid -- fringed littleneck, rough littleneck
  Protothaca staminea (Conrad, 1837) -- valid -- Pacific littleneck
  Protothaca tenerrima (Carpenter, 1857) -- valid -- thin-shell littleneck
  Psephidia cymata Dall, 1913 -- invalid -- wavy dwarf-venus
  Psephidia lordi (Baird, 1863) -- invalid -- Lord dwarf-venus
  Psephidia ovalis Dall, 1902 -- invalid -- oval dwarf-venus
  Psephidia stephensae Hertlein and Grant, 1972 -- invalid -- Stephens dwarf-venus
  Pseudochama exogyra (Conrad, 1837) -- valid -- Pacific jewelbox
  Pseudochama granti Strong, 1934 -- valid -- grant jewelbox, deep jewelbox
  Pseudochama inezae Bayer, 1943 -- valid -- inez jewelbox, alabaster jewelbox
  Pseudochama radians (Lamarck, 1819) -- valid -- Atlantic jewelbox
  Pseudocyphoma gibbulum Cate, 1978 -- valid -- plump cyphoma
  Pseudocyphoma intermedium (G. B. Sowerby I, 1828) -- valid -- intermediate cyphoma
  Pseudomalaxis lamellifera Rehder, 1935 -- valid -- lamellate false dial
  Pseudomalaxis nobilis A. E. Verrill, 1885 -- valid -- noble false dial
  Pseudomiltha floridana (Conrad, 1833) -- valid -- florida lucine
  Pseudosimnia pyrifera Cate, 1973 -- valid -- pear simnia
  Pseudostomatella erythrocoma (Dall, 1889) -- valid -- false stomatella
  Pseudosubulina cheatumi Pilsbry, 1950 -- valid -- Chisos foxsnail
  Pseudosuccinea columella (Say, 1817) -- valid -- Mimic Lymnaea, Mimic Pondsnail
  Psiloteredo megotara (Hanley, 1848) -- valid -- big-ear shipworm
  Pteria colymbus (Roding, 1798) -- valid -- Atlantic wing-oyster
  Pteria longisquamosa (Dunker, 1852) -- valid -- scaly wing-oyster
  Pteria vitrea (Reeve, 1857) -- valid -- glassy wing-oyster
  Pteropurpura festiva (Hinds, 1844) -- valid -- festive murex
  Pteropurpura macroptera (Deshayes, 1839) -- valid -- frill-wing murex
  Pteropurpura trialata (G. B. Sowerby II, 1834) -- valid -- western three-wing murex, three-wing murex
  Pteropurpura vokesae Emerson, 1964 -- valid -- wrinkle-wing murex
  Pterynotus phaneus (Dall, 1889) -- valid -- shining murex
  Ptychatractus ligatus (Mighels and C. B. Adams, 1842) -- valid -- ligate false spindle
  Ptychobranchus fasciolaris (Rafinesque, 1820) -- valid -- kidneyshell
  Ptychobranchus greenii (Conrad, 1834) -- valid -- triangular kidneyshell
  Ptychobranchus jonesi (van der Schalie, 1934) -- valid -- southern kidneyshell
  Ptychobranchus occidentalis (Conrad, 1836) -- valid -- Ouachita kidneyshell
  Ptychobranchus subtentum (Say, 1825) -- invalid -- fluted kidneyshell
  Ptychosalpinx globulus (Dall, 1889) -- valid -- globose whelk
  Pulsellum aberrans (Whiteaves, 1887) -- valid -- aberrant toothshell
  Pulsellum lobatum (G. B. Sowerby II, 1860) -- valid -- lobate toothshell
  Pulsellum occidentale (J. B. Henderson, 1920) -- valid -- westerly toothshell
  Pulsellum salishorum E. Marshall, 1980 -- valid -- Salish toothshell
  Punctum blandianum Pilsbry, 1900 -- valid -- brown spot
  Punctum californicum Pilsbry, 1898 -- valid -- ribbed spot
  Punctum conspectum (Bland, 1865) -- valid -- striate spot
  Punctum minutissimum (I. Lea, 1841) -- valid -- small spot
  Punctum randolphi (Dall, 1895) -- valid -- conical spot
  Punctum smithi Morrison, 1935 -- valid -- lamellate spot
  Punctum vitreum (H. B. Baker, 1930) -- valid -- glass spot
  Puncturella asturiana (P. Fischer, 1882) -- valid -- atlantic puncturella
  Puncturella caryophylla Dall, 1914 -- valid -- clove puncturella
  Puncturella cucullata (Gould, 1846) -- valid -- hood puncturella
  Puncturella decorata I. M. Cowan and J. H. Mclean, 1968 -- valid -- painted puncturella
  Puncturella erecta Dall, 1889 -- valid -- erect puncturella
  Puncturella galeata (Gould, 1846) -- valid -- helmet puncturella
  Puncturella longifissa Dall, 1914 -- valid -- long-slot puncturella
  Puncturella major Dall, 1891 -- valid -- great puncturella
  Puncturella multistriata Dall, 1914 -- valid -- many-ribbed puncturella
  Puncturella noachina (Linnaeus, 1771) -- valid -- diluvian puncturella
  Puncturella punctocostata S. S. Berry, 1947 -- valid -- dot-rib puncturella
  Puperita pupa (Linnaeus, 1767) -- valid -- zebra nerite
  Pupilla blandi E. S. Morse, 1865 -- valid -- Rocky Mountain column
  Pupilla hebes (Ancey, 1881) -- valid -- crestless column
  Pupilla muscorum (Linnaeus, 1758) -- valid -- widespread column
  Pupilla sonorana (Sterki, 1899) -- valid -- three-tooth column
  Pupilla syngenes (Pilsbry, 1890) -- valid -- top-heavy column
  Pupisoma dioscoricola (C. B. Adams, 1845) -- valid -- yam babybody
  Pupisoma macneilli (G. H. Clapp, 1918) -- valid -- Gulf babybody
  Pupoides albilabris (C. B. Adams, 1841) -- valid -- white-lip dagger
  Pupoides hordaceus (Gabb, 1866) -- valid -- ribbed dagger
  Pupoides inornatus Vanatta, 1915 -- valid -- Rocky Mountain dagger
  Pupoides modicus (Gould, 1848) -- valid -- island dagger
  Purpura patula (Linnaeus, 1758) -- valid -- widemouth rocksnail
  Pyrgophorus platyrachis F. G. Thompson, 1968 -- valid -- Serrate Crownsnail, Serrated Crownsnail
  Pyrgophorus spinosus (Call and Pilsbry, 1886) -- valid -- Spiny Crownsnail
  Pyrgulopsis archimedis S. S. Berry, 1947 -- valid -- Archimedes Pyrg
  Pyrgulopsis letsoni (Walker, 1901) -- invalid -- gravel pyrg
  Pyrgulopsis nevadensis (Stearns, 1883) -- valid -- Corded Pyrg
  Pyrgulopsis ozarkensis Hinkley, 1915 -- invalid -- Ozark pyrg
  Pyrgulopsis scalariformis (Wolf, 1870) -- invalid -- moss pyrg
  Pyrunculus caelatus (Bush, 1885) -- valid -- engraved barrel-bubble
  Pyrunculus ovatus (Jeffreys, 1871) -- valid -- ovate barrel-bubble
  Quadrula apiculata (Say, 1829) -- invalid -- southern mapleleaf
  Quadrula asperata (Lea, 1861) -- invalid -- Alabama orb
  Quadrula aurea (Lea, 1859) -- invalid -- golden orb
  Quadrula couchiana (Lea, 1860) -- valid -- Rio Grande monkeyface
  Quadrula cylindrica cylindrica (Say, 1817) -- invalid -- rabbitsfoot
  Quadrula cylindrica strigillata (B. H. Wright, 1898) -- invalid -- rough rabbitsfoot
  Quadrula fragosa (Conrad, 1836) -- valid -- winged mapleleaf, winged mapleleaf mussel
  Quadrula houstonensis (Lea, 1859) -- invalid -- smooth pimpleback
  Quadrula intermedia (Conrad, 1836) -- invalid -- Cumberland monkeyface, Cumberland monkeyface pearly mussel
  Quadrula metanevra (Rafinesque, 1820) -- invalid -- monkeyface
  Quadrula nodulata (Rafinesque, 1820) -- invalid -- wartyback
  Quadrula petrina (Gould, 1855) -- invalid -- Texas pimpleback
  Quadrula pustulosa mortoni (Conrad, 1835) -- invalid -- western pimpleback
  Quadrula pustulosa pustulosa (Lea, 1831) -- invalid -- pimpleback
  Quadrula quadrula (Rafinesque, 1820) -- valid -- mapleleaf
  Quadrula refulgens (Lea, 1868) -- invalid -- purple pimpleback
  Quadrula rumphiana (Lea, 1852) -- invalid -- ridged mapleleaf
  Quadrula sparsa (Lea, 1841) -- invalid -- Appalachian monkeyface, Appalachian monkeyface pearly mussel
  Quadrula stapes (Lea, 1831) -- invalid -- stirrup shell, stirrupshell
  Quadrula tuberosa (Lea, 1840) -- invalid -- rough rockshell
  Quincuncina burkei Walker in Ortmann & Walker, 1922 -- invalid -- tapered pigtoe
  Quincuncina infucata (Conrad, 1834) -- invalid -- sculptured pigtoe
  Quincuncina mitchelli (Simpson in Dall, 1896) -- invalid -- false spike
  Rabdotus alternatus (Say, 1830) -- valid -- striped rabdotus
  Rabdotus dealbatus (Say, 1821) -- valid -- whitewashed rabdotus
  Rabdotus mooreanus (Pfeiffer, 1868) -- valid -- prairie rabdotus
  Rabdotus nigromontanus (Dall, 1897) -- valid -- black mountain rabdotus
  Rabdotus pilsbryi (Ferriss, 1925) -- valid -- elongate rabdotus
  Radiocentrum avalonense (Hemphill, 1905) -- valid -- Catalina mountainsnail
  Radiocentrum chiricahuanum (Pilsbry, 1905) -- valid -- chiricahuana mountainsnail, Chiricahua mountainsnail
  Radiocentrum clappi (Ferriss, 1904) -- valid -- Cave Creek mountainsnail
  Radiocentrum ferrissi (Pilsbry, 1915) -- valid -- fringed mountainsnail
  Radiocentrum hachetanum (Pilsbry, 1915) -- valid -- Hacheta mountainsnail
  Radiodiscus abietum H. B. Baker, 1930 -- valid -- fir pinwheel
  Radiodiscus millecostatus Pilsbry and Ferriss, 1906 -- valid -- ribbed pinwheel
  Radix auricularia (Linnaeus, 1758) -- valid -- big-eared radix
  Raeta plicatella (Lamarck, 1818) -- valid -- channeled duckclam
  Raeta undulata (Gould, 1851) -- valid -- Pacific duckclam
  Rangia cuneata (G. B. Sowerby I, 1831) -- valid -- Atlantic rangia
  Rangia flexuosa (Conrad, 1840) -- valid -- brown rangia
  Recluzia rollandiana Petit de la Saussaye, 1853 -- valid -- brown janthina
  Retusa montereyensis A. G. Smith and M. Gordon, 1948 -- valid -- Monterey barrel-bubble
  Retusa obtusa (Montagu, 1803) -- valid -- Arctic barrel-bubble
  Retusa sulcata (d'Orbigny, 1841) -- valid -- sulcate barrel-bubble
  Retusa xystrum Dall, 1919 -- valid -- polished barrel-bubble
  Rhabdus dalli (Pilsbry and Sharp, 1897) -- valid -- dall tuskshell
  Rhabdus rectius (Carpenter, 1865) -- valid -- straight tuskshell
  Rhabdus watsoni (Sharp and Pilsbry, 1897) -- valid -- watson tuskshell
  Rhamphidonta retifera (Dall, 1899) -- valid -- netted kellyclam
  Rhapinema dacryon F. G. Thompson, 1969 -- valid -- Teardrop Snail
  Rhodacme elatior (Anthony, 1855) -- invalid -- domed ancylid
  Rhodacme filosa (Conrad, 1834) -- invalid -- wicker ancylid
  Rhodacme hinkleyi (Walker, 1908) -- invalid -- knobby ancylid
  Rhodopetala rosea (Dall, 1872) -- valid -- pink limpet
  Rictaxis punctostriatus (C. B. Adams, 1840) -- valid -- apitted baby-bubble, pitted baby-bubble
  Rimula aequisculpta Dall, 1927 -- valid -- webbed rimula
  Rimula californiana S. S. Berry, 1964 -- valid -- California rimula
  Rimula dorriae Perez Farfante, 1947 -- valid -- coarse rimula
  Rimula frenulata (Dall, 1889) -- valid -- bridle rimula
  Rimula pycnonema Pilsbry, 1943 -- valid -- threaded rimula
  Ringicula semistriata D'Orbigny, 1842 -- valid -- striate helmet-bubble
  Rissoella caribaea Rehder, 1943 -- valid -- Caribbean risso
  Rissoella hertleini A. G. Smith and M. Gordon, 1948 -- valid -- Monterey risso
  Rossia bullisi Voss, 1956 -- valid -- Gulf bobtail squid
  Rossia pacifica Berry, 1911 -- valid -- eastern pacific bobtail, North Pacific bobtail squid
  Rossia tortugaensis Voss, 1956 -- valid -- Tortugas bobtail squid
  Rostanga pulchra MacFarland, 1905 -- valid -- red sponge doris
  Rumina decollata (Linnaeus, 1758) -- valid -- decollate snail
  Rupellaria cancellatum (A. E. Verrill, 1885) -- invalid -- cancellate rupellaria
  Rupellaria carditoides (Conrad, 1837) -- invalid -- hearty rupellaria
  Rupellaria tellimyalis (Carpenter, 1864) -- valid -- thin rupellaria
  Rupellaria typica (Jonas, 1844) -- invalid -- Atlantic rupellaria
  Sabinella troglodytes (Thiele, 1925) -- valid -- pencil-spine eulima
  Sakuraeolis enosimensis (Baba, 1930) -- valid -- white-tentacle Japanese aeolis
  Sanguinolaria cruenta (Lightfoot, 1786) -- valid -- operculate sanguin
  Sanguinolaria sanguinolenta (Gmelin, 1791) -- valid -- Atlantic sanguin
  Sansonia tuberculata (Watson, 1886) -- valid -- tuberculate cyclostreme
  Sarasomia plebeia (P. Fischer, 1898) -- valid -- caribbean leatherleaf
  Saxicavella pacifica Dall, 1916 -- valid -- little saxicave, elongate saxicave
  Saxidomus giganteus (Deshayes, 1839) -- invalid -- butter clam
  Saxidomus nuttalli Conrad, 1837 -- valid -- California butterclam
  Scaeurgus unicirrhus (Chiaie, 1839-41 in Férussac and D'Orbigny, 1834-1848) -- valid -- unicorn octopus, Atlantic warty octopus
  Scalenostoma babylonia Bartsch, 1912 -- valid -- keeled eulima
  Scaphander punctostriatus (Mighels and C. B. Adams, 1842) -- valid -- giant canoe-bubble
  Scaphella gouldiana (Dall, 1887) -- valid -- banded volute
  Scaphella junonia (Lamarck, 1804) -- valid -- junonia
  Scelidotoma bella (Gabb, 1865) -- valid -- elegant emarginula
  Scintillona bellerophon O'Foighil and Gibson, 1984 -- valid -- sea-cucumber clam, sea-cucumber galeommatid
  Scissilabra dalli Bartsch, 1907 -- valid -- splitlip vitrinella
  Scissurella lyra S. S. Berry, 1947 -- valid -- lyre scissurelle
  Scissurella proxima Dall, 1927 -- valid -- Florida scissurelle
  Sclerodoris tanya (Ev. Marcus, 1971) -- valid -- feline doris
  Sconsia striata (Lamarck, 1816) -- valid -- royal bonnet
  Scyllaea pelagica Linnaeus, 1758 -- valid -- sargassum nudibranch
  Seguenzia giovia Dall, 1919 -- valid -- California seguenzia
  Seguenzia monocingulata Sequenza, 1876 -- valid -- pygmy seguenzia
  Semele bellastriata (Conrad, 1837) -- valid -- cancellate semele
  Semele decisa (Conrad, 1837) -- valid -- clipped semele
  Semele incongrua Carpenter, 1864 -- valid -- incongruous semele
  Semele proficua (Pulteney, 1799) -- valid -- Atlantic semele
  Semele pulchra (G. B. Sowerby I, 1832) -- valid -- beautiful semele
  Semele purpurascens (Gmelin, 1791) -- valid -- purplish semele
  Semele rubropicta Dall, 1871 -- valid -- rose-painted semele
  Semele rupicola Dall, 1915 -- valid -- rock semele
  Semelina nuculoides (Conrad, 1841) -- valid -- nut semele
  Sepioteuthis sepioidea (Blainville, 1823) -- valid -- Caribbean reef squid
  Septifer bifurcatus (Conrad, 1837) -- valid -- bifurcate mussel
  Serpulorbis decussatus (Gmelin, 1791) -- valid -- decussate wormsnail
  Serpulorbis squamiger (Carpenter, 1856) -- valid -- scaled wormsnail
  Serripes groenlandicus (Mohr, 1786) -- valid -- Greenland cockle, Greenland smoothcockle
  Serripes laperousii (Deshayes, 1839) -- valid -- broad cockle, broad smoothcockle
  Sigatica carolinensis (Dall, 1889) -- valid -- Carolina moonsnail
  Sigatica semisulcata (J. E. Gray, 1839) -- valid -- semisulcate moonsnail
  Siliqua alta (Broderip and G. B. Sowerby I, 1829) -- valid -- Alaska razor
  Siliqua costata Say, 1822 -- valid -- Atlantic razor
  Siliqua lucida (Conrad, 1837) -- valid -- transparent razor
  Siliqua patula (Dixon, 1789) -- valid -- northern razor, Pacific razor
  Siliqua sloati Hertlein, 1961 -- valid -- sloat razor
  Siliqua squama de Blainville, 1824 -- valid -- rough razor
  Siliquaria squamata Blainville, 1827 -- valid -- slit wormsnail
  Simnialena marferula Cate, 1973 -- valid -- sea-whip simnia
  Simnialena uniplicata (G. B. Sowerby II, 1848) -- valid -- one-tooth simnia
  Simpsonaias ambigua (Say, 1825) -- valid -- salamander mussel
  Sinezona rimuloides (Carpenter, 1865) -- valid -- rim scissurelle
  Sinum debile (Gould, 1853) -- valid -- slight baby ear
  Sinum maculatum (Say, 1831) -- valid -- brown baby ear
  Sinum minus (Dall, 1889) -- valid -- dwarf baby ear
  Sinum perspectivum (Say, 1831) -- valid -- white baby ear
  Sinum scopulosum (Conrad, 1849) -- valid -- fat baby ear
  Siphonaria pectinata (Linnaeus, 1758) -- valid -- striped false limpet
  Siphonodentalium quadrifissatum (Pilsbry and Sharp, 1898) -- valid -- four-slit toothshell, fourslit toothshell
  Skenea californica (Bartsch, 1907) -- valid -- California skenea
  Skenea carmelensis A. G. Smith and M. Gordon, 1948 -- valid -- Carmel skenea
  Skenea concordia (Bartsch, 1920) -- valid -- beaded skenea
  Skenea coronadoensis (Arnold, 1903) -- valid -- Coronado skenea
  Skeneopsis alaskana Dall, 1919 -- valid -- alaska skenea
  Skeneopsis planorbis (Fabricius, 1780) -- valid -- flat skenea
  Smaragdia viridis (Linnaeus, 1758) -- valid -- emerald nerite
  Solariella intermedia (Leche, 1878) -- valid -- intermediate solarelle
  Solariella lacunella (Dall, 1881) -- valid -- channeled solarelle
  Solariella laevis Friele, 1886 -- valid -- smooth solarelle
  Solariella lamellosa (Dall, 1881) -- valid -- lamellose solarelle
  Solariella micraulax J. H. McLean, 1964 -- valid -- fine-groove solarelle
  Solariella nuda Dall, 1896 -- valid -- naked solarelle
  Solariella obscura (Couthouy, 1838) -- valid -- obscure solarelle
  Solariella peramabilis Carpenter, 1864 -- valid -- lovely pacific solarelle, lovely solarelle
  Solariella periscopia Dall, 1927 -- valid -- look-around solarelle
  Solariella rhyssa Dall, 1919 -- valid -- wrinkled solarelle
  Solariella varicosa (Mighels and C. B. Adams, 1842) -- valid -- varicose solarelle
  Solecurtus cumingianus Dunker, 1861 -- valid -- corrugate solecurtus
  Solecurtus sanctaemarthae D'Orbigny, 1842 -- valid -- st. martha solecurrtus, stubby solecurtus
  Solemya borealis Totten, 1834 -- valid -- boreal awningclam
  Solemya grandis A. E. Verrill and Bush, 1898 -- valid -- grand awningclam
  Solemya occidentalis Deshayes, 1857 -- valid -- West Indian awningclam
  Solemya reidi Bernard, 1980 -- valid -- gutless awningclam
  Solemya valvulus (Carpenter, 1864) -- valid -- Pacific awningclam
  Solemya velum Say, 1822 -- valid -- Atlantic awningclam
  Solen obliquus Sprengler, 1794 -- valid -- oblique jackknife clam
  Solen sicarius Gould, 1850 -- valid -- sickle jackknife clam, sickle jackknife
  Solen viridis Say, 1821 -- valid -- green jackknife clam, green jackknife
  Somatogyrus alcoviensis Krieger, 1972 -- valid -- Reverse Pebblesnail
  Somatogyrus amnicoloides Walker, 1915 -- valid -- Ouachita pebblesnail
  Somatogyrus aureus Tryon, 1865 -- valid -- Golden Pebblesnail
  Somatogyrus biangulatus Walker, 1906 -- valid -- Angular Pebblesnail
  Somatogyrus constrictus Walker, 1904 -- valid -- Knotty Pebblesnail
  Somatogyrus coosaensis Walker, 1904 -- valid -- Coosa Pebblesnail
  Somatogyrus crassilabris Walker, 1915 -- valid -- Thick-lip Pebblesnail
  Somatogyrus crassus Walker, 1904 -- valid -- Stocky Pebblesnail
  Somatogyrus currierianus (Lea, 1863) -- valid -- Tennessee Pebblesnail
  Somatogyrus decipiens Walker, 1909 -- valid -- Hidden Pebblesnail
  Somatogyrus depressus (Tryon, 1862) -- valid -- Sandbar Pebblesnail
  Somatogyrus excavatus Walker, 1906 -- valid -- Ovate Pebblesnail
  Somatogyrus georgianus Walker, 1904 -- valid -- Cherokee Pebblesnail
  Somatogyrus hendersoni Walker, 1909 -- valid -- Fluted Pebblesnail
  Somatogyrus hinkleyi Walker, 1904 -- valid -- Granite Pebblesnail
  Somatogyrus humerosus Walker, 1906 -- valid -- Atlas Pebblesnail
  Somatogyrus integra (Say, 1829) -- valid -- Ohio Pebblesnail
  Somatogyrus nanus Walker, 1904 -- valid -- Dwarf Pebblesnail
  Somatogyrus obtusus Walker, 1904 -- valid -- Moon Pebblesnail
  Somatogyrus parvulus Tryon, 1865 -- valid -- Sparrow Pebblesnail
  Somatogyrus pennsylvanicus Walker, 1904 -- valid -- Shale Pebblesnail
  Somatogyrus pilsbryanus Walker, 1904 -- valid -- Tallapoosa Pebblesnail
  Somatogyrus pumilus (Conrad, 1834) -- valid -- Compact Pebblesnail
  Somatogyrus pygmaeus Walker, 1909 -- valid -- Pygmy Pebblesnail
  Somatogyrus quadratus Walker, 1906 -- valid -- Quadrate Pebblesnail
  Somatogyrus rheophilas F. G. Thompson, 1984 -- invalid
  Somatogyrus sargenti Pilsbry, 1895 -- valid -- Mud Pebblesnail
  Somatogyrus strengi Pilsbry and Walker, 1906 -- valid -- Rolling Pebblesnail
  Somatogyrus substriatus Walker, 1906 -- valid -- Choctaw Pebblesnail
  Somatogyrus tenax F. G. Thompson, 1969 -- valid -- Savannah Pebblesnail
  Somatogyrus tennesseensis Walker, 1906 -- valid -- Opaque Pebblesnail
  Somatogyrus tryoni Pilsbry and F. C. Baker, 1927 -- valid -- Coldwater Pebblesnail
  Somatogyrus virginicus Walker, 1904 -- valid -- Panhandle Pebblesnail
  Somatogyrus walkerianus Aldrich, 1905 -- valid -- Gulf Coast Pebblesnail
  Somatogyrus wheeleri Walker, 1915 -- valid -- Channelled Pebblesnail
  Sonorelix angelus (Gregg, 1949) -- valid -- soledad desertsnail
  Sonorelix avawatzica (S. S. Berry, 1930) -- valid -- Avawatz desertsnail
  Sonorelix baileyi (Bartsch, 1904) -- valid -- Resting Spring desertsnail
  Sonorelix borregoensis (S. S. Berry, 1929) -- valid -- Borrego desertsnail
  Sonorelix harperi (Bryant, 1900) -- valid -- Mountain Spring desertsnail
  Sonorelix melanophylon (S. S. Berry, 1930) -- valid -- black rock desertsnail
  Sonorelix rixfordi (Pilsbry, 1919) -- valid -- Joshua Tree desertsnail
  Sonorella allynsmithi Gregg and W. B. Miller, 1969 -- valid -- squaw park talussnail
  Sonorella ambigua Pilsbry and Ferriss, 1915 -- valid -- Papago talussnail
  Sonorella anchana S. S. Berry, 1948 -- valid -- Sierra Ancha talussnail, wreathed cactussnail
  Sonorella animasensis Pilsbry, 1939 -- valid -- Animas talussnail, bicolored cactussnail
  Sonorella apache Pilsbry and Ferriss, 1915 -- valid -- Apache talussnail
  Sonorella ashmuni Bartsch, 1904 -- valid -- Richinbar talussnail
  Sonorella baboquivariensis Pilsbry and Ferriss, 1915 -- valid -- Baboquivari talussnail
  Sonorella bagnarai W. B. Miller, 1967 -- valid -- Rincon talussnail
  Sonorella bartschi Pilsbry and Ferriss, 1915 -- valid -- Escabrosa talussnail
  Sonorella bequaerti W. B. Miller, 1967 -- valid -- Happy Valley talussnail
  Sonorella bicipitis Pilsbry and Ferriss, 1910 -- valid -- Dos Cabezas talussnail
  Sonorella binneyi Pilsbry and Ferriss, 1910 -- valid -- Horseshoe Canyon talussnail
  Sonorella bowiensis Pilsbry, 1905 -- valid -- Quartzite Hill talussnail
  Sonorella caerulifluminis Pilsbry and Ferriss, 1919 -- valid -- Blue talussnail
  Sonorella christenseni Fairbanks and Reeder, 1980 -- valid -- Clark Peak talussnail
  Sonorella clappi Pilsbry and Ferriss, 1915 -- valid -- Madera talussnail
  Sonorella coloradoensis (Stearns, 1890) -- valid -- Grand Canyon talussnail
  Sonorella coltoniana Pilsbry, 1939 -- valid -- Walnut Canyon talussnail
  Sonorella compar Pilsbry, 1919 -- valid -- Oak Creek talussnail
  Sonorella dalli Bartsch, 1904 -- valid -- Garden Canyon talussnail
  Sonorella danielsi Pilsbry and Ferriss, 1910 -- valid -- Bear Canyon talussnail
  Sonorella delicata Pilsbry and Ferriss, 1919 -- valid -- Tollhouse Canyon talussnail
  Sonorella dragoonensis Pilsbry and Ferriss, 1915 -- valid -- Stronghold Canyon talussnail
  Sonorella eremita Pilsbry and Ferriss, 1915 -- valid -- San Xavier talussnail
  Sonorella ferrissi Pilsbry, 1915 -- valid -- Dragoon talussnail
  Sonorella franciscana Pilsbry and Ferriss, 1919 -- valid -- St. Francis talussnail
  Sonorella galiurensis Pilsbry and Ferriss, 1919 -- valid -- Galiuro talussnail
  Sonorella grahamensis Pilsbry and Ferriss, 1919 -- valid -- Pinaleno talussnail
  Sonorella granulatissima Pilsbry, 1902 -- valid -- Ramsey Canyon talussnail
  Sonorella hachitana (Dall, 1896) -- valid -- New Mexico talussnail
  Sonorella huachucana Pilsbry, 1905 -- valid -- Huachuca talussnail
  Sonorella imitator Gregg and W. B. Miller, 1974 -- valid -- mimic talussnail
  Sonorella imperatrix Pilsbry, 1939 -- valid -- Total Wreck talussnail
  Sonorella imperialis Pilsbry and Ferriss, 1923 -- valid -- Empire Mountain talussnail
  Sonorella insignis Pilsbry and Ferriss, 1919 -- valid -- Whetstone talussnail
  Sonorella macrophallus Fairbanks and Reeder, 1980 -- valid -- Wet Canyon talussnail
  Sonorella magdalenensis (Stearns, 1890) -- valid -- Sonoran talussnail
  Sonorella meadi W. B. Miller, 1966 -- valid -- Agua Dulce talussnail
  Sonorella metcalfi W. B. Miller, 1976 -- valid -- Franklin Mountain talussnail
  Sonorella micra Pilsbry and Ferriss, 1910 -- valid -- pygmy talussnail
  Sonorella micromphala Pilsbry, 1939 -- valid -- mik ranch talussnail, Milk Ranch talussnail
  Sonorella milleri Christensen and Reeder, 1981 -- valid -- Table Top talussnail
  Sonorella mustang Pilsbry and Ferriss, 1919 -- valid -- Mustang talussnail
  Sonorella neglecta Gregg, 1951 -- valid -- Portal talussnail
  Sonorella odorata Pilsbry and Ferriss, 1919 -- valid -- pungent talussnail
  Sonorella optata Pilsbry and Ferris, 1910 -- valid -- Big Emigrant talussnail
  Sonorella orientis Pilsbry, 1936 -- valid -- Organ Mountain talussnail
  Sonorella papagorum Pilsbry and Ferriss, 1915 -- valid -- Black Mountain talussnail
  Sonorella parva Pilsbry, 1905 -- valid -- little talussnail
  Sonorella rinconensis Pilsbry and Ferriss, 1910 -- valid -- Posta Quemada talussnail
  Sonorella rooseveltiana S. S. Berry, 1917 -- valid -- roosevelt talussnail
  Sonorella rosemontensis Pilsbry, 1939 -- valid -- Rosemont talussnail
  Sonorella sabinoensis Pilsbry and Ferriss, 1919 -- valid -- Santa Catalina talussnail
  Sonorella santaritana Pilsbry and Ferriss, 1915 -- valid -- aqua caliente talussnail, Agua Caliente talussnail
  Sonorella simmonsi W. B. Miller, 1966 -- valid -- Picacho talussnail
  Sonorella sitiens Pilsbry and Ferriss, 1915 -- valid -- Las Guijas talussnail
  Sonorella superstitionis Pilsbry, 1939 -- valid -- Superstition Mountain talussnail
  Sonorella todseni W. B. Miller, 1976 -- valid -- Dona Ana talussnail
  Sonorella tortillita Pilsbry and Ferriss, 1919 -- valid -- Tortolita talussnail
  Sonorella tryoniana Pilsbry and Ferriss, 1923 -- valid -- Sanford talussnail
  Sonorella vespertina Pilsbry and Ferriss, 1915 -- valid -- evening talussnail
  Sonorella virilis Pilsbry, 1905 -- valid -- Chiricahua talussnail
  Sonorella walkeri Pilsbry and Ferriss, 1915 -- valid -- Santa Rita talussnail
  Sonorella waltoni W. B. Miller, 1968 -- valid -- Doubtful Canyon talussnail
  Sonorella xanthenes Pilsbry and Ferriss, 1923 -- valid -- Kitt Peak talussnail
  Speleodiscoides spirellum A. G. Smith, 1957 -- valid -- glass coil
  Spengleria rostrata (Spengler, 1783) -- valid -- rostrate rocellaria, rostrate gastrochaenid
  Sphaerium corneum (Linnaeus, 1758) -- valid -- European fingernailclam
  Sphaerium fabale (Prime, 1852) -- valid -- river fingernailclam
  Sphaerium nitidum Westerlund, 1876 -- valid -- Arctic fingernailclam
  Sphaerium occidentale (J. Lewis, 1856) -- valid -- Herrington fingernailclam
  Sphaerium patella (Gould, 1850) -- valid -- Rocky Mountain fingernailclam
  Sphaerium rhomboideum (Say, 1822) -- valid -- rhomboid fingernailclam
  Sphaerium simile (Say, 1817) -- valid -- grooved fingernailclam
  Sphaerium striatinum (Lamarck, 1818) -- valid -- striated fingernailclam
  Sphenia antillensis Dall and Simpson, 1901 -- valid -- Antillean sphenia
  Sphenia luticola (Valenciennes, 1846) -- valid -- Pacific sphenia
  Sphenia ovoidea Carpenter, 1864 -- valid -- ovoid sphenia
  Sphenia tumida J. E. Lewis, 1968 -- valid -- tumid sphenia
  Spiculata barbarensis (Dall, 1892) -- valid -- santa barbara simnia
  Spilochlamys conica F. G. Thompson, 1968 -- valid -- Conical Siltsnail
  Spilochlamys gravis F. G. Thompson, 1968 -- valid -- Armored Siltsnail
  Spilochlamys turgida F. G. Thompson, 1969 -- valid -- Pumpkin Siltsnail
  Spiroglyptus annulatus Daudin, 1800 -- valid -- ringed wormsnail
  Spiroglyptus irregularis (d'Orbigny, 1842) -- valid -- irregular wormsnail
  Spiroglyptus lituellus Morch, 1861 -- valid -- flat wormsnail
  Spiroglyptus rastrus (Morch, 1861) -- valid -- california wormsnail
  Spirolaxis centrifuga (di Monterosato, 1890) -- valid -- exquisite false dial, exquisite false-dial
  Spirula spirula (Linnaeus, 1758) -- valid -- ram's horn squid
  Spisula catilliformis Conrad, 1867 -- invalid -- dish surfclam
  Spisula falcata (Gould, 1850) -- invalid -- hooked surfclam
  Spisula hemphillii (Dall, 1894) -- invalid -- Hemphill surfclam
  Spisula planulata (Conrad, 1837) -- invalid -- flat surfclam
  Spisula solidissima (Dillwyn, 1817) -- valid -- Atlantic surfclam
  Spondylus americanus Hermann, 1781 -- valid -- Atlantic thorny oyster
  Spondylus ictericus Reeve, 1856 -- valid -- digitate thorny oyster
  Spurilla chromosoma Cockerell and Eliot, 1905 -- valid -- frosted spurilla
  Spurilla neapolitana (delle Chiaje, 1823) -- valid -- neapolitan spurilla
  Spurilla oliviae (Mcfarland, 1966) -- valid -- red-tentacle spurilla
  Spurwinkia salsa (Pilsbry, 1905) -- valid -- Saltmarsh Hydrobe
  Stagnicola apicina (Lea, 1838) -- valid -- Abbreviate Pondsnail
  Stagnicola bonnevillensis (Call, 1884) -- valid -- Fat-Whorled Pondsnail
  Stagnicola caperata (Say, 1829) -- valid -- Wrinkled Marshsnail
  Stagnicola catascopium (Say, 1867) -- invalid -- Woodland Pondsnail
  Stagnicola elodes (Say, 1821) -- valid -- Marsh Pondsnail
  Stagnicola elrodi (F. C. Baker and J. Henderson, 1933) -- valid -- Flathead Pondsnail
  Stagnicola exilis (Lea, 1834) -- valid -- Flat-Whorled Pondsnail
  Stagnicola gabbi (Tryon, 1865) -- valid -- Striate Pondsnail
  Stagnicola hinkleyi (F. C. Baker, 1906) -- valid -- Rustic Pondsnail
  Stagnicola idahoensis (J. Henderson, 1931) -- valid -- Shortspire Pondsnail
  Stagnicola mighelsi (W. G. Binney, 1865) -- valid -- Bigmouth Pondsnail
  Stagnicola montanensis (F. C. Baker, 1913) -- valid -- Mountain Marshsnail
  Stagnicola neopalustris (F. C. Baker, 1911) -- valid -- Piedmont Pondsnail
  Stagnicola oronoensis (F. C. Baker, 1904) -- valid -- Obese Pondsnail
  Stagnicola petoskeyensis (Walker, 1908) -- valid -- Petoskey Pondsnail
  Stagnicola pilsbryi (Hemphill, 1890) -- valid -- Fish Springs Marshsnail
  Stagnicola traski (Tryon, 1863) -- valid -- Widelip Pondsnail
  Stagnicola utahensis (Call, 1884) -- valid -- Thickshell Pondsnail
  Stagnicola walkeriana F. C. Baker, 1926 -- valid -- Calabash Pondsnail
  Stagnicola woodruffi (F. C. Baker, 1901) -- valid -- Coldwater Pondsnail
  Stenophysa marmorata (Guilding, 1828) -- valid -- marbled aplexa
  Stenophysa maugeriae (J. E. Gray, 1837) -- valid -- tawny aplexa
  Stenotrema altispira (Pilsbry, 1894) -- valid -- highland slitmouth
  Stenotrema angellum Hubricht, 1958 -- valid -- Kentucky slitmouth
  Stenotrema barbatum (G. H. Clapp, 1904) -- valid -- bristled slitmouth
  Stenotrema barbigerum (Redfield, 1856) -- valid -- fringed slitmouth
  Stenotrema blandianum (Pilsbry, 1903) -- valid -- Missouri slitmouth
  Stenotrema brevipila (G. H. Clapp, 1907) -- valid -- Talladega slitmouth
  Stenotrema calvescens Hubricht, 1961 -- valid -- Chattanooga slitmouth
  Stenotrema cohuttense (G. H. Clapp, 1914) -- valid -- Cohutta slitmouth
  Stenotrema deceptum (G. H. Clapp, 1905) -- valid -- Monte Sano slitmouth
  Stenotrema depilatum (Pilsbry, 1895) -- valid -- Great Smoky slitmouth
  Stenotrema edgarianum (I. Lea, 1841) -- valid -- Sequatchie slitmouth
  Stenotrema edvardsi (Bland, 1856) -- valid -- ridge-and-valley slitmouth
  Stenotrema exodon (Pilsbry, 1900) -- valid -- Alabama slitmouth
  Stenotrema florida Pilsbry, 1940 -- valid -- Apalachicola slitmouth
  Stenotrema hirsutum (Say, 1817) -- valid -- hairy slitmouth
  Stenotrema labrosum (Bland, 1862) -- valid -- Ozark slitmouth
  Stenotrema magnafumosum (Pilsbry, 1900) -- valid -- appalachian slitmouth
  Stenotrema maxillatum (Gould, 1848) -- valid -- ridge-lip slitmouth
  Stenotrema pilsbryi (Ferriss, 1900) -- valid -- Rich Mountain slitmouth
  Stenotrema pilula (Pilsbry, 1900) -- valid -- pygmy slitmouth
  Stenotrema simile Grimm, 1971 -- valid -- Bear Creek slitmouth
  Stenotrema spinosum (I. Lea, 1830) -- valid -- carinate slitmouth
  Stenotrema stenotrema (Pfeiffer, 1842) -- valid -- inland slitmouth
  Stenotrema unciferum (Pilsbry, 1900) -- valid -- oachita slitmouth, Ouachita slitmouth
  Stenotrema waldense Archer, 1938 -- valid -- Doaks Creek slitmouth
  Sterkia calamitosa (Pilsbry, 1889) -- valid -- mexican birddrop
  Sterkia clementina (Sterki, 1890) -- valid -- insular birddrop
  Sterkia hemphilli (Sterki, 1890) -- valid -- California birddrop
  Sthenorytis pernobilis (P. Fischer and Bernardi, 1857) -- valid -- noble wentletrap
  Stigmaulax sulcatus (Born, 1778) -- valid -- grooved moonsnail
  Stiliger fuscovittatus Lance, 1962 -- valid -- brown-streak stiliger
  Stiobia nana F. G. Thompson, 1978 -- valid -- Sculpin Snail
  Striatura exigua (Stimpson, 1850) -- valid -- ribbed striate
  Striatura ferrea E. S. Morse, 1864 -- valid -- black striate
  Striatura meridionalis (Pilsbry and Ferriss, 1906) -- valid -- median striate
  Striatura milium (E. S. Morse, 1859) -- valid -- fine-ribbed striate
  Striatura pugentensis (Dall, 1895) -- valid -- northwest striate
  Strigilla carnaria (Linnaeus, 1758) -- valid -- large strigilla
  Strigilla gabbi Olsson and McGinty, 1958 -- valid -- gabb strigilla, rayed strigilla
  Strigilla mirabilis (Philippi, 1841) -- valid -- white strigilla
  Strigilla pisiformis (Linnaeus, 1758) -- valid -- pea strigilla
  Strigilla producta Tryon, 1870 -- valid -- ovate strigilla
  Strigilla pseudocarnaria Boss, 1969 -- valid -- false strigilla
  Strigilla surinamensis Boss, 1972 -- valid -- Surinam strigilla
  Strobilops aeneus Pilsbry, 1926 -- valid -- bronze pinecone
  Strobilops affinis Pilsbry, 1893 -- valid -- eightfold pinecone
  Strobilops hubbardi (A. D. Brown, 1861) -- valid -- flattened pinecone
  Strobilops labyrinthicus (Say, 1817) -- valid -- maze pinecone
  Strobilops texasianus Pilsbry and Ferriss, 1906 -- valid -- southern pinecone
  Strombiformis alaskensis Bartsch, 1917 -- valid -- alaska eulima
  Strombiformis auricinctus Abbott, 1958 -- valid -- gold-stripe eulima
  Strombiformis bifasciatus D'Orbigny, 1842 -- valid -- two-band eulima
  Strombiformis bilineatus Alder, 1848 -- valid -- two-line eulima
  Strombiformis californicus Bartsch, 1917 -- valid -- california eulima
  Strombiformis patula (Dall and Simpson, 1901) -- valid -- largemouth eulima
  Strombus alatus Gmelin, 1791 -- valid -- Florida fighting conch
  Strombus costatus Gmelin, 1791 -- valid -- milk conch
  Strombus gallus Linnaeus, 1758 -- valid -- roostertail conch
  Strombus gigas Linnaeus, 1758 -- valid -- pink or queen conch, queen conch
  Strombus pugilis Linnaeus, 1758 -- valid -- West Indian fighting conch
  Strombus raninus Gmelin, 1791 -- valid -- hawkwing conch
  Strophitus connasaugaensis (Lea, 1858) -- invalid -- Alabama creekmussel
  Strophitus subvexus (Conrad, 1834) -- invalid -- southern creekmussel
  Strophitus undulatus (Say, 1817) -- valid -- creeper
  Stygopyrgus bartonensis Hershler and Longley, 1986 -- valid -- Barton Cavesnail
  Styliola subula (Quoy and Gaimard, 1827) -- valid -- keeled clio
  Stylocheilus citrinus (Rang, 1828) -- valid -- yellow seahare, yellow seacat
  Stylocheilus longicauda (Quoy and Gaimard, 1825) -- valid -- blue-ring seahare, longtail seacat
  Subsimnia bellamaris (S. S. Berry, 1946) -- valid -- pacific simnia
  Subulina octona (Bruguiere, 1792) -- valid -- miniature awlsnail
  Succinea barberi (W. B. Marshall, 1926) -- valid -- Sanibel ambersnail
  Succinea californica P. Fischer and Crosse, 1878 -- valid -- San Tomas ambersnail
  Succinea campestris Say, 1817 -- valid -- crinkled ambersnail
  Succinea chittenangoensis Pilsbry, 1908 -- valid -- appalachian ambersnail, chittenango ovate amber snail
  Succinea floridana Pilsbry, 1905 -- valid -- Florida chalksnail
  Succinea forsheyi I. Lea, 1864 -- valid -- spotted ambersnail
  Succinea gabbi Tryon, 1866 -- valid -- riblet ambersnail
  Succinea greeri Tryon, 1866 -- valid -- dryland ambersnail
  Succinea grosvenori I. Lea, 1864 -- valid -- Santa Rita ambersnail
  Succinea indiana Pilsbry, 1905 -- valid -- xeric ambersnail
  Succinea luteola Gould, 1848 -- valid -- Mexico ambersnail
  Succinea oregonensis I. Lea, 1841 -- valid -- Oregon ambersnail
  Succinea ovalis Say, 1817 -- valid -- oval ambersnail
  Succinea paralia Hubricht, 1983 -- valid -- saltmarsh ambersnail
  Succinea putris (Linnaeus, 1758) -- valid -- European ambersnail
  Succinea rusticana Gould, 1846 -- valid -- rustic ambersnail
  Succinea solastra Hubricht, 1961 -- valid -- Lone Star ambersnail
  Succinea strigata Pfeiffer, 1855 -- valid -- striate ambersnail
  Succinea unicolor Tryon, 1866 -- valid -- squatty ambersnail
  Succinea urbana Hubricht, 1961 -- valid -- urban ambersnail
  Succinea wilsoni I. Lea, 1864 -- valid -- golden ambersnail
  Synaptocochlea picta (d'Orbigny, 1842) -- valid -- painted false stomatella
  Tachyrhynchus erosus (Couthouy, 1838) -- valid -- eroded turretsnail
  Tachyrhynchus lacteolus (Carpenter, 1864) -- valid -- milky turretsnail
  Tagelus affinis (C. B. Adams, 1852) -- valid -- neighbor tagelus
  Tagelus californianus (Conrad, 1837) -- valid -- California tagelus
  Tagelus divisus (Spengler, 1794) -- valid -- purplish tagelus
  Tagelus plebeius (Lightfoot, 1786) -- valid -- stout tagelus
  Tagelus subteres (Conrad, 1837) -- valid -- lesser tagelus
  Tapes philippinarum (A. Adams and Reeve, 1850) -- invalid -- Japanese littleneck
  Tarebia granifera (Lamarck, 1822) -- valid -- quilted melania
  Taringa aivica timia Ev. Marcus and Er. Marcus, 1967 -- valid -- dusky brown taringa
  Tectarius muricatus (Linnaeus, 1758) -- valid -- beaded periwinkle
  Tectininus nodulosus (Pfeiffer, 1839) -- valid -- false pricklywinkle
  Tectonatica pusilla (Say, 1822) -- valid -- miniature moonsnail
  Tectura rosacea (Carpenter, 1864) -- valid -- Pacific rosy limpet
  Tegula aureotincta (Forbes, 1850) -- valid -- gilded tegula
  Tegula brunnea Philippi, 1848 -- valid -- brown tegula
  Tegula eiseni Jordan, 1936 -- valid -- western banded tegula, banded tegula
  Tegula excavata (Lamarck, 1822) -- valid -- green-base tegula
  Tegula fasciata (Born, 1778) -- valid -- silky tegula
  Tegula funebralis (A. Adams, 1855) -- valid -- black tegula
  Tegula gallina (Forbes, 1850) -- valid -- speckled tegula
  Tegula hotessieriana (d'Orbigny, 1842) -- valid -- Caribbean tegula
  Tegula lividomaculata (C. B. Adams, 1845) -- valid -- West Indian tegula
  Tegula montereyi (Kiener, 1850) -- valid -- Monterey tegula
  Tegula pulligo (Gmelin, 1791) -- valid -- dusky tegula
  Tegula regina Stearns, 1892 -- valid -- queen tegula
  Teinostoma biscaynense Pilsbry and McGinty, 1945 -- valid -- Biscayne vitrinella
  Teinostoma supravallatum (Carpenter, 1864) -- valid -- upright vitrinella
  Tellidora cristata (Recluz, 1842) -- valid -- white-crest tellin
  Tellina aequistriata Say, 1824 -- valid -- striate tellin
  Tellina agilis Stimpson, 1857 -- valid -- northern dwarf tellin, northern dwarf-tellin
  Tellina alternata Say, 1822 -- valid -- alternate tellin
  Tellina americana Dall, 1900 -- valid -- American tellin
  Tellina angulosa Gmelin, 1791 -- valid -- angulate tellin
  Tellina bodegensis Hinds, 1845 -- valid -- Bodega tellin
  Tellina candeana D'Orbigny, 1842 -- valid -- cande tellin, wedge tellin
  Tellina carpenteri Dall, 1900 -- valid -- Carpenter tellin
  Tellina colorata Dall, 1900 -- valid -- tinted tellin
  Tellina consobrina D'Orbigny, 1842 -- valid -- consobrine tellin
  Tellina cristallina Spengler, 1798 -- valid -- crystal tellin
  Tellina euvitrea Boss, 1964 -- valid -- shiny tellin
  Tellina exerythra Boss, 1964 -- valid -- bloodless tellin
  Tellina fausta Pulteney, 1799 -- valid -- favored tellin
  Tellina gouldii Hanley, 1846 -- valid -- cuneate tellin
  Tellina guildingii Hanley, 1844 -- valid -- guilding tellin
  Tellina idae Dall, 1891 -- valid -- Ida tellin
  Tellina iris Say, 1822 -- valid -- rainbow tellin
  Tellina juttingae Altena, 1965 -- valid -- jutting tellin
  Tellina laevigata Linnaeus, 1758 -- valid -- smooth tellin
  Tellina lineata Turton, 1819 -- valid -- rose-petal tellin
  Tellina listeri Roding, 1798 -- valid -- speckled tellin
  Tellina lutea W. Wood, 1828 -- valid -- alaska great tellin, Alaska great-tellin
  Tellina magna Spengler, 1798 -- valid -- great tellin
  Tellina martinicensis D'Orbigny, 1842 -- valid -- Martinique tellin
  Tellina mera Say, 1834 -- valid -- pure tellin
  Tellina meropsis Dall, 1900 -- valid -- oval tellin
  Tellina modesta (Carpenter, 1864) -- valid -- plain tellin
  Tellina nitens C. B. Adams, 1845 -- valid -- shiny dwarf tellin, shiny dwarf-tellin
  Tellina nuculoides (Reeve, 1854) -- valid -- salmon tellin
  Tellina paramera Boss, 1964 -- valid -- perfect tellin
  Tellina persica Dall and Simpson, 1901 -- valid -- apricot tellin
  Tellina probina Boss, 1964 -- valid -- slandered tellin
  Tellina punicea Born, 1778 -- valid -- watermelon tellin
  Tellina radiata Linnaeus, 1758 -- valid -- sunrise tellin
  Tellina similis J. Sowerby, 1806 -- valid -- candystick tellin
  Tellina squamifera Deshayes, 1855 -- valid -- crenulate tellin
  Tellina sybaritica Dall, 1881 -- valid -- sybaritic tellin
  Tellina tampaensis Conrad, 1866 -- valid -- Tampa tellin
  Tellina tenella A. E. Verrill, 1874 -- valid -- delicate tellin
  Tellina texana Dall, 1900 -- valid -- say tellin, Texas tellin
  Tellina versicolor DeKay, 1843 -- valid -- many-colored tellin
  Tellina vespuciana (d'Orbigny, 1842) -- valid -- Vespucci tellin
  Tenellia adspersa (Nordmann, 1845) -- valid -- miniature aeolis
  Terebra arcas Abbott, 1954 -- valid -- Arcas auger
  Terebra concava (Say, 1826) -- valid -- concave auger
  Terebra crenifera Deshayes, 1859 -- valid -- western crenate auger
  Terebra dislocata (Say, 1822) -- valid -- eastern auger
  Terebra floridana Dall, 1889 -- valid -- yellow auger
  Terebra glossema Schwengel, 1942 -- valid -- tongue auger
  Terebra nassula Dall, 1889 -- valid -- woven auger
  Terebra pedroana Dall, 1908 -- valid -- San Pedro auger
  Terebra protexta (Conrad, 1846) -- valid -- fine-ribbed auger
  Terebra rushii Dall, 1889 -- valid -- porcelain auger
  Terebra taurina (Lightfoot, 1786) -- valid -- flame auger
  Terebra vinosa Dall, 1889 -- valid -- lilac auger
  Teredo bartschi W. Clapp, 1923 -- valid -- Bartsch shipworm
  Teredo navalis Linnaeus, 1758 -- valid -- naval shipworm
  Teredora malleolus (Turton, 1822) -- valid -- malleate shipworm
  Teskeyostrea weberi (Olsson, 1951) -- valid -- weber oyster, threaded oyster
  Testacella haliotidea Draparnaud, 1801 -- valid -- earshell slug
  Texadina spinctostoma (Abbott and Ladd, 1951) -- invalid -- Narrowmouth Hydrobe
  Thais deltoidea (Lamarck, 1822) -- valid -- deltoid rocksnail
  Thala foveata (Sowerby, 1874) -- valid -- beaded thala
  Thala gratiosa (Reeve, 1845) -- valid -- esteemed miter
  Theba pisana (Muller, 1774) -- valid -- white gardensnail
  Theora lubrica Gould, 1861 -- valid -- Asian semele
  Thordisa bimaculata Lance, 1966 -- valid -- two-spot thordis
  Thordisa rubescens Behrens and R. Henderson, 1981 -- valid -- red thordis
  Thracia adamsi MacGinitie, 1959 -- valid -- adams thracia
  Thracia challisiana Dall, 1915 -- valid -- Challis thracia, pustulose thracia
  Thracia conradi Couthouy, 1839 -- valid -- Conrad thracia, undulate thracia
  Thracia corbuloides Blainville, 1824 -- valid -- corbula thracia
  Thracia curta Conrad, 1837 -- valid -- short thracia
  Thracia devexa G. O. Sars, 1878 -- valid -- sloping thracia
  Thracia distorta Montagu, 1808 -- valid -- distorted thracia
  Thracia morrisoni R. E. Petit, 1964 -- valid -- Morrison thracia, wrinkled thracia
  Thracia myopsis Møller, 1842 -- valid -- Arctic thracia
  Thracia phaseolina (Lamarck, 1822) -- valid -- kidneybean thracia
  Thracia rugosa Lamarck, 1818 -- valid -- rugose thracia
  Thracia septentrionalis Jeffreys, 1872 -- valid -- northern thracia
  Thracia stimpsoni Dall, 1886 -- valid -- Stimpson thracia
  Thracia trapezoides Conrad, 1849 -- valid -- trapezoid thracia
  Thyasira barbarensis (Dall, 1890) -- valid -- santa barbara cleftclam
  Thyasira brevis A. E. Verrill and Bush, 1898 -- valid -- short cleftclam
  Thyasira cygnus Dall, 1916 -- valid -- swan cleftclam
  Thyasira equalis (A. E. Verrill and Bush, 1898) -- valid -- equal cleftclam
  Thyasira eumyaria M. Sars, 1870 -- valid -- mya cleftclam
  Thyasira flexuosa (Montagu, 1803) -- valid -- flexuose cleftclam
  Thyasira gouldii (Philippi, 1845) -- valid -- gould cleftclam
  Thyasira granulosa di Monterosato, 1874 -- valid -- granulose cleftclam
  Thyasira rotunda Jeffreys, 1881 -- valid -- rotund cleftclam
  Thyasira simplex A. E. Verrill and Bush, 1898 -- valid -- simple cleftclam
  Thyasira succisa (Jeffreys, 1876) -- valid -- cut-off cleftclam
  Thyasira trisinuata (d'Orbigny, 1842) -- valid -- atlantic cleftcla, Atlantic cleftclam
  Thysanophora horni (Gabb, 1866) -- valid -- southwestern fringed snail
  Thysanophora plagioptycha (Shuttleworth, 1854) -- valid -- lyrate fringed snail, lyrate fringed-snail
  Thysanoteuthis rhombus Troschel, 1857 -- valid -- diamond squid
  Tivela abaconis Dall, 1902 -- valid -- Abaco tivela
  Tivela floridana Rehder, 1939 -- valid -- Florida tivela
  Tivela mactroides (Born, 1778) -- valid -- trigonal tivela
  Tivela stultorum (Mawe, 1823) -- valid -- Pismo clam
  Tochuina tetraquetra (Pallas, 1788) -- valid -- giant orange tochui
  Tonicia schrammi (Shuttleworth, 1856) -- valid -- gold-flecked chiton
  Tonna galea (Linnaeus, 1758) -- valid -- giant tun
  Tonna maculosa (Dillwyn, 1817) -- valid -- atlantic partridge tun
  Torellia ammonia Dall, 1919 -- valid -- rams-horn hairysnail
  Torellia fimbriata A. E. Verrill and S. Smith, 1882 -- valid -- fringed hairysnail
  Torellia vallonia Dall, 1919 -- valid -- acorn hairysnail
  Torellia vestita Jeffreys, 1867 -- valid -- veiled hairysnail
  Toxolasma corvunculus (Lea, 1868) -- valid -- southern purple lilliput
  Toxolasma cylindrellus (Lea, 1868) -- valid -- pale lilliput, pale lilliput pearly mussel
  Toxolasma lividus Rafinesque, 1831 -- invalid -- purple lilliput
  Toxolasma mearnsi (Simpson, 1900) -- invalid -- western lilliput
  Toxolasma parvus (Barnes, 1823) -- invalid -- lilliput
  Toxolasma paulus (Lea, 1840) -- invalid -- iridescent lilliput
  Toxolasma pullus (Conrad, 1838) -- valid -- Savannah lilliput
  Toxolasma texasensis (Lea, 1857) -- invalid -- Texas lilliput
  Trachycardium egmontianum (Shuttleworth, 1856) -- valid -- Florida pricklycockle
  Trachycardium isocardia (Linnaeus, 1758) -- valid -- even pricklycockle
  Trachycardium magnum (Linnaeus, 1758) -- valid -- magnum pricklycockle
  Trachycardium muricatum (Linnaeus, 1758) -- valid -- yellow pricklycockle
  Trachycardium quadragenarium (Conrad, 1837) -- valid -- spiny pricklycockle
  Trachypollia didyma (Swengel, 1943) -- valid -- twin drupe
  Trachypollia lugubris (C. B. Adams, 1852) -- valid -- dark drupe
  Trachypollia nodulosa (C. B. Adams, 1845) -- valid -- blackberry drupe
  Tralia ovula (Bruguiere, 1789) -- valid -- egg melampus
  Transennella confusa S. Gray, 1982 -- invalid -- confusing transennella
  Transennella conradina Dall, 1884 -- valid -- Conrad transennella, colorful transennella
  Transennella cubaniana (d'Orbigny, 1842) -- valid -- Cuba transennella
  Transennella stimpsoni Dall, 1902 -- valid -- Stimpson transennella, banded transennella
  Transennella tantilla (Gould, 1853) -- valid -- purple transennella
  Tremoctopus violaceus Chiaie, 1830 in 1823-1831 -- valid -- common blanket octopus
  Tresus capax (Gould, 1850) -- valid -- fat gaper
  Trichia hispida (Linnaeus, 1758) -- valid -- hairy helicellid
  Trichia striolata (Pfeiffer, 1828) -- valid -- furrowed helicellid
  Trichotropis bicarinata (G. B. Sowerby I, 1825) -- valid -- two-keel hairysnail
  Trichotropis borealis Broderip and G. B. Sowerby I, 1829 -- valid -- boreal hairysnail
  Trichotropis cancellata Hinds, 1843 -- valid -- cancellate hairysnail
  Trichotropis coronata Gould, 1860 -- valid -- crowned hairysnail
  Trichotropis insignis Middendorff, 1849 -- valid -- gray hairysnail
  Trichotropis migrans Dall, 1881 -- valid -- wandering hairysnail
  Tricolia affinis (C. B. Adams, 1850) -- valid -- checkered pheasant
  Tricolia bella (M. Smith, 1937) -- valid -- shouldered pheasant
  Tricolia compta (Gould, 1855) -- valid -- banded pheasant
  Tricolia cruenta Robertson, 1958 -- valid -- stained pheasant
  Tricolia pterocladica -- valid -- rhodophyte pheasant
  Tricolia pulloides (Carpenter, 1865) -- valid -- sullied pheasant
  Tricolia substriata (Carpenter, 1864) -- valid -- low-line pheasant
  Tricolia thalassicola Robertson, 1958 -- valid -- turtlegrass pheasant
  Tricolia variegata (Carpenter, 1864) -- valid -- red-line pheasant
  Trigoniocardia antillarum (d'Orbigny, 1842) -- valid -- antillean cockle
  Trigonostoma rugosum (Lamarck, 1822) -- valid -- rugose nutmeg
  Trilobopsis loricata (Gould, 1846) -- valid -- scaley chaparral, scaly chaparral
  Trilobopsis penitens (Hanna and Rixford, 1923) -- valid -- Mormon Island chaparral
  Trilobopsis roperi (Pilsbry, 1889) -- valid -- Shasta chaparral
  Trilobopsis tehamana (Pilsbry, 1928) -- valid -- Tehama chaparral
  Trilobopsis trachypepla (S. S. Berry, 1933) -- valid -- Bridge Creek chaparral
  Trimusculus carinatus (Dall, 1870) -- valid -- carinate gadinia
  Trimusculus reticulatus (G. B. Sowerby I, 1835) -- valid -- reticulate gadinia
  Triodopsis alabamensis (Pilsbry, 1902) -- valid -- alabama three-tooth, Alabama threetooth
  Triodopsis albolabris (Say, 1816) -- valid -- whitelip
  Triodopsis alleni (Sampson, 1883) -- valid -- western whitelip
  Triodopsis burchi Hubricht, 1950 -- valid -- pittsylvania three-tooth, Pittsylvania threetooth
  Triodopsis caroliniensis (I. Lea, 1834) -- valid -- blunt wedge
  Triodopsis chadwicki (Ferriss, 1907) -- valid -- kaw whitelip
  Triodopsis claibornensis Lutz, 1950 -- valid -- claiborne three-tooth, Claiborne threetooth
  Triodopsis complanata (Pilsbry, 1898) -- valid -- glossy three-tooth, glossy threetooth
  Triodopsis cragini Call, 1886 -- valid -- post oak three-tooth, Post Oak threetooth
  Triodopsis denotata (Ferussac, 1821) -- valid -- black velvet wedge
  Triodopsis dentifera (A. Binney, 1837) -- valid -- big-tooth whitelip
  Triodopsis discoidea (Pilsbry, 1904) -- valid -- rivercliff three-tooth, rivercliff threetooth
  Triodopsis divesta (Gould, 1848) -- valid -- ozark whitelip
  Triodopsis fallax (Say, 1825) -- valid -- pinhole three-tooth, mimic threetooth
  Triodopsis fosteri (F. C. Baker, 1921) -- valid -- bladetooth wedge
  Triodopsis fradulenta (Pilsbry, 1894) -- valid -- baffled three-tooth, baffled threetooth
  Triodopsis fulcidens Hubricht, 1952 -- valid -- dwarf buttressed three-tooth
  Triodopsis henriettae (Mazyck, 1877) -- valid -- pineywood three-tooth, pineywoods threetooth
  Triodopsis hopetonensis (Shuttleworth, 1852) -- valid -- magnolia three-tooth, magnolia threetooth
  Triodopsis juxtidens (Pilsbry, 1894) -- valid -- atlantic three-tooth, Atlantic threetooth
  Triodopsis lioderma (Pilsbry, 1902) -- valid -- tulsa whitelip
  Triodopsis major (A. Binney, 1937) -- valid -- southeastern whitelip
  Triodopsis maratima (Pilsbry, 1890) -- valid -- coastal whitelip
  Triodopsis messana Hubricht, 1952 -- valid -- pinhole three-tooth, pinhole threetooth
  Triodopsis multilineata (Say, 1821) -- valid -- striped whitelip
  Triodopsis neglecta (Pilsbry, 1899) -- valid -- ozark three-tooth, Ozark threetooth
  Triodopsis obsoleta (Pilsbry, 1894) -- valid -- nubbin three-tooth, nubbin threetooth
  Triodopsis obstricta (Say, 1821) -- valid -- sharp wedge
  Triodopsis occidentalis (Pilsbry and Ferriss, 1894) -- valid -- arkansas wedge
  Triodopsis palustris Hubricht, 1958 -- valid -- santee three-tooth, Santee threetooth
  Triodopsis pendula Hubricht, 1952 -- valid -- hanging rock three-tooth, Hanging Rock threetooth
  Triodopsis picea Hubricht, 1958 -- valid -- spruce knob three-tooth, Spruce Knob threetooth
  Triodopsis platysayoides (Brooks, 1933) -- valid -- cheat three-tooth, flat-spired three-toothed snail, Cheat threetooth
  Triodopsis rugosa Brooks and MacMillan, 1940 -- valid -- buttressed three-tooth, buttressed threetooth
  Triodopsis soelneri (J. B. Henderson, 1907) -- valid -- cape fear three-tooth, Cape Fear threetooth
  Triodopsis tennesseensis (Walker and Pilsbry, 1902) -- valid -- budded three-tooth, budded threetooth
  Triodopsis tridentata (Say, 1816) -- valid -- northern three-tooth, northern threetooth
  Triodopsis vannostrandi (Bland, 1875) -- valid -- tight-coil three-tooth, coiled threetooth
  Triodopsis vulgata Pilsbry, 1940 -- valid -- dished three-tooth, dished threetooth
  Triodopsis vultuosa (Gould, 1848) -- valid -- texas three-tooth, Texas threetooth
  Triopha catalinae (J. G. Cooper, 1863) -- valid -- sea-clown triopha
  Triopha maculata MacFarland, 1905 -- valid -- maculated triopha
  Triopha occidentalis (Fewkes, 1889) -- valid -- grand triopha
  Triphora decorata (C. B. Adams, 1850) -- valid -- mottled triphora
  Triphora melanura (C. B. Adams, 1850) -- valid -- white atlantic triphora
  Triphora nigrocincta (C. B. Adams, 1839) -- valid -- black-line triphora
  Triphora pedroana (Bartsch, 1907) -- valid -- San Pedro triphora
  Triphora pulchella (C. B. Adams, 1850) -- valid -- beautiful triphora
  Triphora turristhomae (Holton, 1802) -- valid -- st. thomas triphora
  Tritogonia verrucosa (Rafinesque, 1820) -- invalid -- pistolgrip
  Tritonia diomedea Bergh, 1894 -- valid -- rosy tritonia
  Tritonia festiva (Stearns, 1873) -- valid -- diamondback tritonia
  Trivia antillarum -- valid -- antilles trivia
  Trivia californiana (Gray, 1827) -- valid -- california trivia
  Trivia candidula Gaskoin, 1835 -- valid -- little white trivia
  Trivia nix (Schilder, 1922) -- valid -- snowy trivia
  Trivia pediculus (Linnaeus, 1758) -- valid -- coffeebean trivia
  Trivia quadripunctata (Gray, 1827) -- valid -- four-spot trivia
  Trivia suffusa (Gray, 1832) -- valid -- pink trivia
  Trochoidea elegans (Gmelin, 1791) -- valid -- elegant helicellid
  Trophonopsis kamchatkana (Dall, 1902) -- valid -- kamchatka trophon
  Truncatella californica Pfeiffer, 1857 -- valid -- California truncatella
  Truncatella caribaeensis Reeve, 1842 -- valid -- Caribbean truncatella
  Truncatella pulchella Pfeiffer, 1839 -- valid -- beautiful truncatella
  Truncatella scalaris (Michaud, 1830) -- valid -- ladder truncatella
  Truncilla cognata (Lea, 1860) -- valid -- Mexican fawnsfoot
  Truncilla donaciformis (Lea, 1828) -- valid -- fawnsfoot
  Truncilla macrodon (Lea, 1859) -- valid -- Texas fawnsfoot
  Truncilla truncata Rafinesque, 1820 -- valid -- deertoe
  Tryonia alamosae Taylor, 1987 -- invalid -- Alamosa Springsnail, Caliente tryonia
  Tryonia cheatumi (Pilsbry, 1935) -- valid -- Phantom Tryonia
  Tryonia clathrata Stimpson, 1865 -- valid -- Grated Tryonia
  Tryonia diaboli (Pilsbry and Ferriss, 1906) -- valid -- Devil Tryonia
  Tryonia imitator (Pilsbry, 1899) -- valid -- Mimic Tryonia
  Tryonia protea (Gould, 1855) -- invalid -- desert tryonia
  Tulotoma magnifica (Conrad, 1834) -- valid -- Alabama live-bearing snail, Tulotoma
  Turbo cailletii P. Fischer and Bernardi, 1856 -- valid -- filose turban
  Turbo canaliculatus Hermann, 1781 -- valid -- channeled turban
  Turbo castanea Gmelin, 1791 -- valid -- chestnut turban
  Turcica caffea (Gabb, 1865) -- valid -- two-tooth topsnail
  Turritella acropora Dall, 1889 -- valid -- boring turretsnail
  Turritella exoleta (Linnaeus, 1758) -- valid -- eastern turretsnail
  Turritella orthosymmetrica S. S. Berry, 1953 -- valid -- symmetrical turretsnail
  Turritella variegata (Linnaeus, 1758) -- valid -- variegate turretsnail
  Turritellopsis acicula (Stimpson, 1851) -- valid -- needle turretsnail
  Turtonia minuta (Fabricius, 1780) -- valid -- minute turton
  Turtonia occidentalis Dall, 1871 -- invalid -- western turton
  Tylodina fungina Gabb, 1865 -- valid -- yellow umbrella slug
  Typhis sowerbii Broderip, 1833 -- valid -- frilly typhis
  Udosarx lyrata Webb, 1959 -- valid -- lyre mantleslug
  Umbraculum umbraculum (Lightfoot, 1786) -- valid -- Atlantic umbrella slug
  Unela remanei Er. Marcus, 1953 -- valid -- sand nudibranch, sand slug
  Uniomerus caroliniana (Bosc, 1801) -- invalid -- Florida pondhorn
  Uniomerus declivis (Say, 1831) -- valid -- tapered pondhorn
  Uniomerus obesus (Lea, 1831) -- invalid -- southern pondhorn
  Uniomerus tetralasmus (Say, 1831) -- valid -- pondhorn
  Urosalpinx cinerea (Say, 1822) -- valid -- Atlantic oyster drill
  Urosalpinx macra A. E. Verrill, 1884 -- valid -- waxy drill
  Urosalpinx perrugata (Conrad, 1846) -- valid -- Gulf oyster drill
  Urosalpinx tampaensis (Conrad, 1846) -- valid -- Tampa drill
  Vallonia albula Sterki, 1893 -- valid -- indecisive vallonia
  Vallonia costata (Muller, 1774) -- valid -- costate vallonia
  Vallonia cyclophorella Sterki, 1892 -- valid -- silky vallonia
  Vallonia excentrica Sterki, 1893 -- valid -- Iroquois vallonia
  Vallonia gracilicosta Reinhardt, 1883 -- valid -- multiribbed vallonia, multirib vallonia
  Vallonia parvula Sterki, 1893 -- valid -- trumpet vallonia
  Vallonia perspectiva Sterki, 1893 -- valid -- thin-lip vallonia
  Vallonia pulchella (Muller, 1774) -- valid -- lovely vallonia
  Valvata bicarinata Lea, 1841 -- valid -- Two-ridge Valvata
  Valvata humeralis Say, 1829 -- valid -- Glossy Valvata
  Valvata lewisi Currier, 1868 -- valid -- Fringed Valvata
  Valvata mergella Westerlund, 1883 -- valid -- Rams-horn Valvata
  Valvata perdepressa Walker, 1906 -- valid -- Purplecap Valvata
  Valvata piscinalis (Muller, 1774) -- valid -- European stream valvata
  Valvata sincera Say, 1824 -- valid -- Mossy Valvata
  Valvata tricarinata (Say, 1817) -- valid -- Threeridge Valvata
  Valvata utahensis Call, 1884 -- valid -- Desert Valvata
  Valvata virens Tryon, 1863 -- valid -- Emerald Valvata
  Valvata winnebagoensis F. C. Baker, 1928 -- valid -- Flanged Valvata
  Vanikoro oxychone Morch, 1877 -- valid -- West Indian vanikoro
  Varicorbula operculata (Philippi, 1848) -- valid -- oval varicorbula
  Vasum muricatum (Born, 1778) -- valid -- Caribbean vase
  Velutina conica Dall, 1887 -- valid -- conical lamellaria
  Velutina granulata Dall, 1919 -- valid -- granular lamellaria
  Velutina lanigera Moller, 1842 -- valid -- wooly lamellaria
  Velutina plicatilis (Muller, 1776) -- valid -- oblique lamellaria
  Velutina prolongata Carpenter, 1864 -- valid -- elongate lamellaria
  Velutina rubra Willett, 1919 -- valid -- red lamellaria
  Velutina undata (T. Brown, 1839) -- valid -- wavy lamellaria
  Velutina velutina (Muller, 1776) -- valid -- smooth lamellaria
  Ventridens acerra (J. Lewis, 1870) -- valid -- glossy dome
  Ventridens arcellus Hubricht, 1976 -- valid -- golden dome
  Ventridens brittsi (Pilsbry, 1892) -- valid -- western dome
  Ventridens cerinoideus (Anthony, 1865) -- valid -- wax dome
  Ventridens coelaxis (Pilsbry, 1899) -- valid -- bidentate dome
  Ventridens collisella (Pilsbry, 1896) -- valid -- sculptured dome
  Ventridens decussatus (Walker and Pilsbry, 1902) -- valid -- crossed dome
  Ventridens demissus (A. Binney, 1843) -- valid -- perforate dome
  Ventridens eutropis Pilsbry, 1946 -- valid -- carinate dome
  Ventridens gularis (Say, 1822) -- valid -- throaty dome
  Ventridens intertextus (A. Binney, 1841) -- valid -- pyramid dome
  Ventridens lasmodon (Phillips, 1841) -- valid -- hollow dome
  Ventridens lawae (W. G. Binney, 1892) -- valid -- rounded dome
  Ventridens ligera (Say, 1821) -- valid -- globose dome
  Ventridens monodon Hubricht, 1964 -- valid -- blade dome
  Ventridens percallosus (Pilsbry, 1898) -- valid -- Tennessee dome
  Ventridens pilsbryi Hubricht, 1964 -- valid -- yellow dome
  Ventridens suppressus (Say, 1829) -- valid -- flat dome
  Ventridens theloides (Walker and Pilsbry, 1902) -- valid -- copper dome
  Ventridens virginicus (Vanatta, 1936) -- valid -- split-tooth dome
  Ventridens volusiae (Pilsbry, 1900) -- valid -- Seminole dome
  Venustaconcha ellipsiformis (Conrad, 1836) -- valid -- ellipse
  Venustaconcha pleasi (Marsh, 1891) -- invalid -- bleedingtooth mussel
  Vermicularia knorrii (Deshayes, 1843) -- valid -- Florida wormsnail
  Vermicularia radicula (Stimpson, 1851) -- valid -- northern wormsnail
  Vermicularia spirata (Philippi, 1836) -- valid -- West Indian wormsnail
  Verticordia acuticostata Philippi, 1884 -- valid -- sharp-ribbed verticord
  Verticordia fischeriana Dall, 1881 -- valid -- fischer verticord
  Verticordia ornata (d'Orbigny, 1842) -- valid -- ornate verticord
  Verticordia seguenzae Dall, 1886 -- valid -- seguenza verticord
  Verticordia trapezoides Sequenza, 1876 -- valid -- trapezoid verticord
  Verticordia woodii E. A. Smith, 1885 -- valid -- wood verticord
  Vertigo alabamensis G. H. Clapp, 1915 -- valid -- Alabama vertigo
  Vertigo allyniana S. S. Berry, 1919 -- valid -- small-tooth vertigo
  Vertigo alpestris Alder, 1838 -- valid -- tundra vertigo
  Vertigo andrusiana Pilsbry, 1899 -- valid -- Pacific vertigo
  Vertigo berryi Pilsbry, 1919 -- valid -- ovate california vertigo, rotund vertigo
  Vertigo binneyana Sterki, 1890 -- valid -- cylindrical vertigo
  Vertigo bollesiana (E. S. Morse, 1865) -- valid -- delicate vertigo
  Vertigo californica (Rowell, 1861) -- valid -- ribbed california vertigo
  Vertigo clappi Brooks and Hunt, 1936 -- valid -- cupped vertigo
  Vertigo columbiana (Pilsbry and Vanatta, 1900) -- valid -- Columbia vertigo
  Vertigo concinnula Cockerell, 1897 -- valid -- mitered vertigo
  Vertigo conecuhensis G. H. Clapp, 1915 -- valid -- Conecuh vertigo
  Vertigo dalliana Sterki, 1890 -- valid -- horseshoe vertigo
  Vertigo elatior Sterki, 1894 -- valid -- tapered vertigo
  Vertigo gouldi (A. Binney, 1843) -- valid -- variable vertigo
  Vertigo hebardi Vanatta, 1912 -- valid -- Keys vertigo
  Vertigo hinkleyi Pilsbry, 1921 -- valid -- heart vertigo
  Vertigo idahoensis Pilsbry, 1934 -- valid -- Idaho vertigo
  Vertigo meramecensis Van Devender, 1979 -- valid -- bluff vertigo
  Vertigo milium (Gould, 1840) -- valid -- blade vertigo
  Vertigo modesta (Say, 1824) -- valid -- cross vertigo
  Vertigo morsei Sterki, 1894 -- valid -- six-whorl vertigo
  Vertigo nylanderi Sterki, 1909 -- valid -- deep-throat vertigo
  Vertigo occidentalis Sterki, 1907 -- valid -- cone cross vertigo, cone vertigo
  Vertigo oralis Sterki, 1898 -- valid -- palmetto vertigo
  Vertigo oscariana Sterki, 1890 -- valid -- capital vertigo
  Vertigo ovata Say, 1822 -- valid -- ovate vertigo
  Vertigo parvula Sterki, 1890 -- valid -- smallmouth vertigo
  Vertigo perryi Sterki, 1905 -- valid -- olive vertigo
  Vertigo pygmaea (Draparnaud, 1801) -- valid -- crested vertigo
  Vertigo rowelli (Newcomb, 1860) -- valid -- threaded vertigo
  Vertigo rugosula Sterki, 1890 -- valid -- striate vertigo
  Vertigo sterkii Pilsbry, 1919 -- valid -- chestnut vertigo
  Vertigo teskeyae Hubricht, 1961 -- valid -- swamp vertigo
  Vertigo tridentata Wolf, 1870 -- valid -- honey vertigo
  Vertigo ventricosa (E. S. Morse, 1865) -- valid -- five-tooth vertigo
  Vertigo wheeleri Pilsbry, 1928 -- valid -- Monte Sano vertigo
  Vesicomya vesica (Dall, 1886) -- valid -- fat vesicomya
  Vespericola armiger (Ancey, 1881) -- valid -- Santa Cruz hesperian
  Vespericola columbianus (I. Lea, 1838) -- valid -- northwest hesperian
  Vespericola haplus (S. S. Berry, 1933) -- valid -- Butte Creek hesperian
  Vespericola karakorum Talmadge, 1962 -- valid -- karok hesperian
  Vespericola megasoma (Pilsbry, 1928) -- valid -- redwood hesperian
  Vespericola pinicola (S. S. Berry, 1916) -- valid -- Monterey hesperian
  Vespericola shasta (S. S. Berry, 1921) -- valid -- Shasta hesperian
  Vespericola sierranus (S. S. Berry, 1921) -- valid -- Siskiyou hesperian
  Vexillum dermestinum (Lamarck, 1811) -- valid -- mottled miter
  Vexillum epiphaneum (Rehder, 1943) -- valid -- half-brown miter
  Vexillum gemmatum (G. B. Sowerby II, 1874) -- valid -- gem miter
  Vexillum histrio (Reeve, 1844) -- valid -- harlequin miter
  Vexillum laterculatum (G. B. Sowerby II, 1874) -- valid -- honeycomb miter
  Vexillum puella (Reeve, 1845) -- valid -- white-spot miter
  Vexillum pulchellum (Reeve, 1844) -- valid -- beautiful miter
  Vexillum styria (Dall, 1889) -- valid -- dwarf deepsea miter
  Vexillum sykesi (Melvill, 1925) -- valid -- white-band miter
  Vexillum wandoense (Holmes, 1860) -- valid -- waxy miter
  Villosa amygdala (Lea, 1843) -- valid -- Florida rainbow
  Villosa arkansasensis (Lea, 1862) -- invalid -- Ouachita creekshell
  Villosa choctawensis Athearn, 1964 -- invalid -- Choctaw bean
  Villosa constricta (Conrad, 1838) -- invalid -- notched rainbow
  Villosa delumbis (Conrad, 1834) -- valid -- eastern creekshell
  Villosa fabalis (Lea, 1831) -- invalid -- rayed bean
  Villosa iris (Lea, 1829) -- invalid -- rainbow
  Villosa lienosa (Conrad, 1834) -- invalid -- little spectacle case, little spectaclecase
  Villosa nebulosa (Conrad, 1834) -- invalid -- Alabama rainbow
  Villosa ortmanni (Walker, 1925) -- invalid -- Kentucky creekshell
  Villosa perpurpurea (Lea, 1861) -- invalid -- purple bean
  Villosa taeniata (Conrad, 1834) -- invalid -- painted creekshell
  Villosa trabalis (Conrad, 1834) -- invalid -- Cumberland bean
  Villosa vanuxemensis umbrans (Lea, 1857) -- invalid -- Coosa creekshell
  Villosa vanuxemensis vanuxemensis (Lea, 1838) -- invalid -- mountain creekshell
  Villosa vaughaniana (Lea, 1838) -- invalid -- Carolina creekshell
  Villosa vibex (Conrad, 1834) -- valid -- southern rainbow
  Villosa villosa (B. H. Wright, 1898) -- valid -- downy rainbow
  Vitrea contracta (Westerlund, 1871) -- valid -- contracted glass-snail
  Vitrina angelicae Beck, 1837 -- valid -- eastern glass-snail
  Vitrina pellucida (Muller, 1774) -- valid -- western glass-snail
  Vitrinella bicaudata Pilsbry and McGinty, 1946 -- valid -- two-tail vitrinella
  Vitrinella filifera Pilsbry and McGinty, 1946 -- valid -- threaded vitrinella
  Vitrinella floridana Pilsbry and McGinty, 1946 -- valid -- Florida vitrinella
  Vitrinella helicoidea C. B. Adams, 1850 -- valid -- helix vitrinella
  Vitrinella praecox Pilsbry and McGinty, 1946 -- valid -- premature vitrinella
  Vitrinella terminalis Pilsbry and McGinty, 1946 -- valid -- terminal vitrinella
  Vitrinella texana D. Moore, 1965 -- valid -- texas vitrinella
  Vitrinorbis diegensis (Bartsch, 1907) -- valid -- San Diego vitrinella
  Viviparus georgianus (Lea, 1834) -- valid -- Banded Mysterysnail
  Viviparus intertextus (Say, 1829) -- valid -- Rotund Mysterysnail
  Viviparus subpurpureus (Say, 1829) -- valid -- Olive Mysterysnail
  Volutharpa ampullacea (Middendorff, 1848) -- valid -- paper whelk
  Volutomitra groenlandica (Moller, 1842) -- valid -- false Greenland miter
  Volutopsius fragilis (Dall, 1891) -- valid -- fragile whelk
  Volutopsius middendorffii (Dall, 1891) -- valid -- tulip whelk
  Volutopsius regularis (Dall, 1873) -- valid -- regular whelk
  Volutopsius trophonius Dall, 1902 -- valid -- frilled whelk
  Volva volva striata (Lamarck, 1810) -- valid -- lined egg spindle
  Volvarina albolineata (d'Orbigny, 1842) -- valid -- white-line marginella
  Volvarina avena (Kiener, 1834) -- valid -- orange-band marginella
  Volvarina subtriplicata (d'Orbigny, 1842) -- valid -- three-rib marginella
  Volvarina taeniolata Morch, 1860 -- valid -- California marginella
  Volvulella californica Dall, 1919 -- valid -- California spindle-bubble
  Volvulella cylindrica (Carpenter, 1864) -- valid -- cylindrical spindle-bubble
  Volvulella panamica Dall, 1919 -- valid -- Panamic spindle-bubble
  Volvulella paupercula (Watson, 1883) -- valid -- spineless spindle-bubble
  Volvulella persimilis (Morch, 1875) -- valid -- southern spindle-bubble
  Volvulella recta (Morch, 1875) -- valid -- spined spindle-bubble
  Volvulella texasiana Harry, 1967 -- valid -- Texas spindle-bubble
  Williamia peltoides (Carpenter, 1864) -- valid -- shield false limpet
  Woodbridgea polystrigma (Dall, 1908) -- valid -- furrowed paper-bubble, furrowed paperbubble
  Xenophora caribaea Petit de la Saussaye, 1857 -- valid -- Caribbean carriersnail
  Xenophora conchyliophora (Born, 1780) -- valid -- American carriersnail
  Xenophora longleyi Bartsch, 1931 -- valid -- shingled carriersnail
  Xerarionta intercisa (W. G. Binney, 1857) -- valid -- plain cactussnail
  Xerarionta kelletti (Forbes, 1850) -- valid -- catalina cactussnail
  Xylophaga atlantica Richards, 1942 -- valid -- Atlantic woodeater
  Xylophaga washingtona Bartsch, 1921 -- valid -- Washington woodeater
  Yoldia amygdalea Valenciennes, 1846 -- valid -- almond yoldia
  Yoldia cooperii Gabb, 1865 -- valid -- Cooper yoldia
  Yoldia hyperborea (Gould, 1841) -- valid -- northern yoldia
  Yoldia limatula (Say, 1831) -- valid -- file yoldia
  Yoldia martyria Dall, 1897 -- valid -- witness yoldia
  Yoldia myalis (Couthouy, 1838) -- valid -- oval yoldia
  Yoldia regularis A. E. Verrill, 1884 -- valid -- regular yoldia
  Yoldia sapotilla (Gould, 1841) -- valid -- short yoldia
  Yoldia scissurata Dall, 1897 -- valid -- crisscrossed yoldia
  Yoldia seminuda Dall, 1871 -- valid -- halfsmooth yoldia, oblique-lined yoldia
  Yoldiella dissimilis (A. E. Verrill and Bush, 1898) -- valid -- different yoldia
  Yoldiella fraterna (Verrill and Bush, 1898) -- valid -- sibling yoldia
  Yoldiella frigida (Torell, 1859) -- valid -- frigid yoldia
  Yoldiella inconspicua (A. E. Verrill and Bush, 1898) -- valid -- inconspicuous yoldia
  Yoldiella inflata (Verrill and Bush, 1897) -- valid -- inflated yoldia
  Yoldiella intermedia (M. Sars, 1865) -- valid -- intermediate yoldia
  Yoldiella iris (Verrill and Bush, 1897) -- valid -- arainbow yoldia
  Yoldiella lenticula (Moller, 1842) -- valid -- lenticulate yoldia
  Yoldiella lucida (Loven, 1846) -- valid -- iridescent yoldia
  Yoldiella sanesia (Dall, 1916) -- valid -- sanesia yoldia
  Yoldiella subangulata (Verrill and Bush, 1898) -- valid -- subangular yoldia
  Zachrysia auricoma (Ferussac, 1821) -- valid -- golden zachrysia
  Zachrysia provisoria (Pfeiffer, 1858) -- valid -- cuba garden zachrysia, garden zachrysia
  Zacoleus idahoensis Pilsbry, 1903 -- valid -- idaho sheathed slug, sheathed slug
  Zebina browniana (d'Orbigny, 1842) -- valid -- smooth risso
  Zirfaea crispata (Linnaeus, 1758) -- valid -- atlantic great piddock, great piddock
  Zirfaea pilsbryi Lowe, 1931 -- valid -- Pilsbry piddock
  Zonitoides arboreus (Say, 1816) -- valid -- quick gloss
  Zonitoides elliotti (Redfield, 1856) -- valid -- green dome
  Zonitoides kirbyi R. W. Fullington, 1974 -- valid -- shadow gloss
  Zonitoides lateumbilicatus (Pilsbry, 1895) -- valid -- striate gloss
  Zonitoides limatulus (A. Binney, 1840) -- valid -- dull gloss
  Zonitoides nitidus (Muller, 1774) -- valid -- black gloss
  Zonitoides patuloides (Pilsbry, 1895) -- valid -- Appalachian gloss
  Zoogenetes harpa (Say, 1824) -- valid -- boreal top
   

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