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Publication: Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, et al. 1998. Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks, 2nd ed. American Fisheries Society Special Publication 26. 526.

ITIS records citing this publication
 
 Kingdom Animalia
  Abra Lamarck, 1818 -- valid
  Abra aequalis (Say, 1822) -- valid -- Atlantic abra
  Abra lioica (Dall, 1881) -- valid -- smooth abra
  Abra longicallis Sacchi, 1836 -- valid -- long abra
  Abra longicallis americana A. E. Verrill and Bush, 1898 -- valid -- long abra
  Acanthina Fischer de Waldheim, 1807 -- valid
  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 Gray, 1821 -- valid
  Acanthochitona andersoni Watters, 1981 -- invalid -- smooth glass-hair chiton
  Acanthochitona angelica Dall, 1919 -- valid
  Acanthochitona avicula (Carpenter, 1864) -- valid
  Acanthochitona balesae Abbott, 1954 -- valid -- slender glass-hair chiton
  Acanthochitona hemphilli (Pilsbry, 1893) -- valid -- red glass-hair chiton
  Acanthochitona imperatrix Watters, 1981 -- valid
  Acanthochitona pygmaea (Pilsbry, 1893) -- valid -- striate glass-hair chiton
  Acanthochitona roseojugum Lyons, 1988 -- valid
  Acanthochitona zebra Lyons, 1988 -- valid
  Acanthochitonida -- invalid
  Acanthochitonidae Pilsbry, 1893 -- valid
  Acanthodoris Gray, 1850 -- valid
  Acanthodoris armata O'Donoghue, 1927 -- valid
  Acanthodoris atrogriseata O'Donoghue, 1927 -- valid
  Acanthodoris brunnea MacFarland, 1905 -- valid -- brown spiny doris
  Acanthodoris caerulescens Bergh, 1880 -- valid
  Acanthodoris hudsoni MacFarland, 1905 -- valid
  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 Guilding, 1829 -- valid
  Acanthopleura granulata (Gmelin, 1791) -- valid -- West Indian fuzzy chiton
  Acanthotrophon Hertlein and Strong, 1951 -- valid
  Acanthotrophon striatoides Vokes, 1980 -- valid -- knobbed trophon
  Acar Gray, 1857 -- valid
  Acar bailyi Bartsch, 1931 -- valid -- miniature ark
  Acella Haldeman, 1841 -- valid
  Acella haldemani (W. G. Binney, 1867) -- valid -- spindle lymnaea
  Acesta excavata (Fabricius, 1779) -- invalid
  Acila H. Adams and A. Adams, 1858 -- valid
  Acila castrensis (Hinds, 1843) -- valid -- divaricate nutclam
  Acirsa Morch, 1857 -- valid
  Acirsa borealis (Lyell, 1841) -- valid -- chalky wentletrap
  Acirsa costulata Mighels and Adams, 1842 -- invalid
  Aclididae G. O. Sars, 1878 -- valid
  Aclis Loven, 1846 -- valid
  Aclis carolinensis Bartsch, 1911 -- valid -- Carolina aclis
  Aclis eolis Bartsch, 1947 -- valid
  Aclis fernamdinae Dall, 1927 -- invalid
  Aclis hendersoni Dall, 1927 -- valid -- angular aclis
  Aclis hypergonia Scwengel and Mcginty, 1942 -- invalid -- angular aclis
  Aclis occidentalis (Hemphill, 1894) -- valid -- Pacific aclis
  Aclis shepardiana Dall, 1919 -- valid
  Aclis tanneri (Bartsch, 1947) -- invalid
  Aclis tenuis A. E. Verrill, 1882 -- valid -- thin aclis
  Aclis turrita (Carpenter, 1864) -- valid -- turreted aclis
  Aclis underwoodae (Bartsch, 1947) -- invalid
  Aclis walleri Jeffreys, 1867 -- valid
  Aclistothyra McGinty, 1955 -- valid
  Aclistothyra atlantica McGinty, 1955 -- valid -- Atlantic galeommatid
  Acmaea Eschscholtz, 1833 -- valid
  Acmaea mitra Eschscholtz, 1833 -- valid -- whitecap limpet
  Acmaeidae Carpenter, 1857 -- valid
  Acochlidioidea -- valid
  Acroloxidae Thiele, 1931 -- valid -- capshells
  Acroloxus Beck, 1837 -- valid
  Acroloxus coloradensis (J. Henderson, 1930) -- valid -- Rocky Mountain capshell
  Acteocina Gray, 1847 -- valid
  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 candei (d'Orbigny, 1841) -- valid
  Acteocina carinata (Carpenter, 1856) -- valid -- keeled barrel-bubble
  Acteocina cerealis (Gould, 1853) -- valid -- grain barrel-bubble
  Acteocina culcitella (Gould, 1853) -- valid -- pillow barrel-bubble
  Acteocina eximia (Baird, 1863) -- valid -- intermediate barrel-bubble
  Acteocina harpa (Dall, 1871) -- valid -- harp baby-bubble
  Acteocina inculta (Gould, 1855) -- valid -- rude barrel-bubble
  Acteocina lepta Woodring, 1928 -- valid
  Acteocina magdalensis (Dall, 1919) -- valid -- Magdalena barrel-bubble
  Acteocina oldroydi Dall, 1925 -- valid
  Acteocina oryza (Totten, 1835) -- valid -- rice barrel-bubble
  Acteocina recta (d'Orbigny, 1841) -- valid -- straight barrel-bubble
  Acteocina smirna Dall, 1919 -- valid
  Acteon Montfort, 1810 -- valid
  Acteon candens Rehder, 1939 -- valid
  Acteon traskii Stearns, 1898 -- valid
  Acteonidae Orbigny, 1842 -- valid
  Actinocyclidae -- valid
  Actinonaias Crosse & Fischer, 1894 -- valid
  Actinonaias ligamentina (Lamarck, 1819) -- invalid -- mucket
  Actinonaias pectorosa (Conrad, 1834) -- invalid -- pheasantshell
  Adalaria Bergh, 1879 -- valid
  Adalaria jannae Millen, 1987 -- valid
  Adalaria proxima (Alder and Hancock, 1854) -- valid -- false doris, yellow false doris
  Adalaria tschuktschica Krause, 1885 -- valid
  Addisonia Dall, 1882 -- valid
  Addisonia brophyi J. H. McLean, 1985 -- valid
  Addisonia excentrica (Tiberi, 1857) -- valid
  Addisoniidae Dall, 1882 -- valid
  Admete Moller, 1842 -- valid
  Admete californica (Dall, 1908) -- valid -- California admete
  Admete circumcincta (Dall, 1873) -- invalid -- corded admete
  Admete gracilior (Carpenter, 1869) -- valid -- slender admete
  Admete laevior Leche, 1878 -- valid
  Admete modesta (Carpenter, 1864) -- invalid -- modest admete
  Admete regina Dall, 1911 -- valid -- noble admete
  Admete rhyssa Dall, 1919 -- invalid -- wrinkled admete
  Admete seftoni S. S. Berry, 1956 -- invalid -- stubby admete
  Admete unalashkensis (Dall, 1873) -- invalid -- Aleutian admete
  Admete viridula (Fabricius, 1780) -- valid -- northern admete
  Admete woodworthi Dall, 1905 -- invalid -- graceful admete
  Adontorhina Berry, 1947 -- valid
  Adontorhina cyclia S. S. Berry, 1947 -- valid -- circle axinopsid
  Adontorhina sphaericosa Scott, 1986 -- valid -- inflated axinopsid
  Adula H. Adams and A. Adams, 1857 -- valid
  Adula californiensis (Philippi, 1847) -- valid -- California datemussel
  Adula diegensis (Dall, 1911) -- valid -- San Diego datemussel
  Adula gruneri (Philippi, 1851) -- valid -- curved datemussel
  Adula schmidtii (Schrenck, 1867) -- valid -- Schmidt datemussel
  Aegires Lovén, 1844 -- valid
  Aegires albopunctatus MacFarland, 1905 -- valid -- salt-and-pepper doris
  Aegires sublaevis Odhner, 1932 -- valid
  Aeolidia Cuvier, 1797 -- valid
  Aeolidia papillosa (Linnaeus, 1761) -- valid -- shag-rug aeolis
  Aeolidiella Bergh, 1867 -- valid
  Aeolidiella chromosoma (Cockerell, 1905) -- valid -- frosted spurilla
  Aeolidiella indica Bergh, 1888 -- valid -- vermillion Japanese aeolis
  Aeolidiella olivae MacFarland, 1966 -- valid -- red-tentacle spurilla
  Aeolidiidae Orbigny, 1834 -- valid
  Aequipecten P. Fischer, 1886 -- valid
  Aequipecten acanthodes (Dall, 1925) -- invalid -- thistle scallop
  Aequipecten exasperatus Sowerby, 1842 -- invalid
  Aequipecten glyptus (A. E. Verrill, 1882) -- valid -- red-ribbed scallop
  Aequipecten muscosus (W. Wood, 1828) -- invalid -- rough scallop
  Aesopus Gould, 1860 -- valid
  Aesopus chrysalloideus (Carpenter, 1864) -- valid -- cocoon dovesnail
  Aesopus eurytoideus (Carpenter, 1864) -- valid
  Aesopus myrmecoon Dall, 1916 -- valid -- ant-egg dovesnail
  Aesopus sanctus Dall, 1919 -- valid -- Santa Monica dovesnail
  Aesopus stearnsii (Tryon, 1883) -- valid
  Aesopus subturritus (Carpenter, 1864) -- valid -- graceful dovesnail
  Aforia Dall, 1889 -- valid
  Aforia circinata (Dall, 1873) -- valid -- keeled aforia
  Agathotoma Cossmann, 1889 -- valid
  Agathotoma candidissima (C. B. Adams, 1845) -- valid
  Agathotoma densestriata (C. B. Adams, 1850) -- valid
  Agathotoma stellata (Morch, 1860) -- valid
  Agatrix R. Petit, 1967 -- valid
  Agatrix agassizii (Dall, 1889) -- valid -- Agassiz's nutmeg
  Aglaja Renier, 1804 -- valid
  Aglaja ocelligera (Bergh, 1893) -- valid -- eyespot aglaja
  Aglajidae -- valid
  Agriopoma Dall, 1902 -- valid
  Agriopoma texasianum (Dall, 1892) -- valid -- texas venus
  Akera Muller, 1776 -- valid
  Akera thompsoni Olsson and McGinty, 1951 -- valid
  Akeridae Pilsbry, 1893 -- valid
  Akiodoris Bergh, 1879 -- valid
  Akiodoris lutescens Bergh, 1880 -- valid
  Alaba H. Adams and A. Adams, 1853 -- valid
  Alaba incerta (d'Orbigny, 1842) -- valid -- varicose cerith
  Alaba jeanettae Bartsch, 1910 -- valid
  Alasmidonta Say, 1818 -- valid
  Alasmidonta arcula (Lea, 1838) -- valid -- Altamaha arcmussel
  Alasmidonta atropurpurea (Rafinesque, 1831) -- valid -- Cumberland elktoe
  Alasmidonta heterodon (Lea, 1829) -- valid -- 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 triangulata (Lea, 1858) -- valid -- southern elktoe
  Alasmidonta undulata (Say, 1817) -- valid -- triangle floater
  Alasmidonta varicosa (Lamarck, 1819) -- valid -- brook floater
  Alasmidonta viridis (Rafinesque, 1820) -- valid -- slippershell mussel
  Alasmidonta wrightiana (Walker, 1901) -- valid -- Ochlockonee arcmussel
  Alcadia Gray, 1840 -- valid
  Alcadia striata (Lamarck, 1822) -- valid -- striate drop
  Alderia Allman, 1845 -- valid
  Alderia modesta (Loven, 1844) -- valid -- modest alderia
  Aldisa Bergh, 1878 -- valid
  Aldisa albomarginata Millen, 1984 -- valid
  Aldisa cooperi Robilliard and Baba, 1972 -- valid
  Aldisa sanguinea (J. G. Cooper, 1863) -- valid -- blood-spot doris
  Aldisa tara Millen, 1984 -- valid
  Aldisa zetlandica (Alder and Hancock, 1854) -- valid
  Aldisidae -- valid
  Alexania Strand, 1928 -- valid
  Alexania floridana (Pilsbry, 1945) -- valid -- smooth wentletrap
  Alia H. Adams and A. Adams, 1853 -- valid
  Alia carinata (Hinds, 1844) -- valid -- carinate dovesnail
  Alia tuberosa (Carpenter, 1864) -- valid -- variegate dovesnail
  Aligena I. Lea, 1843 -- valid
  Aligena elevata (Stimpson, 1851) -- valid -- eastern aligena
  Aligena texasiana Harry, 1969 -- valid -- Texas aligena
  Allogona Pilsbry, 1939 -- valid
  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
  Allopeas H. B. Baker, 1935 -- valid
  Allopeas clavulinum (Potiez and Michaud, 1838) -- valid -- spike awlsnail
  Allopeas gracile (Hutton, 1834) -- valid -- graceful awlsnail
  Allopeas mauritianum (Pfeiffer, 1852) -- valid -- Mauritian awlsnail
  Alvania Risso, 1826 -- valid
  Alvania areolata Stimpson, 1851 -- valid
  Alvania auberiana (d'Orbigny, 1842) -- valid -- West Indian alvania, West Indian alvania
  Alvania castanea Moller, 1842 -- invalid
  Alvania compacta (Carpenter, 1864) -- valid
  Alvania latior (Mighels and C. B. Adams, 1842) -- valid
  Alvania microglypta Haas, 1943 -- valid -- fine-cut alvania
  Alvania moerchi (Collins, 1886) -- valid
  Alvania oldroydae Bartsch, 1911 -- valid
  Alvania precipitata (Dall, 1889) -- valid
  Alvania pseudoareolata Waren, 1974 -- valid
  Alvania rosana Bartsch, 1911 -- valid -- Santa Rosa alvania
  Alvania trachisma Bartsch, 1911 -- valid
  Alvania tumida Carpenter, 1857 -- valid
  Amaea H. Adams and A. Adams, 1854 -- valid
  Amaea mitchelli (Dall, 1896) -- valid
  Amaea retifera (Dall, 1889) -- valid -- reticulate wentletrap
  Amathinidae -- valid
  Amauropsis Mörch, 1857 -- valid
  Amauropsis islandica (Gmelin, 1791) -- valid -- Iceland moonsnail
  Amblema Rafinesque, 1820 -- valid
  Amblema elliottii (Lea, 1856) -- valid -- Coosa fiveridge
  Amblema neislerii (Lea, 1858) -- valid -- fat three-ridge, fat threeridge
  Amblema plicata (Say, 1817) -- valid -- three-ridge, threeridge
  Amblema plicata perplicata (Conrad, 1841) -- invalid -- roundlake
  Amblema plicata plicata (Say, 1817) -- invalid -- three-ridge
  Americardia Stewart, 1930 -- valid
  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
  Americhiton Watters, 1990 -- valid
  Americhiton andersoni (Watters, 1981) -- valid -- smooth glass-hair chiton
  Amiantis Carpenter, 1884 -- valid
  Amiantis callosa (Conrad, 1837) -- valid -- white venus
  Amicula Gray, 1847 -- valid
  Amicula amiculata (Pallas, 1787) -- valid
  Amicula pallasii (Middendorff, 1847) -- valid
  Amicula vestita (Broderip and G. B. Sowerby I, 1829) -- valid
  Ammonitella J. G. Cooper, 1868 -- valid
  Ammonitella yatesii (J. G. Cooper, 1968) -- valid -- tight coin
  Amnicola Gould and Haldeman, 1840 -- valid
  Amnicola clarki Pilsbry, 1917 -- invalid
  Amnicola cora Hubricht, 1979 -- valid -- Foushee Cavesnail
  Amnicola dalli (Pilsbry and Beecher, 1892) -- valid -- Peninsula Amnicola
  Amnicola decisus Haldeman, 1845 -- valid
  Amnicola limosus (Say, 1817) -- valid -- Mud Amnicola
  Amnicola rhombostoma F. G. Thompson, 1968 -- valid -- Squaremouth Amnicola
  Amnicola stygius Hubricht, 1971 -- valid -- Stygian Amnicola
  Amphigyra Pilsbry, 1906 -- valid
  Amphigyra alabamensis Pilsbry, 1906 -- valid -- Shoal Sprite
  Amphissa H. Adams and A. Adams, 1853 -- valid
  Amphissa acutecostata (Philippi, 1844) -- valid
  Amphissa bicolor Dall, 1892 -- valid -- two-tone amphissa
  Amphissa columbiana Dall, 1916 -- valid -- wrinkled amphissa
  Amphissa cymata Dall, 1916 -- valid -- wavy amphissa
  Amphissa reticulata Dall, 1916 -- valid -- reticulate amphissa
  Amphissa undata (Carpenter, 1864) -- valid
  Amphissa versicolor Dall, 1871 -- valid -- variegate amphissa
  Amphithalamus Carpenter, 1864 -- valid
  Amphithalamus inclusus Carpenter, 1864 -- valid
  Amphithalamus vallei Aguayo and Jaume, 1947 -- valid
  Ampullariidae Gray, 1824 -- valid
  Amusium Roding, 1798 -- valid
  Amusium papyraceum (Gabb, 1873) -- valid -- paper scallop
  Amygdalum Megerle von Muhlfeld, 1811 -- valid
  Amygdalum papyrium (Conrad, 1846) -- valid -- Atlantic papermussel
  Amygdalum politum (A. E. Verrill and S. Smith, 1880) -- valid -- polished papermussel
  Amygdalum sagittatum Rehder, 1934 -- valid -- arrow papermussel
  Anadara Gray, 1847 -- valid
  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
  Anadara tuberculosa (G. B. Sowerby I, 1833) -- valid -- pustulose ark
  Anadenulus Cockerell, 1890 -- valid
  Anadenulus cockerelli (Hemphill, 1890) -- valid -- American keeled slug
  Anaspidea -- valid
  Anatina Schumacher, 1817 -- valid
  Anatina anatina (Spengler, 1802) -- valid -- smooth duckclam
  Anatoma Fleming, 1828 -- valid
  Anatoma baxteri J. H. McLean, 1984 -- valid
  Anatoma crispata (Fleming, 1828) -- valid -- crispate scissurelle
  Anatoma lyra (S. S. Berry, 1947) -- valid -- lyre scissurelle
  Anatoma obtusata (Golikov and Gulbin, 1977) -- valid
  Ancistrobasis Dall, 1889 -- valid
  Ancistrobasis depressa (Dall, 1889) -- valid -- depressed basilissa
  Ancistrolepis Dall, 1894 -- valid
  Ancistrolepis beringianus Dall, 1919 -- valid
  Ancistrolepis eucosmius (Dall, 1891) -- valid -- corded whelk
  Ancotrema H. B. Baker, 1931 -- valid
  Ancotrema hybridum (Ancey, 1888) -- valid -- Oregon lancetooth
  Ancotrema sportella (Gould, 1846) -- valid -- beaded lancetooth
  Ancotrema voyanum (Newcomb, 1865) -- valid -- hooded lancetooth
  Ancotrema zopherum Roth, 1990 -- valid -- dusky lancetooth
  Ancula Loven, 1846 -- valid
  Ancula evelinae Er. Marcus, 1961 -- valid
  Ancula gibbosa (Risso, 1818) -- valid -- Atlantic ancula
  Ancula lentiginosa Farmer, 1964 -- valid -- freckled ancula
  Ancula pacifica MacFarland, 1905 -- valid -- Pacific ancula
  Ancylidae Rafinesque, 1815 -- invalid
  Anguispira E. S. Morse, 1864 -- valid
  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 macneilli Walker, 1928 -- valid -- Tombigbee tigersnail
  Anguispira mordax (Shuttleworth, 1852) -- valid -- appalachian disc, Appalachian tigersnail
  Anguispira nimapuna H. B. Baker, 1932 -- valid -- Nimapu tigersnail, nimapuna disc
  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 Colosi, 1922 -- valid
  Angustipes ameghini (Gambetta, 1923) -- valid -- black-velvet leatherleaf
  Anidolyta Willan, 1987 -- valid
  Anidolyta spongotheras (Bertsch, 1980) -- valid
  Anisodonta Deshayes, 1858 -- valid
  Anisodonta carolina Dall, 1900 -- valid -- Carolina sportella
  Anisodoris Bergh, 1898 -- valid
  Anisodoris lentiginosa Millen, 1982 -- valid -- mottled pale sea-lemon
  Anisodoris nobilis (MacFarland, 1905) -- valid -- Pacific sea-lemon
  Anisodoris worki Ev. Marcus and Er. Marcus, 1967 -- valid
  Annulariidae -- valid
  Anodonta Lamarck, 1799 -- valid
  Anodonta beringiana Middendorff, 1851 -- valid -- Yukon floater
  Anodonta californiensis Lea, 1852 -- valid -- California floater
  Anodonta cataracta Say, 1817 -- invalid
  Anodonta cataracta cataracta Say, 1817 -- invalid -- eastern floater
  Anodonta cataracta fragilis Lamarck, 1819 -- invalid -- Newfoundland floater
  Anodonta cataracta marginata Say, 1817 -- invalid -- Gaspe floater
  Anodonta couperiana Lea, 1840 -- invalid -- barrel floater
  Anodonta dejecta Lewis, 1875 -- valid -- woebegone floater
  Anodonta heardi Gordon & Hoeh, 1995 -- invalid -- Apalachicola floater
  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
  Anodonta wahlametensis (Lea, 1838) -- invalid
  Anodontia Link, 1807 -- valid
  Anodontia alba Link, 1807 -- valid -- buttercup lucine
  Anodontia philippiana (Reeve, 1850) -- valid -- chalky buttercup lucine
  Anodontoides Simpson in F.C. Baker, 1898 -- valid
  Anodontoides ferussacianus (Lea, 1834) -- valid -- cylindrical papershell
  Anodontoides radiatus (Conrad, 1834) -- valid -- rayed creekshell
  Anomalocardia Schumacher, 1817 -- valid
  Anomalocardia auberiana (d'Orbigny, 1842) -- valid -- pointed venus
  Anomalocardia brasiliana (Gmelin, 1791) -- valid -- Carib pointed-venus
  Anomia Linnaeus, 1758 -- valid
  Anomia peruviana d'Orbigny, 1846 -- valid -- Peruvian jingle
  Anomia simplex D'Orbigny, 1842 -- valid -- common jingle
  Anomia squamula Linnaeus, 1758 -- valid -- prickly jingle
  Anomiidae Rafinesque, 1815 -- valid
  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 entale (Linnaeus, 1758) -- 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 Pilsbry and McGinty, 1946 -- valid
  Anticlimax athleenae (Pilsbry and McGinty, 1946) -- valid
  Anticlimax pilsbryi (McGinty, 1945) -- valid -- cupola vitrinella
  Antillophos Woodring, 1928 -- valid
  Antillophos beauii (P. Fischer and Bernardi, 1857) -- valid
  Antillophos candeanus (d'Orbigny, 1842) -- valid -- beaded phos
  Antillophos candei (d'Orbigny, 1848) -- invalid -- beaded phos
  Antiopella barbarensis (J. G. Cooper, 1863) -- invalid -- cockscomb nudibranch
  Antiopella mucloc Er. Marcus, 1958 -- invalid
  Antiplanes Dall, 1902 -- valid
  Antiplanes abarbareus Dall, 1919 -- valid
  Antiplanes briseis Dall, 1919 -- valid
  Antiplanes bulimoides Dall, 1919 -- valid
  Antiplanes catalinae (Raymond, 1904) -- valid
  Antiplanes litus Dall, 1919 -- valid
  Antiplanes motojimai (Habe, 1958) -- valid
  Antiplanes motojimai aquilonalis Kantor and Sysoev, 1991 -- valid
  Antiplanes perversus (Gabb, 1865) -- invalid
  Antiplanes sanctiioannis (E. A. Smith, 1875) -- valid
  Antiplanes thalea (Dall, 1902) -- valid
  Antiplanes vinosus (Dall, 1874) -- valid
  Antrobia Hubricht, 1971 -- valid
  Antrobia culveri Hubricht, 1971 -- valid -- Tumbling Creek Cavesnail
  Antrorbis Hershler and F. G. Thompson, 1990 -- valid
  Antrorbis breweri Hershler and F. G. Thompson, 1990 -- valid -- Conical Siltsnail
  Antroselates Hubricht, 1963 -- valid
  Antroselates spiralis Hubricht, 1963 -- valid -- Shaggy Cavesnail
  Antroselatus Hubricht, 1963 -- invalid
  Aorotrema Schwengel and McGinty, 1942 -- valid
  Aorotrema cistronium (Dall, 1889) -- valid
  Aorotrema pontogenes (Schwengel and McGinty, 1942) -- valid
  Aperiovula Cate, 1973 -- valid
  Aperiovula abbotti Cate, 1973 -- valid
  Aphaostracon F. G. Thompson, 1968 -- valid
  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
  Aphelodoris von Ihering, 1886 -- valid
  Aphelodoris antillensis (Bergh, 1879) -- valid
  Aplacophora -- invalid
  Aplexa Fleming, 1820 -- valid
  Aplexa elongata (Say, 1821) -- valid -- Lance Aplexa
  Aplustridae -- valid
  Aplysia Linnaeus, 1758 -- valid
  Aplysia brasiliana Rang, 1828 -- valid -- mottled seahare, sooty seahare
  Aplysia californica J. G. Cooper, 1863 -- valid -- California seahare
  Aplysia cervina (Dall and Simpson, 1901) -- valid
  Aplysia dactylomela Rang, 1828 -- valid -- spotted seahare
  Aplysia donca Ev. Marcus and Er. Marcus, 1960 -- valid
  Aplysia geographica (A. Adams and Reeve, 1850) -- valid
  Aplysia juliana Quoy and Gaimard, 1832 -- valid -- walking seahare
  Aplysia morio (A. E. Verrill, 1901) -- valid -- atlantic black seahare, sooty seahare
  Aplysia parvula Morch, 1863 -- valid -- pygmy seahare
  Aplysia reticulopoda Beeman, 1960 -- valid -- net-foot seahare
  Aplysia vaccaria Winkler, 1955 -- valid -- California black seahare
  Aplysia willcoxi Heilprin, 1886 -- invalid
  Aplysiidae Rafinesque, 1815 -- valid
  Aplysiopsis Deshayes, 1835 -- valid
  Aplysiopsis enteromorphae (Cockerell and Eliot, 1905) -- valid
  Aplysiopsis olivae Mcfarland, 1966 -- valid
  Aplysiopsis zebra K. B. Clark, 1982 -- valid
  Apodopsis Pilsbry and McGinty, 1949 -- invalid
  Apodopsis novimundi Pilsbry and McGinty, 1949 -- invalid
  Apodosis Pilsbry and McGinty, 1949 -- invalid
  Apodosis novimundi Pilsbry and McGinty, 1949 -- invalid
  Aporrhaididae -- valid
  Aporrhais E. M. da Costa, 1778 -- valid
  Aporrhais occidentalis Beck, 1836 -- valid -- American pelicanfoot
  Appalachina Pilsbry, 1940 -- valid
  Appalachina chilhoweensis (J. Lewis, 1870) -- valid -- queen crater
  Appalachina sayana (Pilsbry, 1906) -- valid -- spike-lip crater
  Aquilonaria Dall, 1886 -- valid
  Aquilonaria turneri Dall, 1886 -- valid
  Arca Linnaeus, 1758 -- valid
  Arca imbricata Bruguiere, 1789 -- valid -- mossy ark
  Arca zebra (Swainson, 1833) -- valid -- turkey wing
  Archaeogastropoda Thiele, 1925 -- valid
  Archaeopulmonata -- valid
  Archidorididae -- valid
  Archidoris Bergh, 1868 -- valid
  Archidoris montereyensis (J. G. Cooper, 1863) -- valid -- Monterey sea-lemon
  Archidoris odhneri (MacFarland, 1966) -- valid -- white night doris
  Architaenioglossa -- valid
  Architectonica Roding, 1798 -- valid
  Architectonica nobilis Roding, 1798 -- valid -- common sundial
  Architectonicidae Gray, 1850 -- valid
  Arcidae Lamarck, 1809 -- valid
  Arcidens Simpson, 1900 -- valid
  Arcidens confragosus (Say, 1829) -- valid -- rock pocketbook
  Arcinella Schumacher, 1817 -- valid
  Arcinella arcinella (Linnaeus, 1767) -- valid -- spiny jewelbox
  Arcinella cornuta Conrad, 1866 -- valid -- Florida spiny jewelbox
  Arcoida Stoliczka, 1871 -- valid
  Arcopsis Von Koenen, 1885 -- valid
  Arcopsis adamsi (Dall, 1886) -- valid -- adams ark, cancellate ark
  Arcopsis solida (G. B. Sowerby I, 1833) -- valid -- solid ark
  Arctica Schumacher, 1817 -- valid
  Arctica islandica (Linnaeus, 1767) -- valid -- ocean quahog
  Arcticidae Newton, 1891 -- valid
  Arctinula greenlandica (Sowerby, 1842) -- invalid -- Greenland scallop
  Arctomelon Dall, 1915 -- valid
  Arctomelon stearnsii (Dall, 1872) -- valid -- Alaska volute
  Arene H. Adams and A. Adams, 1854 -- valid
  Arene bairdii (Dall, 1889) -- valid -- warty cyclostreme
  Arene briareus (Dall, 1881) -- valid -- briar cyclostreme
  Arene cruentata (Megerle von Muhlfeld, 1829) -- valid -- star 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
  Argopecten Monterosato, 1889 -- valid
  Argopecten circularis (Sowerby, 1835) -- invalid
  Argopecten gibbus (Linnaeus, 1758) -- valid -- Atlantic calico scallop
  Argopecten irradians (Lamarck, 1819) -- valid -- bay scallop
  Argopecten irradians amplicostatus (Dall, 1898) -- valid
  Argopecten irradians concentricus (Say, 1822) -- valid
  Argopecten irradians irradians (Lamarck, 1819) -- valid -- bay scallop
  Argopecten lineolaris (Lamarck, 1819) -- valid -- lined scallop
  Argopecten nucleus (Born, 1778) -- valid -- nucleus scallop
  Argopecten ventricosus (G. B. Sowerby II, 1842) -- valid -- Pacific calico scallop
  Ariolimax Morch, 1859 -- valid
  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 Ferussac, 1819 -- valid
  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 silvaticus Lohmander, 1937 -- valid -- forest arion
  Arion subfuscus (Draparnaud, 1805) -- valid -- dusky arion
  Arion sylvaticus Lohmander, 1937 -- invalid -- forest arion
  Arionidae -- valid
  Arkansia Ortmann & Walker, 1912 -- invalid
  Arkansia wheeleri Ortmann & Walker, 1912 -- invalid -- Ouachita rock pocketbook, Wheeler's pearly mussel
  Armina Rafinesque, 1814 -- valid
  Armina californica (J. G. Cooper, 1863) -- valid -- California armina
  Armina cordellensis Gosliner and Behrens, 1996 -- valid
  Armina mulleri (von Ihering, 1886) -- valid -- Brazilian armina
  Armina tigrina Rafinesque, 1814 -- valid -- tiger armina
  Armina wattla Ev. Marcus and Er. Marcus, 1967 -- valid
  Arminidae Rafinesque, 1814 -- valid
  Asaphis Modeer, 1793 -- valid
  Asaphis deflorata (Linnaeus, 1758) -- valid -- gaudy sanguin
  Ascobulla Ev. Marcus, 1972 -- valid
  Ascobulla ulla (Er. Marcus and Ev. Marcus, 1970) -- valid -- rice-grain bubblesnail
  Ashmunella Pilsbry and Cockerell, 1899 -- valid
  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 edithae Pilsbry and Cheatum, 1951 -- valid -- McKittrick 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 lenticula Gregg, 1953 -- valid -- Horseshoe Canyon 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 Morch, 1877 -- valid
  Aspella castor Radwin and D'Attilio, 1976 -- valid
  Aspella senex Dall, 1903 -- valid -- graybeard aspella
  Asperiscala de Boury, 1909 -- valid
  Asperiscala bellastriata (Carpenter, 1864) -- valid -- well-threaded wentletrap
  Asperiscala cookeana (Dall, 1917) -- valid
  Asperiscala lowei (Dall, 1906) -- valid
  Assiminea Fleming, 1828 -- valid
  Assiminea californica (Tryon, 1865) -- valid -- California assiminea
  Assiminea infima S. S. Berry, 1947 -- valid -- Badwater Snail
  Assiminea pecos Taylor, 1987 -- valid -- Pecos Assiminea
  Assiminea succinea (Pfeiffer, 1840) -- valid -- Atlantic assiminea
  Assiminea translucens (Carpenter, 1864) -- valid
  Assimineidae H. Adams and A. Adams, 1856 -- valid
  Astarte J. Sowerby, 1816 -- valid
  Astarte alaskensis Dall, 1903 -- invalid
  Astarte arctica (J. E. Gray, 1824) -- valid -- Arctic astarte
  Astarte borealis (Schumacher, 1817) -- valid -- boreal astarte
  Astarte castanea (Say, 1822) -- valid -- smooth astarte
  Astarte compacta Carpenter, 1864 -- valid -- compact astarte
  Astarte crenata (J. E. Gray, 1824) -- valid -- crenulate astarte
  Astarte elliptica (T. Brown, 1827) -- valid -- elliptical astarte
  Astarte esquimalti (Baird, 1863) -- valid -- eskimo astarte, wavy-line astarte
  Astarte montagui (Dillwyn, 1817) -- valid -- narrow-hinge astarte
  Astarte nana Dall, 1886 -- valid -- dwarf astarte
  Astarte rollandi Bernardi, 1859 -- invalid
  Astarte undata Gould, 1841 -- valid -- wavy astarte
  Astarte vernicosa Dall, 1903 -- valid -- varnished astarte
  Astartidae d'Orbigny, 1844 -- valid
  Asteronotidae -- valid
  Asterophila Randall and Heath, 1912 -- valid
  Asterophila japonica Randall and Heath, 1912 -- valid
  Asthenothaerus Carpenter, 1864 -- valid
  Asthenothaerus diegensis (Dall, 1915) -- valid -- San Diego thraciid
  Asthenothaerus hemphilli Dall, 1886 -- valid -- hemphill thracid, square thraciid
  Astraea phoebia Röding, 1798 -- invalid
  Astralium Link, 1807 -- valid
  Astralium phoebium (Röding, 1798) -- valid -- longspine starsnail
  Astyris H. Adams and A. Adams, 1853 -- valid
  Astyris amiantis Dall, 1919 -- valid
  Astyris aurantiaca Dall, 1871 -- valid -- golden dovesnail
  Astyris diaphana A. E. Verrill, 1882 -- valid -- translucent dovesnail
  Astyris gausapata (Gould, 1850) -- valid -- shaggy dovesnail
  Astyris hypodra (Dall, 1916) -- valid
  Astyris lunata (Say, 1826) -- valid -- lunar dovesnail
  Astyris multilineata (Dall, 1889) -- valid -- brown-band dovesnail
  Astyris profundi (Dall, 1889) -- valid -- deepwater dovesnail
  Astyris pura A. E. Verrill, 1882 -- valid -- simple dovesnail
  Astyris raveneli (Dall, 1889) -- valid
  Astyris rosacea (Gould, 1839) -- valid -- rosy northern dovesnail
  Atagema Gray, 1850 -- valid
  Atagema alba (O'Donoghue, 1927) -- valid -- hunchback doris
  Atagema prea (Ev. Marcus and Er. Marcus, 1967) -- valid
  Atlanta Lesueur, 1817 -- valid
  Atlanta brunnea J. E. Gray, 1850 -- valid
  Atlanta californiensis Seapy and Richter, 1993 -- valid
  Atlanta helicinoidea J. E. Gray, 1850 -- valid
  Atlanta helicinoides Souleyet, 1852 -- invalid
  Atlanta inclinata J. E. Gray, 1850 -- valid
  Atlanta inflata J. E. Gray, 1850 -- valid
  Atlanta lesueuri Souleyet, 1852 -- invalid
  Atlanta lesueurii J. E. Gray, 1850 -- valid
  Atlanta peronii Lesueur, 1817 -- valid
  Atlanta turriculata D'Orbigny, 1836 -- valid
  Atlantidae Wiegmann and Ruthe, 1832 -- valid
  Atrina Gray, 1847 -- valid
  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
  Atrina texta Hertlein, Hanna and Strong, 1943 -- valid -- woven penshell
  Attiliosa Emerson, 1968 -- valid
  Attiliosa philippiana (Dall, 1889) -- valid
  Atys Montfort, 1810 -- valid
  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
  Atys riiseanus Morch, 1875 -- valid
  Atys sandersoni Dall, 1881 -- valid
  Austraeolis Burn, 1962 -- valid
  Austraeolis catina Ev. Marcus and Er. Marcus, 1967 -- valid
  Austroneaera Powell, 1937 -- valid
  Austroneaera semipellucida (Kuroda, 1948) -- valid -- North Pacific austroneaera
  Austrotrophon Dall, 1902 -- valid
  Austrotrophon catalinensis (I. S. Oldroyd, 1927) -- valid -- Catalina forreria
  Austrotrophon cerrosensis catalinensis (I. S. Oldroyd, 1927) -- invalid -- Catalina forreria
  Axelella Petit, 1988 -- valid
  Axelella smithii (Dall, 1888) -- valid
  Axinodon A. E. Verrill and Bush, 1898 -- valid
  Axinodon redondoensis (T. A. Burch, 1941) -- valid -- elongate axinopsid
  Axinopsida Keen and Chavan, 1951 -- valid
  Axinopsida cordata (A. E. Verrill and Bush, 1898) -- valid -- heart axinopsid, heart-shaped axinopsid
  Axinopsida orbiculata (G. O. Sars, 1878) -- valid -- orbicular axinopsid
  Axinopsida serricata (Carpenter, 1864) -- valid -- lenticular axinopsid, silky axinopsid
  Axinulus A. E. Verrill and Bush, 1898 -- valid
  Axinulus eumyaria (M. Sars, 1870) -- valid -- mya cleftclam
  Babakina Roller, 1972 -- valid
  Babakina festiva (Roller, 1972) -- valid -- single-stalk aeolis
  Babakinidae -- valid
  Babelomurex Coen, 1922 -- valid
  Babelomurex dalli (Emerson and D'Attilio, 1963) -- valid
  Babelomurex mansfieldi (McGinty, 1940) -- valid
  Babelomurex oldroydi (I. S. Oldroyd, 1929) -- valid
  Bactrocythara Woodring, 1922 -- valid
  Bactrocythara asarca (Dall and Simpson, 1901) -- valid
  Baeolidia Bergh, 1888 -- valid
  Baeolidia benteva Er. Marcus, 1958 -- valid
  Bailya M. Smith, 1944 -- valid
  Bailya intricata (Dall, 1884) -- valid -- intricate phos
  Bailya parva (C. B. Adams, 1850) -- valid
  Bailya weberi (Watters, 1983) -- valid -- banded phos
  Balconorbis Hershler and Longley, 1986 -- valid
  Balconorbis uvaldensis Hershler and Longley, 1986 -- valid -- Balcones Ghostsnail
  Bankia Gray, 1842 -- valid
  Bankia carinata (J. E. Gray, 1827) -- valid -- carinate shipworm
  Bankia fimbriatula Moll and Roch, 1931 -- valid -- fimbriate shipworm
  Bankia gouldi (Bartsch, 1908) -- valid -- cupped shipworm, gould shipworm
  Bankia setacea (Tryon, 1863) -- valid -- feathery shipworm
  Baptodoris Bergh, 1884 -- valid
  Baptodoris mimetica Gosliner, 1991 -- valid
  Barbatia Gray, 1847 -- valid
  Barbatia bailyi (Bartsch, 1931) -- invalid -- baily miniature ark
  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 reeveana (d'Orbigny, 1846) -- valid -- low-rib ark
  Barbatia tenera (C. B. Adams, 1845) -- valid -- delicate ark, doc bales ark
  Barleeia Clark, 1853 -- valid
  Barleeia alderi (Carpenter, 1856) -- valid
  Barleeia bentleyi Bartsch, 1920 -- valid
  Barleeia carpenteri Bartsch, 1920 -- valid
  Barleeia haliotiphila Carpenter, 1864 -- valid -- abalone barleysnail
  Barleeia oldroydi Bartsch, 1920 -- valid
  Barleeia subtenuis Carpenter, 1864 -- valid -- fragile barleysnail
  Barleeia tincta Guppy, 1895 -- valid -- Caribbean barleysnail
  Barleeiidae -- valid
  Barnea Risso, 1826 -- valid
  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
  Bartschia significans Rehder, 1943 -- invalid
  Basommatophora -- valid
  Basterotia Hoernes, 1859 -- valid
  Basterotia corbuloidea Dall, 1899 -- valid -- corbula sportella
  Basterotia elliptica (Recluz, 1850) -- valid -- elliptical sportella
  Basterotia quadrata (Hanley, 1843) -- valid -- square sportella
  Bathyarca Kobelt, 1891 -- valid
  Bathyarca anomala (A. E. Verrill and Bush, 1898) -- valid -- anomalous bathyark
  Bathyarca frielei (Friele, 1877) -- valid -- boreal bathyark, friele 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
  Bathybembix Crosse, 1893 -- valid
  Bathybembix bairdii (Dall, 1889) -- valid
  Bathytoma Harris and Burrows, 1891 -- valid
  Bathytoma viabrunnea (Dall, 1889) -- valid
  Batillaria Benson, 1842 -- valid
  Batillaria attramentaria (G. B. Sowerby II, 1855) -- valid -- Japanese false cerith
  Batillaria minima (Gmelin, 1791) -- valid -- West Indian false cerith
  Batillariidae -- valid
  Bellaspira Conrad, 1868 -- valid
  Bellaspira grippi (Dall, 1908) -- valid
  Bellaspira pentagonalis (Dall, 1889) -- valid -- orange-rib drillia
  Benthomangelia Thiele, 1925 -- valid
  Benthomangelia bandella (Dall, 1881) -- valid
  Benthonella Dall, 1889 -- valid
  Benthonella tenella (Jeffreys, 1869) -- valid
  Benthonellania Dall, 1889 -- valid
  Benthonellania acuticostata (Dall, 1889) -- valid
  Benthonellania colombiana (Romer and Moore, 1988) -- valid
  Benthonellania xanthias (Watson, 1886) -- valid -- sharp-rib alvania
  Beringius Dall, 1886 -- valid
  Beringius behringi (Middendorff, 1848) -- valid
  Beringius beringii (Middendorff, 1848) -- invalid
  Beringius crebricostatus (Dall, 1877) -- valid -- thick-cord whelk
  Beringius eyerdami A. G. Smith, 1959 -- valid
  Beringius frielei Dall, 1895 -- invalid
  Beringius indentatus Dall, 1919 -- valid
  Beringius kennicottii (Dall, 1871) -- valid
  Beringius malleatus (Dall, 1884) -- invalid -- hammered whelk
  Beringius marshalli (Dall, 1919) -- invalid
  Beringius stimpsoni (Gould, 1860) -- valid
  Beringius turtoni (Bean, 1834) -- valid
  Beringius undatus Dall, 1919 -- valid
  Bernardina Dall, 1910 -- valid
  Bernardina bakeri Dall, 1910 -- valid -- baker bernard-clam, Baker bernardclam
  Bernardinidae Keen, 1963 -- invalid
  Berryteuthis magister (Berry, 1913) -- valid -- magister armhook squid
  Berthelinia Gardiner, 1936 -- valid
  Berthelinia caribbea Edmunds, 1963 -- valid -- Caribbean bivalved snail
  Berthella de Blainville, 1825 -- valid
  Berthella agassizii (MacFarland, 1909) -- valid
  Berthella californica (Dall, 1900) -- valid -- California sidegill slug
  Berthella stellata (Risso, 1826) -- valid
  Berthella strongi (MacFarland, 1966) -- valid
  Berthellina Gardiner, 1936 -- valid
  Berthellina engeli (Gardiner, 1936) -- valid
  Binneya J. G. Cooper, 1863 -- valid
  Binneya notabilis J. G. Cooper, 1863 -- valid -- santa barbara shelled slug, Santa Barbara shelledslug
  Biomphalaria Preston, 1910 -- valid
  Biomphalaria glabrata (Say, 1818) -- valid -- bloodfluke planorb
  Biomphalaria havanensis (Pfeiffer, 1839) -- valid -- Ghost Ramshorn
  Birgella F. C. Baker, 1926 -- valid
  Birgella subglobosus (Say, 1825) -- valid -- Globe Siltsnail
  Bithynia Leach, 1818 -- valid
  Bithynia tentaculata (Linnaeus, 1758) -- valid -- mud bithynia
  Bithyniidae -- valid
  Bittiolum Cossmann, 1906 -- valid
  Bittiolum alternatum (Say, 1822) -- valid
  Bittiolum fastigiatum (Carpenter, 1864) -- valid
  Bittiolum varium (Pfeiffer, 1840) -- valid -- grass cerith
  Bittium Gray, 1847 -- valid
  Bittium rugatum (Carpenter, 1864) -- invalid
  Bittium vancouverense Dall and Bartsch, 1910 -- valid
  Bivalvia Linnaeus, 1758 -- valid -- bivalve, bivalves, bivalves, clams, mexilhão, ostra, palourdes
  Blauneria Shuttleworth, 1854 -- valid
  Blauneria heteroclita (Montagu, 1808) -- valid -- left-hand melampus, left-handed melampus
  Boonea Robertson, 1978 -- valid
  Boonea bisuturalis (Say, 1822) -- valid -- two-groove odostome
  Boonea cincta (Carpenter, 1864) -- valid
  Boonea impressa (Say, 1822) -- valid -- impressed odostome
  Boonea seminuda (C. B. Adams, 1839) -- valid -- half-smooth odostome
  Boreacola Bernard, 1979 -- valid
  Boreacola dawsoni (Jeffreys, 1864) -- valid -- hook-hinge montacutid
  Boreocingula Golikov and Kussakin, 1974 -- valid
  Boreocingula castanea (Moller, 1842) -- valid
  Boreocingula globulus (Moller, 1842) -- valid
  Boreocingula martyni (Dall, 1887) -- valid
  Boreotrophon Fischer, 1884 -- valid
  Boreotrophon alaskanus Dall, 1902 -- valid
  Boreotrophon avalonensis Dall, 1902 -- valid -- Avalon trophon
  Boreotrophon bentleyi Dall, 1908 -- valid
  Boreotrophon beringi Dall, 1902 -- invalid -- tabulate trophon
  Boreotrophon clathratus (Linnaeus, 1767) -- valid -- clathrate trophon
  Boreotrophon coronatus (H. Adams and A. Adams, 1864) -- valid -- crown trophon
  Boreotrophon cymatus Dall, 1902 -- invalid -- wavy trophon
  Boreotrophon disparilis (Dall, 1891) -- valid -- girdled trophon
  Boreotrophon eucymatus Dall, 1902 -- valid -- grooved trophon
  Boreotrophon kabati J. H. McLean, 1996 -- valid
  Boreotrophon keepi (Strong and Hertlein, 1937) -- valid
  Boreotrophon multicostatus (Eschscholtz, 1829) -- valid -- ribbed trophon
  Boreotrophon muriciformis (Dall, 1877) -- invalid
  Boreotrophon orpheus (Gould, 1849) -- valid -- threaded trophon
  Boreotrophon pacificus Dall, 1902 -- invalid -- elegant trophon
  Boreotrophon pedroanus (Arnold, 1903) -- valid
  Boreotrophon raymondi (Moody, 1916) -- valid
  Boreotrophon stuarti (E. A. Smith, 1880) -- valid -- winged trophon
  Boreotrophon triangulatus (Carpenter, 1864) -- valid -- triangular trophon
  Boreotrophon tripherus Dall, 1902 -- valid -- rotund trophon
  Boreotrophon truncatus (Strom, 1768) -- valid -- bobtail trophon
  Bornia Philippi, 1836 -- valid
  Bornia longipes (Stimpson, 1855) -- valid -- borniaclam
  Borsonella Dall, 1918 -- valid
  Borsonella bartschi (Arnold, 1903) -- valid
  Borsonella coronadoi (Dall, 1908) -- valid
  Borsonella diegensis (Dall, 1908) -- valid
  Borsonella hooveri (Arnold, 1903) -- valid
  Borsonella merriami (Arnold, 1903) -- valid
  Borsonella omphale Dall, 1919 -- valid
  Borsonella pinosensis Bartsch, 1944 -- valid
  Bosellia Trinchese, 1891 -- valid
  Bosellia corinneae Ev. Marcus, 1973 -- valid
  Bosellia marcusi Ev. Marcus, 1972 -- valid
  Bosellia mimetica Trinchese, 1891 -- valid
  Bothriopupa Pilsbry, 1898 -- valid
  Bothriopupa variolosa (Gould, 1848) -- valid -- pitted birddrop
  Botula Mörch, 1853 -- valid
  Botula fusca (Gmelin, 1791) -- valid -- cinnamon mussel
  Brachidontes Swainson, 1840 -- valid
  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
  Brachycythara Woodring, 1928 -- valid
  Brachycythara barbarae Lyons, 1972 -- valid
  Brachycythara biconica (C. B. Adams, 1850) -- valid
  Bractechlamys Iredale, 1939 -- valid
  Bractechlamys antillarum (Recluz, 1853) -- valid -- Antillean scallop
  Bradybaena Beck, 1837 -- valid
  Bradybaena similaris (Ferussac, 1821) -- valid -- Asian trampsnail
  Bradybaenidae -- valid
  Buccinidae Rafinesque, 1815 -- valid
  Buccinum aleuticum Dall, 1895 -- valid -- Aleut whelk
  Buccinum amaliae Verkruzen, 1878 -- valid
  Buccinum angulosum J. E. Gray, 1839 -- valid -- angular whelk
  Buccinum baerii (Middendorff, 1848) -- valid
  Buccinum bulimuloideum Dall, 1907 -- valid
  Buccinum castaneum Dall, 1877 -- invalid
  Buccinum castaneum castaneum Dall, 1877 -- invalid -- chestnut whelk
  Buccinum castaneum fluctuatum Dall, 1919 -- invalid
  Buccinum castaneum triplostephanum Dall, 1919 -- invalid
  Buccinum chishimanum Pilsbry, 1904 -- valid
  Buccinum ciliatum Fabricius, 1780 -- valid
  Buccinum cnismatopleura Dall, 1919 -- invalid
  Buccinum cyaneum Bruguiere, 1792 -- valid -- bluish whelk
  Buccinum cyaneum cyaneum Bruguiere, 1792 -- valid -- bluish whelk
  Buccinum cyaneum patulum G. O. Sars, 1878 -- valid -- bluish whelk
  Buccinum cyaneum perdix Morch, 1868 -- valid -- bluish whelk
  Buccinum eugrammatum Dall, 1907 -- valid -- lirate whelk
  Buccinum fischerianum Dall, 1871 -- invalid
  Buccinum fringillum Dall, 1877 -- valid -- finch whelk
  Buccinum glaciale Linnaeus, 1761 -- valid -- glacial whelk
  Buccinum gouldii A. E. Verrill, 1882 -- valid
  Buccinum hertzensteini Verkruzen, 1882 -- valid
  Buccinum hydrophanum Hancock, 1846 -- valid
  Buccinum inexhaustum Verkruzen, 1878 -- valid
  Buccinum kadiakense Dall, 1907 -- valid -- kodiak whelk
  Buccinum micropoma Thorson, 1944 -- valid -- berry whelk
  Buccinum moerchi Friele, 1877 -- valid
  Buccinum nivale Friele, 1882 -- valid
  Buccinum ochotense (Middendorff, 1848) -- valid -- Okhotsk whelk
  Buccinum onismatopleura Dall, 1919 -- invalid
  Buccinum pemphigus Dall, 1907 -- valid
  Buccinum percrassum Dall, 1883 -- valid -- crude whelk
  Buccinum physematum Dall, 1919 -- valid
  Buccinum picturatum Dall, 1877 -- valid -- painted whelk
  Buccinum planeticum Dall, 1919 -- valid -- wandering whelk
  Buccinum plectrum Stimpson, 1865 -- valid -- sinuous whelk
  Buccinum polare J. E. Gray, 1839 -- invalid
  Buccinum polaris J. E. Gray, 1839 -- valid -- polar whelk
  Buccinum scalariforme Moller, 1842 -- valid -- ladder whelk
  Buccinum sericatum Hancock, 1846 -- valid -- silky whelk
  Buccinum sigmatopleura Dall, 1907 -- valid
  Buccinum simulatum Dall, 1907 -- valid
  Buccinum solenum Dall, 1919 -- valid
  Buccinum striatissimum G. B. Sowerby III, 1899 -- valid
  Buccinum strigillatum Dall, 1891 -- valid
  Buccinum strigillatum fucanum Dall, 1907 -- valid -- juanmore whelk
  Buccinum tenellum Dall, 1883 -- valid
  Buccinum totteni Stimpson, 1865 -- valid -- thin whelk
  Buccinum undatum Linnaeus, 1758 -- valid -- waved whelk
  Bufonaria Schumacher, 1817 -- valid
  Bufonaria bufo (Bruguiere, 1792) -- valid -- chestnut frogsnail
  Bulbus Brown, 1839 -- valid
  Bulbus fragilis (Leach, 1819) -- valid -- fragile moonsnail
  Bulimnaea Haldeman, 1841 -- valid
  Bulimnaea megasoma (Say, 1824) -- valid -- mammoth lymnaea
  Bulimulidae -- valid
  Bulimulus Leach, 1814 -- valid
  Bulimulus guadalupensis (Bruguiere, 1789) -- valid -- West Indian bulimulus
  Bulla Linnaeus, 1758 -- valid
  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
  Bullidae Rafinesque, 1815 -- valid
  Bullina Ferussac, 1822 -- valid
  Bullina exquisita McGinty, 1955 -- valid -- exquisite bubble
  Bullinidae -- valid
  Bursa Roding, 1798 -- valid
  Bursa corrugata Perry, 1811 -- valid -- gaudy frogsnail
  Bursa corrugata ponderosa (Reeve, 1844) -- valid -- gaudy frogsnail
  Bursa granularis Roding, 1798 -- valid -- Cuba frogsnail
  Bursa granularis cubaniana (d'Orbigny, 1842) -- valid -- Cuba frogsnail
  Bursa grayana Dunker, 1862 -- valid -- elegant frogsnail
  Bursa ranelloides (Reeve, 1844) -- valid -- fine-sculpted frogsnail
  Bursa ranelloides tenuisculpta (Dautzenberg and H. Fischer, 1906) -- valid -- fine-sculpted frogsnail
  Bursa rhodostoma (G. B. Sowerby I or II, 1835) -- valid -- St. Thomas frogsnail
  Bursa rhodostoma thomae (d'Orbigny, 1842) -- valid -- St. Thomas frogsnail
  Bursatella de Blainville, 1817 -- valid
  Bursatella leachii de Blainville, 1817 -- valid -- ragged seahare
  Bursatella leachii pleii Rang, 1828 -- valid -- ragged seahare
  Bursidae Thiele, 1925 -- valid
  Bushia Dall, 1886 -- valid
  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 lyonsi Petuch, 1987 -- valid
  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 Bergh, 1879 -- valid
  Cadlina flavomaculata MacFarland, 1905 -- valid -- yellow-spot cadlina
  Cadlina laevis (Linnaeus, 1767) -- valid -- white Atlantic cadlina
  Cadlina limbaughorum Lance, 1962 -- valid
  Cadlina luteomarginata MacFarland, 1966 -- valid -- yellow-edge cadlina
  Cadlina modesta MacFarland, 1966 -- valid -- modest cadlina
  Cadlina pacifica Bergh, 1879 -- valid
  Cadlina rumia Er. Marcus, 1955 -- valid
  Cadlina scabriuscula (Bergh, 1890) -- valid
  Cadlina sparsa (Odhner, 1921) -- valid -- dark-spot cadlina
  Caducifer weberi Watters, 1983 -- invalid -- banded phos
  Cadulus aberrans Whiteaves, 1887 -- valid -- aberrant toothshell
  Cadulus transitorius (J. B. Henderson, 1920) -- valid -- inflated toothshell
  Caecidae Gray, 1815 -- valid
  Caecum Fleming, 1813 -- valid
  Caecum antillarum Carpenter, 1858 -- valid -- Antillean caecum
  Caecum bipartitum de Folin, 1870 -- valid
  Caecum breve de Folin, 1867 -- valid
  Caecum californicum Dall, 1885 -- valid -- California caecum
  Caecum carolinianum Dall, 1892 -- valid -- Carolina caecum
  Caecum carpenteri (Bartsch, 1920) -- valid
  Caecum clava de Folin, 1867 -- valid -- club caecum
  Caecum condylum Moore, 1969 -- valid -- bone caecum
  Caecum cooperi S. Smith, 1860 -- valid
  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 dalli Bartsch, 1920 -- valid
  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 insularum Moore, 1969 -- valid
  Caecum johnsoni Winkley, 1908 -- valid
  Caecum nitidum Stimpson, 1851 -- valid -- little horn caecum
  Caecum occidentale (Bartsch, 1920) -- valid -- western caecum
  Caecum orcutti (Dall, 1885) -- valid
  Caecum plicatum Carpenter, 1858 -- valid -- plicate caecum
  Caecum pulchellum Stimpson, 1851 -- valid -- beautiful caecum
  Caecum regulare Carpenter, 1858 -- valid
  Caecum ryssotitum de Folin, 1867 -- valid -- minute caecum
  Caecum strigosum de Folin, 1868 -- valid
  Caecum subvolutum de Folin, 1874 -- valid
  Caecum textile de Folin, 1867 -- valid -- textile caecum
  Caecum tortile Dall, 1892 -- valid -- twisted caecum
  Caecum vestitum de Folin, 1868 -- valid -- Vera Cruz caecum
  Caelatura Conrad, 1853 -- valid
  Caelatura rustica (Watson, 1886) -- valid
  Cahuillus Roth, 1996 -- valid
  Cahuillus greggi (W. B. Miller, 1981) -- valid -- Panamint desertsnail
  Cahuillus indioensis (Yates, 1890) -- valid -- Coachella desertsnail
  Calinaticina J. Q. Burch and Campbell, 1963 -- valid
  Caliphylla A. Costa, 1869 -- valid
  Caliphylla mediterranea (A. Costa, 1867) -- valid
  Caliphyllidae -- valid
  Calliodentaliidae Chistikov, 1975 -- valid
  Calliodentalium callipeplum (Dall, 1889) -- valid -- gorgeous tuskshell
  Calliostoma Swainson, 1840 -- valid
  Calliostoma adelae Schwengel, 1951 -- valid -- Keys topsnail
  Calliostoma annulatum (Lightfoot, 1786) -- valid -- purple-ring topsnail
  Calliostoma bairdii A. E. Verrill and S. Smith, 1880 -- valid
  Calliostoma bairdii bairdii A. E. Verrill and S. Smith, 1880 -- valid
  Calliostoma bairdii hendersoni Dall, 1927 -- valid
  Calliostoma bairdii oregon Clench and Turner, 1960 -- valid
  Calliostoma bairdii psyche Dall, 1927 -- valid
  Calliostoma bairdii rosewateri Clench and Turner, 1960 -- valid
  Calliostoma barbouri Clench and Aguayo, 1946 -- valid
  Calliostoma bernardi J. H. McLean, 1984 -- valid
  Calliostoma canaliculatum (Lightfoot, 1786) -- valid -- channeled topsnail
  Calliostoma dentatum Quinn, 1992 -- valid -- sprocket 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 hendersoni Dall, 1927 -- valid
  Calliostoma javanicum (Lamarck, 1822) -- valid -- chocolate-line topsnail
  Calliostoma jujubinum (Gmelin, 1791) -- valid -- mottled topsnail
  Calliostoma keenae J. H. McLean, 1970 -- valid
  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 sapidum Dall, 1881 -- valid -- ratchet topsnail
  Calliostoma sayanum Dall, 1889 -- valid
  Calliostoma scalenum Quinn, 1992 -- valid -- Gulf Stream topsnail
  Calliostoma splendens Carpenter, 1864 -- valid -- splendid topsnail
  Calliostoma supragranosum Carpenter, 1864 -- valid -- granulose topsnail
  Calliostoma tampaense (Conrad, 1846) -- valid -- Tampa Bay 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
  Calliostomatidae -- valid
  Calliotropis Seguenza, 1903 -- valid
  Calliotropis regalis (A. E. Verrill and S. Smith, 1880) -- valid -- regal spiny margarite
  Callista Poli, 1791 -- valid
  Callista eucymata (Dall, 1890) -- valid -- glory-of-the-seas venus
  Callistochiton Dall, 1879 -- valid
  Callistochiton asthenes (S. S. Berry, 1919) -- valid
  Callistochiton decoratus Keep, 1887 -- valid
  Callistochiton palmulatus Dall, 1879 -- valid
  Callistochiton portobelensis Ferreira, 1976 -- valid -- Portobelo chiton
  Callistochiton shuttleworthianus Pilsbry, 1893 -- valid -- eastern orange chiton
  Callistoplacidae Pilsbry, 1893 -- invalid
  Calotrophon Hertlien and Strong, 1951 -- valid
  Calotrophon andrewsi Vokes, 1976 -- valid
  Calotrophon ostrearum (Conrad, 1846) -- valid -- mauve-mouth drill
  Calycidoris Abraham, 1876 -- valid
  Calycidoris guentheri Abraham, 1876 -- valid
  Calyptoconcha Bouchet and Waren, 1993 -- valid
  Calyptoconcha pellucida (A. E. Verrill, 1880) -- valid -- transluscent lamellaria
  Calyptraea Lamarck, 1799 -- valid
  Calyptraea burchi A. G. Smith and M. Gordon, 1948 -- valid
  Calyptraea centralis (Conrad, 1841) -- valid -- circular chinese hat, circular Chinese-hat
  Calyptraea fastigiata Gould, 1846 -- valid -- pacific chinese hat, Pacific Chinese-hat
  Calyptraeidae Blainville, 1824 -- valid
  Camaenidae -- valid
  Campeloma Rafinesque, 1819 -- valid
  Campeloma brevispirum F. C. Baker, 1928 -- valid
  Campeloma crassulum Rafinesque, 1819 -- valid -- Ponderous Campeloma
  Campeloma decampi (W. G. Binney, 1865) -- valid -- Slender Campeloma
  Campeloma decisum (Say, 1817) -- valid -- Pointed Campeloma
  Campeloma exile (Anthony, 1860) -- invalid
  Campeloma floridense Call, 1886 -- valid -- Purple-throat Campeloma, Purple-throated Campeloma
  Campeloma geniculum (Conrad, 1834) -- valid -- Ovate Campeloma
  Campeloma gibbum (Currier, 1867) -- invalid
  Campeloma leptum Mattox, 1940 -- invalid
  Campeloma lewisi Walker, 1915 -- invalid
  Campeloma limum (Anthony, 1860) -- valid -- File Campeloma
  Campeloma milesi (Lea, 1863) -- valid
  Campeloma parthenum Vail, 1979 -- valid -- Maiden Campeloma
  Campeloma regulare (Lea, 1841) -- valid -- Cylinder Campeloma
  Campeloma rufum (Haldeman, 1841) -- valid
  Campeloma tannum Mattox, 1940 -- invalid
  Cancellaria Lamarck, 1799 -- valid
  Cancellaria adelae Pilsbry, 1940 -- valid
  Cancellaria cooperii Gabb, 1865 -- valid
  Cancellaria corbicula Dall, 1908 -- invalid -- basket nutmeg
  Cancellaria crawfordiana Dall, 1891 -- valid
  Cancellaria middendorffiana (Dall, 1884) -- invalid
  Cancellaria reticulata (Linnaeus, 1767) -- valid
  Cancellaria reticulata adelae Pilsbry, 1940 -- invalid
  Cancellaria richardpetiti Petuch, 1987 -- valid
  Cancellariidae Forbes and Hanley, 1853 -- valid
  Candidula Kobelt, 1871 -- valid
  Candidula intersecta (Poiret, 1801) -- valid -- wrinkled helicellid
  Cantharus Roding, 1798 -- valid
  Cantharus cancellarius (Conrad, 1846) -- valid -- cancellate cantharus
  Cantharus multangulus (Philippi, 1848) -- valid -- ribbed cantharus
  Capulidae Fleming, 1822 -- valid
  Capulus Montfort, 1810 -- valid
  Capulus californicus Dall, 1900 -- valid -- California capsnail
  Capulus incurvus (Gmelin, 1791) -- valid -- incurved capsnail
  Caracolus Montfort, 1810 -- valid
  Caracolus marginella (Gmelin, 1791) -- valid -- banded caracol
  Cardiapoda D'Orbigny, 1835 -- valid
  Cardiapoda placenta (Lesson, 1830) -- valid -- flat cardiapod
  Cardiidae Lamarck, 1809 -- valid
  Cardiomya A. Adams, 1864 -- valid
  Cardiomya balboae (Dall, 1916) -- valid -- Balboa cardiomya
  Cardiomya behringensis (Leche, 1883) -- valid -- Bering cardiomya
  Cardiomya costellata (Deshayes, 1830) -- valid -- little-ribbed cardiomya
  Cardiomya gemma A. E. Verrill and Bush, 1898 -- valid -- precious cardiomya
  Cardiomya glypta (Bush, 1885) -- valid -- carved 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 -- fine-rib cardiomya, planet cardiomya
  Cardiomya striata (Jeffreys, 1876) -- valid -- striate cardiomya
  Carditamera Conrad, 1838 -- valid
  Carditamera floridana Conrad, 1838 -- valid -- broad-ribbed carditid
  Carditidae Fleming, 1828 -- valid
  Carditopsis E. A. Smith, 1881 -- valid
  Carditopsis smithii (Dall, 1896) -- valid -- tiny condylclam
  Careliopsis Morch, 1875 -- valid
  Careliopsis styliformis (Morch, 1875) -- valid
  Caribachlamys Waller, 1993 -- valid
  Caribachlamys imbricata (Gmelin, 1791) -- valid -- knobby scallop
  Caribachlamys mildredae (Bayer, 1941) -- valid -- alternate-ribbed scallop
  Caribachlamys ornata (Lamarck, 1819) -- valid -- ornate scallop
  Caribachlamys sentis (Reeve, 1853) -- valid -- scaly scallop
  Carinaria Lamarck, 1801 -- valid
  Carinaria cithara Benson, 1835 -- valid -- harp carinaria
  Carinaria cristata (Linnaeus, 1767) -- valid
  Carinaria galea Benson, 1835 -- valid -- helmet carinaria
  Carinaria lamarcki Peron and Lesueur, 1810 -- valid
  Carinoturris Bartsch, 1944 -- valid
  Carinoturris fortis Bartsch, 1944 -- valid
  Carychiidae Jeffreys, 1830 -- invalid
  Carychium O. F. Muller, 1773 -- valid
  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 -- herald thorn, tiny herald snail
  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
  Carychium tridentatum (Risso, 1826) -- valid -- dentate thorn
  Caryocorbula Bruguiere, 1792 -- valid
  Caryocorbula porcella (Dall, 1916) -- valid -- ribbed corbula
  Casmaria H. Adams and A. Adams, 1853 -- valid
  Casmaria ponderosa (Gmelin, 1791) -- valid -- Atlantic casmaria
  Casmaria ponderosa atlantica Clench, 1944 -- valid -- Atlantic casmaria
  Cassidae Latreille, 1825 -- valid
  Cassis Scopoli, 1777 -- valid
  Cassis flammea (Linnaeus, 1758) -- valid -- flame helmet
  Cassis madagascariensis Lamarck, 1822 -- valid -- cameo helmet
  Cassis tuberosa (Linnaeus, 1758) -- valid -- Caribbean helmet
  Catinella Pease, 1870 -- valid
  Catinella aprica Hubricht, 1968 -- valid -- diurnal ambersnail
  Catinella gabbii (Tryon, 1866) -- valid -- riblet ambersnail
  Catinella hubrichti Grimm, 1960 -- valid -- Snowhill ambersnail
  Catinella oklahomarum (Webb, 1953) -- valid -- detritis ambersnail, detritus ambersnail
  Catinella parallela Franzen, 1979 -- valid
  Catinella pinicola Grimm, 1960 -- valid -- pinewoods ambersnail
  Catinella protracta Franzen, 1983 -- valid
  Catinella pugilator Hubricht, 1961 -- valid -- weedpatch ambersnail
  Catinella rehderi (Pilsbry, 1948) -- valid -- chrome ambersnail
  Catinella stretchiana (Bland, 1865) -- valid -- Sierra ambersnail
  Catinella texana Hubricht, 1961 -- valid
  Catinella vagans (Pilsbry, 1900) -- valid -- mudbank ambersnail
  Catinella vermeta (Say, 1829) -- valid -- suboval ambersnail
  Catinella waccamawensis Franzen, 1981 -- valid
  Catinella wandae (Webb, 1953) -- valid -- slope ambersnail
  Catriona Winckworth, 1941 -- valid
  Catriona columbiana (O'Donoghue, 1922) -- valid -- red-tentacle cuthona
  Catriona gymnota (Couthouy, 1838) -- valid -- orange-tip cuthona
  Catriona maua Ev. Marcus and Er. Marcus, 1960 -- valid
  Catriona oba Ev. Marcus, 1970 -- valid
  Catriona rickettsi Behrens, 1984 -- valid
  Cavolinia Abildgaard, 1791 -- valid
  Cavolinia gibbosa (d'Orbigny, 1836) -- valid -- gibbose cavoline
  Cavolinia inflexa (Lesueur, 1813) -- valid -- inflexed cavoline
  Cavolinia tridentata (Niebuhr, 1775) -- valid -- three-tooth cavoline
  Cavolinia uncinata (Rang, 1829) -- valid -- uncinate cavoline
  Cavoliniidae H. and A. Adams, 1854 -- valid
  Cecilioides Ferussac, 1814 -- valid
  Cecilioides acicula (Muller, 1774) -- valid -- blind awlsnail
  Cecilioides aperta (Swainson, 1840) -- valid -- obtuse awlsnail
  Cecina A. Adams, 1861 -- valid
  Cecina manchurica A. Adams, 1861 -- valid
  Cenchritis von Martens, 1900 -- valid
  Cenchritis muricatus (Linnaeus, 1758) -- valid -- beaded periwinkle
  Cepaea Held, 1837 -- valid
  Cepaea hortensis (Muller, 1774) -- valid -- white-lip gardensnail
  Cepaea nemoralis (Linnaeus, 1758) -- valid -- grovesnail
  Cephalaspidea P. Fischer, 1883 -- valid
  Cerastoderma Poli, 1795 -- valid
  Cerastoderma elegantulum Beck, 1842 -- valid -- elegant dwarf cockle
  Cerastoderma pinnulatum (Conrad, 1831) -- valid -- northern dwarf cockle
  Ceratophyllidia Elliot, 1903 -- valid
  Ceratophyllidia papilligera (Bergh, 1890) -- valid
  Ceratostoma Herrmannsen, 1846 -- valid
  Ceratostoma foliatum (Gmelin, 1791) -- valid -- foliate thornmouth
  Ceratostoma nuttalli (Conrad, 1837) -- valid
  Ceratozona Dall, 1882 -- valid
  Ceratozona squalida (C. B. Adams, 1845) -- valid -- eastern surf chiton
  Cerberilla Bergh, 1873 -- valid
  Cerberilla mosslandica McDonald and Nybakken, 1975 -- valid -- brown burrowing aeolis
  Cerberilla tanna Ev. Marcus and Er. Marcus, 1960 -- valid
  Ceriidae -- valid
  Cerion Roding, 1798 -- valid
  Cerion casablancae Bartsch, 1920 -- valid
  Cerion chrysalis (Ferussac in Beck, 1837) -- valid
  Cerion chrysalis fastigatum Maynard, 1896 -- valid
  Cerion incanum (A. Binney, 1851) -- valid -- gray cerion, gray peanut-snail
  Cerion sculptum (Poey, 1858) -- valid
  Cerion sculptum marielinum Torre, 1927 -- valid
  Cerion tridentatum Pilsbry and Vanatta, 1895 -- valid
  Cerion viaregis Bartsch, 1920 -- valid
  Cerithidea Swainson, 1840 -- valid
  Cerithidea californica (Haldeman, 1840) -- valid -- California hornsnail
  Cerithidea costata (E. M. da Costa, 1778) -- valid -- costate hornsnail
  Cerithidea fuscata Gould, 1857 -- valid
  Cerithidea pliculosa (Menke, 1829) -- valid -- plicate hornsnail
  Cerithidea scalariformis (Say, 1825) -- valid -- ladder hornsnail
  Cerithiidae Fleming, 1822 -- valid
  Cerithiopsida Bartsch, 1911 -- valid
  Cerithiopsida diegensis (Bartsch, 1911) -- valid
  Cerithiopsida rowelli (Bartsch, 1911) -- valid
  Cerithiopsidae H. and A. Adams, 1854 -- valid
  Cerithiopsidella Bartsch, 1911 -- valid
  Cerithiopsidella alcima (Bartsch, 1911) -- valid
  Cerithiopsidella antefilosa (Bartsch, 1911) -- valid
  Cerithiopsidella cosmia (Bartsch, 1907) -- valid
  Cerithiopsina Bartsch, 1911 -- valid
  Cerithiopsina signa (Bartsch, 1921) -- valid
  Cerithiopsis Forbes and Hanley, 1851 -- valid
  Cerithiopsis albovittata (C. B. Adams, 1850) -- valid
  Cerithiopsis antemunda Bartsch, 1911 -- valid
  Cerithiopsis arnoldi Bartsch, 1911 -- valid
  Cerithiopsis berryi Bartsch, 1911 -- valid
  Cerithiopsis carpenteri Bartsch, 1911 -- valid
  Cerithiopsis cesta Bartsch, 1911 -- valid
  Cerithiopsis charlottensis Bartsch, 1917 -- valid
  Cerithiopsis columna Carpenter, 1864 -- valid
  Cerithiopsis diomedeae Bartsch, 1911 -- valid
  Cerithiopsis emersonii (C. B. Adams, 1839) -- valid
  Cerithiopsis flava (C. B. Adams, 1850) -- valid
  Cerithiopsis fusiformis (C. B. Adams, 1850) -- valid
  Cerithiopsis gloriosa Bartsch, 1911 -- valid
  Cerithiopsis greenii (C. B. Adams, 1839) -- valid
  Cerithiopsis grippi Bartsch, 1917 -- valid
  Cerithiopsis ingens (Bartsch, 1907) -- valid
  Cerithiopsis io Dall and Bartsch, 1911 -- valid
  Cerithiopsis iota (C. B. Adams, 1845) -- valid
  Cerithiopsis jeffreysi Watson, 1885 -- valid
  Cerithiopsis lata (C. B. Adams, 1850) -- valid
  Cerithiopsis montereyensis Bartsch, 1911 -- valid
  Cerithiopsis onealensis Bartsch, 1921 -- valid
  Cerithiopsis paramoea Bartsch, 1911 -- valid
  Cerithiopsis pedroana Bartsch, 1907 -- valid
  Cerithiopsis stejnegeri Dall, 1884 -- valid
  Cerithiopsis stephensae Bartsch, 1909 -- valid
  Cerithiopsis tubercularis Montagu, 1803 -- valid
  Cerithiopsis tubercularis floridana Dall, 1892 -- valid
  Cerithiopsis tumida (Bartsch, 1907) -- valid
  Cerithiopsis vanhyningi Bartsch, 1918 -- valid
  Cerithiopsis virginica J. B. Henderson and Bartsch, 1914 -- valid
  Cerithiopsis willetti Bartsch, 1921 -- invalid
  Cerithium Bruguiere, 1789 -- valid
  Cerithium atratum (Born, 1778) -- valid -- dark cerith
  Cerithium eburneum Bruguiere, 1792 -- valid -- ivory cerith
  Cerithium guinaicum Philippi, 1849 -- valid -- Guinea cerith
  Cerithium lindae Petuch, 1987 -- valid
  Cerithium litteratum (Born, 1778) -- valid -- stocky cerith
  Cerithium lutosum Menke, 1828 -- valid -- variable cerith
  Cerithium muscarum Say, 1822 -- valid -- flyspeck cerith
  Cernuella Schluter, 1838 -- valid
  Cernuella virgata (Muller, 1774) -- valid -- maritime gardensnail
  Cerodrillia Bartsch and Rehder, 1939 -- valid
  Cerodrillia bealiana Schwengel and McGinty, 1942 -- valid
  Cerodrillia clappi Bartsch and Rehder, 1939 -- valid
  Cerodrillia girardi Lyons, 1972 -- valid
  Cerodrillia perryae Bartsch and Rehder, 1939 -- valid
  Cerodrillia schroederi Bartsch and Rehder, 1939 -- invalid
  Cerodrillia simpsoni Dall, 1887 -- invalid
  Cerodrillia thea (Dall, 1884) -- valid -- tea drillia
  Cerodrillia verrillii (Dall, 1881) -- valid
  Chaceia Turner, 1855 -- valid
  Chaceia ovoidea (Gould, 1851) -- valid -- wartneck piddock
  Chaenaxis Pilsbry and Ferriss, 1906 -- valid
  Chaenaxis tuba (Pilsbry and Ferriss, 1906) -- valid -- hollow tuba
  Chaetoderma Loven, 1844 -- valid
  Chaetoderma argenteum Heath, 1911 -- valid -- glistenworm
  Chaetoderma canadense Nierstrasz, 1902 -- valid -- glistenworm
  Chaetoderma elegans Scheltema, 1997 -- valid -- glistenworm
  Chaetoderma hancocki (Schwabl, 1963) -- valid -- glistenworm
  Chaetoderma marinelli (Schwabl, 1963) -- valid -- glistenworm
  Chaetoderma nanulum Heath, 1911 -- valid -- glistenworm
  Chaetoderma nitidulum Loven, 1844 -- valid -- glistenworm
  Chaetoderma productum Wiren, 1892 -- valid -- glistenworm
  Chaetoderma scabrum Heath, 1911 -- valid -- glistenworm
  Chaetodermatidae Ihering, 1876 -- valid
  Chaetodermomorpha -- invalid
  Chaetopleura Shuttleworth, 1853 -- valid
  Chaetopleura apiculata (Say, 1834) -- valid -- eastern beaded chiton
  Chaetopleura gemma Dall, 1879 -- valid
  Chaetopleura janeirensis (J. E. Gray, 1828) -- valid -- West Indian ribbed chiton
  Chaetopleura lanuginosa (Dall, 1879) -- valid
  Chaetopleura staphylophera Lyons, 1985 -- valid
  Chaetopleuridae Plate, 1899 -- invalid
  Chama Linnaeus, 1758 -- valid
  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
  Chamaearionta Berry, 1930 -- valid
  Chamaearionta aquaealbae (S. S. Berry, 1922) -- valid -- Whitewater desertsnail
  Chamidae Lamarck, 1809 -- valid
  Charonia Gistel, 1848 -- valid
  Charonia tritonis (Linnaeus, 1758) -- valid -- Atlantic trumpet triton
  Charonia tritonis variegata (Lamarck, 1816) -- valid -- Atlantic trumpet triton
  Charopidae -- valid
  Cheilea Modeer, 1793 -- valid
  Cheilea equestris (Linnaeus, 1758) -- valid -- false cup-and-saucer
  Chelidonura A. Adams, 1850 -- valid
  Chelidonura hirundinina (Quoy and Gaimard, 1833) -- valid -- leech aglaja, swallowtail aglaja
  Chelidonura sabina Er. Marcus and Ev. Marcus, 1970 -- valid -- Sabine Island aglaja
  Chicoreus Montfort, 1810 -- valid
  Chicoreus beauii (P. Fischer and Bernardi, 1857) -- valid
  Chicoreus cailleti (Petit de la Saussaye, 1856) -- valid
  Chicoreus consuela (A. H. Verrill, 1950) -- valid
  Chicoreus dilectus (A. Adams, 1855) -- valid -- lace murex
  Chicoreus florifer dilectus (A. Adams, 1855) -- invalid -- lace murex
  Chicoreus formosus (Sowerby, 1841) -- valid
  Chicoreus mergus Vokes, 1974 -- valid
  Chicoreus oculatus (Reeve, 1845) -- valid
  Chicoreus pomum (Gmelin, 1791) -- valid -- apple murex
  Chione Megerle von Mühlfeld, 1811 -- valid
  Chione californiensis (Broderip, 1835) -- valid -- California venus
  Chione cancellata (Linnaeus, 1767) -- valid -- cross-barred venus
  Chione clenchi Pulley, 1952 -- invalid -- Clench venus
  Chione fluctifraga (G. B. Sowerby II, 1853) -- invalid -- smooth venus
  Chione grus (Holmes, 1858) -- invalid -- gray pygmy venus
  Chione intapurpurea (Conrad, 1849) -- invalid -- lady-in-waiting venus
  Chione latilirata (Conrad, 1841) -- invalid -- imperial 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
  Chionista Keen, 1958 -- valid
  Chionista fluctifraga (G. B. Sowerby II, 1853) -- valid -- smooth venus
  Chiton Linnaeus, 1758 -- valid
  Chiton tuberculatus Linnaeus, 1758 -- valid -- West Indian green chiton
  Chiton viridis Spengler, 1797 -- valid
  Chitonidae Rafinesque, 1815 -- valid
  Chlamydoconcha Dall, 1884 -- valid
  Chlamydoconcha orcutti Dall, 1884 -- valid -- Orcutt nakedclam
  Chlamys Röding, 1798 -- valid
  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 imbricata (Gmelin, 1791) -- invalid -- knobby scallop
  Chlamys islandica (Müller, 1776) -- valid -- Iceland scallop
  Chlamys mildredae (Bayer, 1941) -- invalid -- Mildred scallop
  Chlamys multisquamata (Dunker, 1864) -- invalid -- many-ribbed scallop
  Chlamys ornata (Lamarck, 1819) -- invalid -- ornate scallop
  Chlamys rubida (Hinds, 1845) -- valid -- reddish scallop
  Chlamys sentis (Reeve, 1853) -- invalid -- scaly scallop
  Chondropoma Pfeiffer, 1847 -- valid
  Chondropoma dentatum (Say, 1825) -- valid -- crenulate horn
  Choristodon Jonas, 1844 -- valid
  Choristodon robustum (G. B. Sowerby I, 1834) -- valid -- Atlantic petricolid
  Chromodorididae -- valid
  Chromodoris Alder and Hancock, 1855 -- valid
  Chromodoris aila Er. Marcus, 1961 -- valid
  Chromodoris binza Ev. Marcus and Er. Marcus, 1963 -- valid
  Chromodoris clenchi (Russell, 1935) -- valid -- harlequin blue doris
  Chromodoris kempfi Ev. Marcus, 1970 -- valid
  Chromodoris macfarlandi Cockerell, 1901 -- valid -- three-stripe doris
  Chromodoris morchii Bergh, 1879 -- valid
  Chromodoris nyalya Ev. Marcus and Er. Marcus, 1967 -- valid -- red-line blue doris
  Chromodoris punctilucens Bergh, 1890 -- valid
  Chrysallida Carpenter, 1857 -- valid
  Chrysallida cancellata (d'Orbigny, 1842) -- valid
  Chrysallida gemmulosa (C. B. Adams, 1850) -- valid
  Chrysallida toroensis (Olsson and McGinty, 1958) -- valid
  Cidarina Dall, 1909 -- valid
  Cidarina cidaris (A. Adams, 1864) -- valid
  Cincinnatia Pilsbry, 1891 -- valid
  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
  Cincinnatia winkleyi (Pilsbry, 1912) -- invalid
  Cingula Fleming, 1828 -- valid
  Cingula montereyensis Bartsch, 1912 -- valid
  Cingula robusta scipio Dall, 1887 -- invalid
  Cingula scipio Dall, 1887 -- valid
  Cionella Jeffreys, 1829 -- valid
  Cionella lubrica (Muller, 1774) -- valid -- glossy pillar
  Cionella lubricella (Porro, 1838) -- valid -- thin pillar
  Cionella morseana Doherty, 1878 -- valid -- Appalachian pillar
  Cionella nitens (Gallenstein, 1848) -- valid -- robust pillar
  Cionellidae -- valid
  Cipangopaludina Hannibal, 1912 -- valid
  Cipangopaludina chinensis (Gray, 1834) -- valid -- Chinese mysterysnail
  Cipangopaludina chinensis malleata (Reeve, 1863) -- valid -- Chinese mysterysnail
  Cipangopaludina japonica (von Martens, 1861) -- valid -- Japanese mysterysnail
  Circomphalus Klein, 1853 -- valid
  Circomphalus strigillinus (Dall, 1902) -- valid -- empress venus
  Circulus Jeffreys, 1865 -- valid
  Circulus cosmius Bartsch, 1907 -- valid
  Circulus dalli Bush, 1897 -- valid
  Circulus liratus (Verrill, 1882) -- valid
  Circulus multistriatus (A. E. Verrill, 1884) -- valid -- threaded vitrinella
  Circulus rossellinus Dall, 1919 -- valid
  Circulus semisculptus (Olsson and McGinty, 1958) -- valid
  Circulus texanus (Moore, 1965) -- valid -- Texas vitrinella
  Cirsotrema Morch, 1852 -- valid
  Cirsotrema dalli Rehder, 1945 -- valid
  Cirsotrema pilsbryi (McGinty, 1940) -- valid
  Cittarium Philippi, 1847 -- valid
  Cittarium pica (Linnaeus, 1758) -- valid -- West Indian topsnail
  Clappia Walker, 1909 -- valid
  Clappia cahabensis Clench, 1965 -- valid -- Armored Siltsnail, Cahaba pebblesnail
  Clappia umbilicata (Walker, 1904) -- valid -- Pumpkin Siltsnail, umbilicate pebblesnail
  Clathromangelia di Monterosato, 1884 -- valid
  Clathromangelia fuscoligata (Dall, 1871) -- valid
  Clathromangelia interfossa (Carpenter, 1864) -- valid
  Clathurella Carpenter, 1857 -- valid
  Clathurella canfieldi (Dall, 1871) -- valid
  Clathurella capaniola (Dall, 1919) -- valid
  Clathurella eversoni Tippett, 1995 -- valid
  Clathurella rava (Hinds, 1843) -- valid
  Clathurella rigida (Hinds, 1843) -- valid
  Clinocardium Keen, 1936 -- valid
  Clinocardium blandum (Gould, 1850) -- valid -- low-rib cockle, smooth cockle
  Clinocardium californiense (Deshayes, 1839) -- valid -- Aleutian cockle, california cockle
  Clinocardium ciliatum (Fabricius, 1780) -- valid -- hairy cockle
  Clinocardium fucanum (Dall, 1907) -- invalid -- strait cockle
  Clinocardium nuttallii (Conrad, 1837) -- valid -- Nuttall cockle
  Clinopegma Grant and Gale, 1931 -- valid
  Clinopegma magnum (Dall, 1895) -- valid -- helmet whelk
  Clio Linnaeus, 1767 -- valid
  Clio chaptalii J. E. Gray, 1850 -- valid
  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
  Clione limacina (Phipps, 1774) -- valid
  Cliopsidae Costa, 1873 -- valid
  Cliopsis krohnii Troschel, 1854 -- valid
  Cocculina Dall, 1882 -- valid
  Cocculina rathbuni Dall, 1882 -- valid
  Cocculinidae Dall, 1882 -- valid
  Cochlespira Conrad, 1865 -- valid
  Cochlespira elegans (Dall, 1881) -- valid -- elegant star-turris
  Cochlespira radiata (Dall, 1889) -- valid -- lesser star-turris
  Cochlicella Ferussac, 1820 -- valid
  Cochlicella barbara (Linnaeus, 1758) -- valid -- potbellied helicellid
  Cochliolepis Stimpson, 1858 -- valid
  Cochliolepis holmesii (Dall, 1889) -- valid
  Cochliolepis parasitica Stimpson, 1858 -- valid -- parasitic scalesnail
  Cochliolepis striata Dall, 1889 -- valid -- striate scalesnail
  Cochliopa Stimpson, 1865 -- valid
  Cochliopa texana Pilsbry, 1935 -- invalid
  Cochliopina Morrison, 1946 -- valid
  Cochliopina riograndensis (Pilsbry and Ferriss, 1906) -- valid -- Spiral Pebblesnail
  Cochlodinella Pilsbry and Vanatta, 1898 -- valid
  Cochlodinella poeyana (d'Orbigny, 1841) -- valid -- truncate urocoptid
  Codakia Scopoli, 1777 -- valid
  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
  Coelostemma Dall, 1895 -- valid
  Coelostemma pyrgonasta F. G. Thompson, 1988 -- valid -- Bishop Cap tubesnail
  Collisella Dall, 1871 -- valid
  Collisella edmitchelli (Lipps, 1963) -- valid
  Colubraria Schumacher, 1817 -- valid
  Colubraria lanceolata (Menke, 1828) -- invalid -- arrow dwarf triton
  Colubraria testacea (Morch, 1852) -- valid -- obscure dwarf triton
  Columbella Lamarck, 1799 -- valid
  Columbella mercatoria (Linnaeus, 1758) -- valid -- West Indian dovesnail
  Columbella rusticoides Heilprin, 1886 -- valid -- rusty dovesnail
  Columbellidae Swainson, 1840 -- valid
  Columbellopsis Bucquoy, Dautzenberg and Dollfus, 1882 -- valid
  Columbellopsis nycteis (Duclos, 1846) -- valid -- fenestrate dovesnail
  Columella Westerlund, 1878 -- valid
  Columella columella (von Martens, 1830) -- valid -- mellow column
  Columella edentula (Draparnaud, 1805) -- valid -- toothless column
  Columella simplex (Gould, 1840) -- valid -- high-spire column
  Colus aphelus (Dall, 1890) -- valid -- oblique whelk
  Colus aurantius (Dall, 1907) -- valid -- broad-cord whelk
  Colus barbarinus Dall, 1919 -- valid -- Santa Barbara whelk
  Colus bristolensis Dall, 1919 -- valid
  Colus brunneus (Dall, 1877) -- valid -- brown whelk
  Colus callorhinus (Dall, 1877) -- valid -- strombiform whelk
  Colus capponius Dall, 1919 -- valid
  Colus errones Dall, 1919 -- valid -- wayward whelk
  Colus esychus (Dall, 1907) -- valid
  Colus georgianus (Dall, 1921) -- valid
  Colus griseus (Dall, 1890) -- valid -- gray whelk
  Colus halidonus Dall, 1919 -- valid
  Colus halimeris (Dall, 1919) -- valid
  Colus halli (Dall, 1873) -- invalid
  Colus hallii (Dall, 1873) -- valid
  Colus herendeenii (Dall, 1902) -- valid -- thin-ribbed whelk
  Colus holboellii (Moller, 1842) -- invalid
  Colus holbolli (Moller, 1842) -- valid
  Colus hypolispus (Dall, 1891) -- invalid -- oblique whelk, oblique whelk
  Colus incisus (Dall, 1919) -- valid
  Colus islandicus (Mohr, 1786) -- valid -- Iceland whelk
  Colus jordani (Dall, 1913) -- valid
  Colus kroyeri (Möller, 1842) -- valid -- Arctic whelk
  Colus lividus (Morch, 1862) -- invalid -- bruised whelk
  Colus martensi (Krause, 1885) -- valid
  Colus morditus (Dall, 1919) -- invalid -- shrew whelk
  Colus nobilis (Dall, 1919) -- invalid -- noble whelk
  Colus obesus (A. E. Verrill, 1884) -- invalid -- plump whelk
  Colus oceanodromae (Dall, 1919) -- valid -- seahorse whelk
  Colus ombronius Dall, 1919 -- valid -- shady whelk
  Colus parvus (Tiba, 1980) -- valid
  Colus periscelidus (Dall, 1891) -- valid -- garter whelk
  Colus pubescens (A. E. Verrill, 1882) -- valid -- hairy whelk
  Colus pulcius (Dall, 1919) -- valid
  Colus pygmaeus (Gould, 1841) -- valid -- pygmy whelk
  Colus roseus (Dall, 1877) -- valid -- rosy whelk
  Colus sabinii (J. E. Gray, 1824) -- valid
  Colus severinus (Dall, 1919) -- valid
  Colus spitzbergensis (Reeve, 1835) -- invalid -- thick-ribbed whelk, thick-ribbed whelk
  Colus stejnegeri (Dall, 1884) -- valid
  Colus stimpsoni (Mørch, 1867) -- valid
  Colus syrtensis (Packard, 1867) -- valid
  Colus terraenovae Bouchet and Waren, 1985 -- valid -- ventricose whelk
  Colus timetus (Dall, 1919) -- valid
  Colus trombinus (Dall, 1919) -- valid
  Colus trophius (Dall, 1919) -- valid
  Colus ventricosus (J. E. Gray, 1839) -- invalid -- ventricose whelk
  Colus verkruezeni (Kobelt, 1876) -- valid
  Colus virens (Dall, 1877) -- valid -- green 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
  Compsodrillia Woodring, 1928 -- valid
  Compsodrillia eucosmia (Dall, 1889) -- valid
  Compsodrillia haliostrephis (Dall, 1889) -- valid
  Compsodrillia tristicha (Dall, 1889) -- valid
  Compsomyax Stewart, 1930 -- valid
  Compsomyax subdiaphana (Carpenter, 1864) -- valid -- milky venus
  Conchocele Gabb, 1866 -- valid
  Conchocele bisecta (Conrad, 1849) -- valid -- giant cleftclam
  Condylocardiidae Bernard, 1897 -- valid
  Conidae Rafinesque, 1815 -- valid
  Conualevia Collier and Farmer, 1964 -- valid
  Conualevia alba Collier and Farmer, 1964 -- valid -- white smooth-horn doris
  Conualeviidae -- valid
  Conus Linnaeus, 1758 -- valid
  Conus amphiurgus Dall, 1889 -- valid
  Conus anabathrum Crosse, 1865 -- valid -- Florida cone
  Conus armiger Crosse, 1858 -- valid -- mace cone
  Conus attenuatus Reeve, 1844 -- valid -- slender cone
  Conus aureonimbosus Petuch, 1987 -- valid
  Conus binghamae Petuch, 1987 -- valid
  Conus californicus Hinds, 1844 -- valid -- California cone
  Conus cancellatus Hwass, 1792 -- valid -- cancellate cone
  Conus daucus Hwass, 1792 -- valid -- carrot cone
  Conus delessertii Recluz, 1843 -- valid
  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 floridensis G. B. Sowerby II, 1870 -- valid
  Conus glicksteini Petuch, 1987 -- valid
  Conus granulatus Linnaeus, 1758 -- valid -- glory-of-the-Atlantic cone
  Conus harasewychi Petuch, 1987 -- valid
  Conus jaspideus stearnsi Conrad, 1869 -- invalid -- dusky cone
  Conus mcgintyi Pilsbry, 1955 -- valid
  Conus mindanus Hwass, 1792 -- valid -- Bermuda cone
  Conus mus Hwass, 1792 -- valid -- mouse cone
  Conus patae Abbott, 1971 -- valid -- sunrise cone
  Conus pealii Green, 1830 -- valid
  Conus perryae Clench, 1942 -- valid
  Conus rainesae McGinty, 1953 -- valid
  Conus regius Gmelin, 1791 -- valid -- crown cone
  Conus sennottorum Rehder and Abbott, 1951 -- valid -- speckled cone
  Conus spurius Gmelin, 1791 -- valid -- alphabet cone
  Conus stearnsi Conrad, 1869 -- invalid
  Conus stearnsii Conrad, 1869 -- valid
  Conus stimpsoni Dall, 1902 -- valid -- yellow cone
  Conus villepinii P. Fischer and Bernardi, 1857 -- valid
  Conus villepinii fosteri Clench and Aguayo, 1942 -- valid
  Conus villepinii villepinii P. Fischer and Bernardi, 1857 -- valid
  Conus ziczac Megerle von Muhlfeld, 1816 -- valid
  Cooperella atlantica Rehder, 1943 -- valid -- Atlantic cooperclam
  Cooperella subdiaphana (Carpenter, 1864) -- valid -- shiny cooperclam
  Cooperellidae Dall, 1900 -- invalid
  Coralliophaga de Blainville, 1824 -- valid
  Coralliophaga coralliophaga (Gmelin, 1791) -- valid -- coralclam
  Coralliophila H. Adams and A. Adams, 1853 -- valid
  Coralliophila aberrans (C. B. Adams, 1850) -- valid -- globose coralsnail
  Coralliophila aedonia (Watson, 1886) -- valid
  Coralliophila caribaea Abbott, 1958 -- valid -- Caribbean coralsnail
  Coralliophila costata (de Blainville, 1832) -- valid -- California coralsnail
  Coralliophila galea (Reeve, 1846) -- valid -- helmet coralsnail
  Coralliophila lactuca Dall, 1889 -- invalid
  Coralliophila pacei Petuch, 1987 -- valid
  Coralliophila richardi (P. Fischer, 1882) -- valid
  Coralliophila scalariformis (Lamarck, 1822) -- valid -- staircase coralsnail
  Coralliophilidae Chenu, 1859 -- valid
  Corambe Bergh, 1869 -- valid
  Corambe obscura (A. E. Verrill, 1870) -- valid -- obscure corambe
  Corambidae Bergh, 1869 -- valid
  Corbicula Megerle von Mühlfeld, 1811 -- valid
  Corbicula fluminea (O. F. Müller, 1774) -- valid -- Asian clam
  Corbiculidae Gray, 1847 -- valid
  Corbula Bruguiere, 1797 -- valid
  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 cymella Dall, 1881 -- valid -- wavy corbula
  Corbula dietziana C. B. Adams, 1852 -- valid -- dietz corbula, rose corbula
  Corbula krebsiana C. B. Adams, 1852 -- valid -- Krebs corbula
  Corbula swiftiana C. B. Adams, 1852 -- valid -- radial-ridged corbula, swift corbula
  Corbulidae Lamarck, 1818 -- valid
  Cornirostridae -- valid
  Corolla Dall, 1871 -- valid
  Corolla calceola (A. E. Verrill, 1880) -- valid -- Atlantic corolla
  Corolla intermedia (Tesch, 1903) -- valid
  Corolla ovata (Quoy and Gaimard, 1832) -- valid
  Corolla spectabilis Dall, 1871 -- valid -- spectacular corolla
  Coryphella cooperi Cockerell, 1901 -- invalid -- blue-patch aeolis
  Coryphella diversa (Couthouy, 1839) -- invalid
  Coryphella fusca O'Donoghue, 1921 -- invalid -- predaceous aeolis
  Coryphella gracilis (Alder and Hancock, 1844) -- invalid
  Coryphella iodinea (J. G. Cooper, 1863) -- invalid -- purple aeolis
  Coryphella longicaudata O'donoghue, 1922 -- invalid -- long-tail aeolis
  Coryphella nobilis A. E. Verrill, 1880 -- invalid
  Coryphella pellucida (Alder and Hancock, 1843) -- invalid -- pellucid aeolis
  Coryphella pricei MacFarland, 1966 -- invalid -- smooth-tooth aeolis
  Coryphella rufibranchialis (Johnston, 1832) -- invalid
  Coryphella salmonacea (Couthouy, 1838) -- invalid -- salmon aeolis
  Coryphella subrosacea (Eschscholtz, 1831) -- invalid
  Coryphella trilineata O'Donoghue, 1921 -- invalid -- three-line aeolis
  Coryphella trophina (Bergh, 1894) -- invalid
  Coryphella verrucosa (M. Sars, 1829) -- invalid
  Coryphella verrucosa rufibranchialis (Johnston, 1832) -- invalid -- red-finger aeolis
  Coryphella verrucosa verrucosa (M. Sars, 1829) -- invalid
  Cosmioconcha Dall, 1913 -- valid
  Cosmioconcha calliglypta (Dall and Simpson, 1901) -- valid -- flame dovesnail
  Cosmotriphora Olsson and Harbison, 1953 -- valid
  Cosmotriphora decorata (C. B. Adams, 1850) -- valid -- mottled triphora
  Cosmotriphora melanura (C. B. Adams, 1850) -- valid -- white Atlantic triphora
  Cosmotriphora olivacea (Dall, 1889) -- valid
  Costasiella Pruvoa-Fol, 1951 -- valid
  Costasiella nonatoi Ev. Marcus and Er. Marcus, 1960 -- valid
  Costasiella ocellifera (Simroth, 1895) -- valid -- eyespot costasiella
  Costasiellidae -- valid
  Costellariidae -- valid
  Costoanachis Sacco, 1890 -- valid
  Costoanachis avara (Say, 1822) -- valid -- greedy dovesnail
  Costoanachis catenata (G. B. Sowerby II, 1844) -- valid -- chain dovesnail
  Costoanachis floridana (Rehder, 1939) -- valid -- Florida dovesnail
  Costoanachis lafresnayi (P. Fischer and Bernardi, 1857) -- valid -- well-ribbed dovesnail
  Costoanachis semiplicata (Stearns, 1873) -- valid -- Gulf dovesnail
  Costoanachis similis (Ravenel, 1861) -- valid
  Costoanachis sparsa (Reeve, 1859) -- valid -- sparse dovesnail
  Couthouyella Bartsch, 1909 -- valid
  Couthouyella striatula (Couthouy, 1838) -- valid -- northern rough wentletrap
  Cranopsis A. Adams, 1860 -- valid
  Cranopsis asturiana (P. Fischer, 1882) -- valid -- Atlantic puncturella
  Cranopsis billsae (Perez Farfante, 1947) -- valid
  Cranopsis cucullata (Gould, 1846) -- valid -- hood puncturella
  Cranopsis decorata (I. M. Cowan and J. H. McLean, 1968) -- valid -- painted puncturella
  Cranopsis erecta (Dall, 1889) -- valid -- erect puncturella
  Cranopsis granulata (Seguenza, 1862) -- valid -- granulate puncturella
  Cranopsis major (Dall, 1891) -- valid -- great puncturella
  Cranopsis multistriata (Dall, 1914) -- valid -- many-rib puncturella
  Crassadoma Bernard, 1986 -- valid
  Crassadoma gigantea (J. E. Gray, 1825) -- valid -- giant rock-scallop
  Crassatellidae Ferussac, 1822 -- valid
  Crassedoma Bernard, 1986 -- invalid
  Crassedoma giganteum (J. E. Gray, 1825) -- invalid -- giant rock scallop
  Crassinella Guppy, 1874 -- valid
  Crassinella dupliniana (Dall, 1903) -- valid -- pointed crassinella
  Crassinella lunulata (Conrad, 1834) -- valid -- lunate crassinella
  Crassinella martinicensis (d'Orbigny, 1842) -- valid -- Martinique crassinella
  Crassinella pacifica (C. B. Adams, 1852) -- valid -- Pacific crassinella
  Crassispira Swainson, 1840 -- valid
  Crassispira cubana (Melvill, 1923) -- valid
  Crassispira fuscescens (Reeve, 1845) -- valid
  Crassispira montereyensis Stearns, 1871 -- valid
  Crassispira phasma Schwengel, 1940 -- valid
  Crassispira rhythmica Melvill, 1927 -- valid
  Crassispira semiinflata (Grant and Gale, 1931) -- valid
  Crassostrea Sacco, 1897 -- valid
  Crassostrea ariakensis (Fujita, 1913) -- valid -- Suminoe oyster
  Crassostrea gigas (Thunberg, 1793) -- valid -- Pacific giant oyster, Pacific oyster
  Crassostrea virginica (Gmelin, 1791) -- valid -- eastern oyster
  Cratena Bergh, 1864 -- valid
  Cratena pilata (Gould, 1870) -- valid
  Creedonia Martins, 1996 -- valid
  Creedonia succinea (Pfeiffer, 1854) -- valid
  Crenella T. Brown, 1827 -- valid
  Crenella decussata (Montagu, 1808) -- valid -- cross-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 pectinula (Gould, 1841) -- valid -- little-comb crenella
  Crenella seminuda (Dall, 1897) -- invalid -- partly-sculptured crenella
  Crenella skomma (Schwengel, 1944) -- valid -- joking crenella
  Crepidula Lamarck, 1799 -- valid
  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 glottidiarum Dall, 1905 -- valid
  Crepidula grandis Middendorff, 1849 -- valid -- great slippersnail
  Crepidula maculosa Conrad, 1846 -- valid -- spotted slippersnail
  Crepidula naticarum Williamson, 1905 -- valid -- cheeky slippersnail
  Crepidula norrisiarum Williamson, 1905 -- valid
  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 Lesson, 1831 -- valid
  Crepipatella dorsata (Broderip, 1834) -- valid -- Pacific half-slippersnail
  Crepipatella orbiculata (Dall, 1919) -- valid -- round slippersnail
  Creseis Rang, 1828 -- valid
  Creseis acicula (Rang, 1828) -- valid -- straight needle-pteropod
  Creseis virgula (Rang, 1828) -- valid -- curved needle-pteropod
  Crimora Alder and Hancock, 1855 -- valid
  Crimora coneja Er. Marcus, 1961 -- valid -- rabbit doris
  Crockerella Hertlein and Strong, 1951 -- valid
  Crockerella castianira (Dall, 1919) -- valid
  Crockerella conradiana (Gabb, 1869) -- valid
  Crockerella crystallina (Gabb, 1865) -- valid
  Crockerella cymodoce (Dall, 1919) -- valid
  Crockerella eriphyle (Dall, 1919) -- valid
  Crockerella evadne (Dall, 1919) -- valid
  Crockerella lowei (Dall, 1903) -- valid
  Crockerella philodice (Dall, 1919) -- valid
  Crockerella scotti J. H. McLean, 1996 -- valid
  Crockerella tridesmia (S. S. Berry, 1941) -- valid
  Crossata Jousseaume, 1881 -- valid
  Crossata californica (Hinds, 1843) -- valid -- California frogsnail
  Crucibulum Schumacher, 1817 -- valid
  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
  Cryoturris Woodring, 1928 -- valid
  Cryoturris cerinella (Dall, 1889) -- valid -- waxy mangelia
  Cryoturris fargoi McGinty, 1955 -- valid
  Cryoturris filifera (Dall, 1881) -- valid
  Cryoturris quadrilineata (C. B. Adams, 1850) -- valid
  Cryptobranchia Middendorff, 1851 -- valid
  Cryptobranchia alba Dall, 1869 -- valid -- white blind limpet
  Cryptobranchia concentrica (Middendorff, 1851) -- valid -- ringed blind limpet
  Cryptochiton Middendorff, 1847 -- valid
  Cryptochiton stelleri (Middendorff, 1847) -- valid -- giant Pacific chiton
  Cryptoconchus Blainville in Burrow, 1815 -- valid
  Cryptoconchus floridanus (Dall, 1889) -- valid -- white-barred chiton
  Cryptomastix Pilsbry, 1939 -- valid
  Cryptomastix devia (Gould, 1846) -- valid -- Puget oregonian
  Cryptomastix germana (Gould, 1851) -- valid -- pygmy oregonian
  Cryptomastix harfordiana (W. G. Binney, 1886) -- valid -- Salmon 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 Conrad, 1848 -- valid
  Cryptomya californica (Conrad, 1837) -- valid -- California softshell, california softshell clam
  Cryptonatica Dall, 1892 -- valid
  Cryptonatica affinis (Gmelin, 1791) -- valid -- Arctic moonsnail
  Cryptonatica aleutica (Dall, 1919) -- valid
  Cryptonatica janthostoma (Deshayes, 1839) -- valid -- purplemouth moonsnail
  Cryptonatica russa (Gould, 1859) -- valid
  Cryptopecten Dall, Bartsch and Rehder, 1938 -- valid
  Cryptopecten phrygium (Dall, 1886) -- valid -- spathate scallop
  Cryptostrea Harry, 1985 -- invalid
  Cryptostrea permollis (G. B. Sowerby II, 1871) -- invalid -- sponge oyster
  Cumanotidae -- valid
  Cumanotus Odhner, 1907 -- valid
  Cumanotus fernaldi T. E. Thompson and G. H. Brown, 1984 -- valid -- polyp aeolis
  Cumberlandia Ortmann, 1912 -- invalid
  Cumberlandia monodonta (Say, 1829) -- invalid -- spectaclecase
  Cumingia G. B. Sowerby I, 1833 -- valid
  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 Hedley, 1902 -- valid
  Cuna dalli Vanatta, 1904 -- valid -- dall condylclam, trigonal condylclam
  Curtitoma Bartsch, 1941 -- valid
  Curtitoma decussata (Couthuoy, 1839) -- valid
  Curtitoma fiora (Dall, 1919) -- valid
  Curtitoma incisula (A. E. Verrill, 1882) -- valid
  Curtitoma lawrenciana (Dall, 1919) -- valid
  Curtitoma novajasemljensis (Leche, 1878) -- valid
  Curtitoma trevelliana (Turton, 1834) -- valid
  Curtitoma violacea (Mighels and C. B. Adams, 1842) -- valid
  Cuspidaria Nardo, 1840 -- valid
  Cuspidaria alternata (d'Orbigny, 1842) -- valid -- alternate dipperclam
  Cuspidaria glacialis (G. O. Sars, 1878) -- valid -- glacial 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
  Cuspidariidae Dall, 1886 -- valid
  Cuthona Alder and Hancock, 1855 -- valid
  Cuthona abronia (MacFarland, 1966) -- valid -- colorful cuthona
  Cuthona albocrusta (MacFarland, 1966) -- valid -- white-crust cuthona
  Cuthona caerulea (Montagu, 1804) -- valid
  Cuthona cocoachroma Williams and Gosliner, 1979 -- valid -- brown cuthona
  Cuthona concinna (Alder and Hancock, 1843) -- valid
  Cuthona divae (Er. Marcus, 1961) -- valid -- rose-pink cuthona
  Cuthona flavovulta (MacFarland, 1966) -- valid -- yellowish cuthona
  Cuthona fulgens (MacFarland, 1966) -- valid -- black-and-yellow cuthona
  Cuthona hamanni Behrens, 1987 -- valid
  Cuthona lagunae (O'Donoghue, 1926) -- valid -- orange-face cuthona
  Cuthona nana (Alder and Hancock, 1842) -- valid
  Cuthona perca (Er. Marcus, 1958) -- valid -- lake merritt cuthona
  Cuthona phoenix Gosliner, 1981 -- valid -- bornagain cuthona
  Cuthona punicea Millen, 1986 -- valid
  Cuthona pustulata (Alder and Hancock, 1854) -- valid
  Cuthona rolleri Behrens and Gosliner, 1988 -- valid
  Cuthona tina (Er. Marcus, 1957) -- valid
  Cuthona veronica (A. E. Verrill, 1860) -- invalid
  Cuthona veronicae (A. E. Verrill, 1880) -- valid
  Cuthona virens (MacFarland, 1966) -- valid -- green cuthona
  Cuthona viridis (Forbes, 1840) -- valid
  Cuvierina Boas, 1886 -- valid
  Cuvierina columnella (Rang, 1827) -- valid -- cigar pteropod
  Cyathodonta Conrad, 1849 -- valid
  Cyathodonta pedroana Dall, 1915 -- valid -- San Pedro thraciid
  Cyclinella Dall, 1902 -- valid
  Cyclinella tenuis (Recluz, 1852) -- valid -- thin cyclinella
  Cyclocardia Conrad, 1867 -- valid
  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 crassidens (Broderip and G. B. Sowerby I, 1829) -- valid -- thick cyclocardia
  Cyclocardia crebricostata (Krause, 1885) -- valid -- many-rib cyclocardia, many-ribbed cyclocardia
  Cyclocardia gouldii (Dall, 1903) -- valid -- Gould 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 umnaka (Willett, 1932) -- valid -- Aleutian cyclocardia, umnak cyclocardia
  Cyclocardia ventricosa (Gould, 1850) -- valid -- stout cyclocardia
  Cyclonaias Pilsbry in Ortmann & Walker, 1922 -- valid
  Cyclonaias tuberculata (Rafinesque, 1820) -- valid -- purple wartyback
  Cyclopecten A. E. Verrill, 1897 -- valid
  Cyclopecten barbarensis Grau, 1959 -- valid -- Santa Barbara glass-scallop, santa barbara scallop
  Cyclopecten catalinensis (Willett, 1931) -- valid -- Catalina glass-scallop, catalina scallop
  Cyclopecten davidsoni (Dall, 1897) -- valid -- salmon glass-scallop
  Cyclopecten greenlandicus (G. B. Sowerby II, 1842) -- valid -- Greenland glass-scallop
  Cyclopecten imbrifer (Loven, 1847) -- valid -- shingle glass-scallop
  Cyclopecten leptaleum (A. E. Verrill, 1884) -- valid
  Cyclopecten nanus A. E. Verrill and Bush, 1897 -- valid -- adwarf scallop, dwarf glass-scallop
  Cyclopecten reticulum (Dall, 1886) -- valid
  Cyclopecten ringnesius (Dall, 1924) -- valid -- Ringnes glass-scallop
  Cyclopecten thalassinus (Dall, 1886) -- valid -- cancellate dwarf scallop, costate glass-scallop
  Cyclostrema Marryat, 1818 -- valid
  Cyclostrema cancellatum Marryat, 1818 -- valid -- cancellate cyclostreme
  Cyclostrema huesonicum (Dall, 1927) -- valid -- Key West cyclostreme
  Cyclostrema tortuganum (Dall, 1927) -- valid -- Tortugas cyclostreme
  Cyclostremella Bush, 1897 -- valid
  Cyclostremella concordia Bartsch, 1920 -- valid
  Cyclostremella humilis Bush, 1897 -- valid
  Cyclostremiscus Pilsbry and Olsson, 1945 -- valid
  Cyclostremiscus beauii (P. Fischer, 1857) -- valid
  Cyclostremiscus cubanus (Pilsbry and Aguayo, 1933) -- valid
  Cyclostremiscus jeannae Pilsbry and McGinty, 1946 -- valid
  Cyclostremiscus pentagonus (Gabb, 1873) -- valid
  Cyclostremiscus suppressus (Dall, 1889) -- valid -- suppressed vitrinella
  Cyclothyca Stearns, 1891 -- valid
  Cyclothyca pacei Petuch, 1987 -- valid
  Cyerce Bergh, 1871 -- valid
  Cyerce antillensis Engel, 1927 -- valid -- Antilles glass-slug
  Cyerce cristallina (Trinchese, 1881) -- valid -- harlequin glass-slug
  Cylichna Loven, 1846 -- valid
  Cylichna alba (T. Brown, 1827) -- valid -- white chalice-bubble
  Cylichna attonsa Carpenter, 1865 -- valid
  Cylichna diegensis (Dall, 1919) -- valid -- San Diego chalice-bubble
  Cylichna eburnea A. E. Verrill, 1885 -- valid -- ivory chalice-bubble
  Cylichna gouldii (Couthouy, 1839) -- valid
  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
  Cylichnidae A. Adams, 1850 -- valid
  Cylindrobulla P. Fischer, 1857 -- valid
  Cylindrobulla beauii P. Fischer, 1857 -- valid
  Cylindrobullidae -- valid
  Cymakra Gardner, 1937 -- valid
  Cymakra aspera (Carpenter, 1864) -- valid
  Cymakra gracilior (Tryon, 1884) -- valid
  Cymatioa Berry, 1964 -- valid
  Cymatioa electilis (S. S. Berry, 1963) -- valid -- wavy-edged kellyclam
  Cymatium Roding, 1798 -- valid
  Cymatium aquatile (Reeve, 1844) -- valid
  Cymatium comptum (A. Adams, 1855) -- valid -- dwarf triton
  Cymatium corrugatum (Lamarck, 1816) -- valid
  Cymatium corrugatum amictum (Reeve, 1844) -- valid
  Cymatium corrugatum krebsii (Morch, 1877) -- valid
  Cymatium cynocephalum (Lamarck, 1816) -- valid -- doghead triton
  Cymatium femorale (Linnaeus, 1758) -- valid -- angular triton
  Cymatium labiosum (W. Wood, 1828) -- valid -- lip triton
  Cymatium martinianum (d'Orbigny, 1846) -- valid -- hairy triton
  Cymatium mundum (Gould, 1849) -- valid
  Cymatium muricinum (Roding, 1798) -- valid -- knobbed triton
  Cymatium nicobaricum (Roding, 1798) -- valid -- goldmouth triton
  Cymatium occidentale (Morch, 1877) -- valid
  Cymatium parthenopeum (von Salis, 1793) -- valid -- giant triton
  Cymatium pfeifferianum (Reeve, 1844) -- valid
  Cymatium ridleyi (E. A. Smith, 1890) -- valid -- twisted triton
  Cymatium tenuiliratum (Lischke, 1873) -- valid -- slender triton
  Cymatium vespaceum (Lamarck, 1822) -- valid
  Cymatoica Dall, 1889 -- valid
  Cymatoica orientalis (Dall, 1890) -- valid -- western tellin
  Cymatosyrinx Dall, 1889 -- valid
  Cymatosyrinx hemphilli (Stearns, 1871) -- valid
  Cymatosyrinx johnsoni Arnold, 1903 -- valid
  Cymbovula Cate, 1974 -- valid
  Cymbovula acicularis (Lamarck, 1810) -- valid -- West Indian simnia
  Cymbulia Peron and Lesueur, 1810 -- valid
  Cymbulia peronii de Blainville, 1818 -- valid
  Cymbuliidae Gray, 1840 -- valid
  Cyphoma Roding, 1798 -- valid
  Cyphoma alleneae Cate, 1973 -- valid
  Cyphoma aureocinctum (Dall, 1889) -- valid -- gold-line cyphoma
  Cyphoma gibbosum (Linnaeus, 1758) -- valid -- flamingo tongue
  Cyphoma lindae Petuch, 1987 -- valid
  Cyphoma mcgintyi Pilsbry, 1939 -- valid
  Cyphoma mcgintyi mcgintyi Pilsbry, 1939 -- valid
  Cyphoma mcgintyi robustior F. M. Bayer, 1941 -- valid
  Cyphoma rhomba Cate, 1978 -- valid -- bullroarer cyphoma
  Cyphoma sedlaki Cate, 1976 -- valid
  Cyphoma signatum Pilsbry and McGinty, 1939 -- valid -- fingerprint cyphoma
  Cypraea spurca acicularis Gmelin, 1791 -- invalid -- atlantic yellow cowrie
  Cypraecassis Stutchbury, 1837 -- valid
  Cypraecassis testiculus (Linnaeus, 1758) -- valid -- reticulate cowrie-helmet
  Cypraeidae Rafinesque, 1815 -- valid
  Cyprogenia Agassiz, 1852 -- valid
  Cyprogenia aberti (Conrad, 1850) -- valid -- western fanshell
  Cyprogenia stegaria (Rafinesque, 1820) -- valid -- fanshell
  Cyrenoida Joannis, 1835 -- valid
  Cyrenoida floridana (Dall, 1896) -- valid -- Florida marshclam
  Cyrenoididae H. and A. Adams, 1857 -- valid
  Cyrtodaria Reuss, 1801 -- valid
  Cyrtodaria kurriana Dunker, 1861 -- valid -- Kurr propellerclam
  Cyrtodaria siliqua (Spengler, 1793) -- valid -- northern propellerclam
  Cyrtonaias Crosse & Fischer, 1894 -- valid
  Cyrtonaias tampicoensis (Lea, 1838) -- valid -- Tampico pearly mussel
  Cyrtopleura Tryon, 1862 -- valid
  Cyrtopleura costata (Linnaeus, 1758) -- valid -- angelwing
  Cystiscidae -- valid
  Cystiscus Stimpson, 1865 -- valid
  Cystiscus jewetti (Carpenter, 1856) -- invalid
  Cystiscus politulus (Dall, 1919) -- invalid -- polite marginella
  Cystiscus politus (Carpenter, 1857) -- valid -- polished marginella
  Cystiscus subtrigonus (Carpenter, 1864) -- invalid -- triangular marginella
  Cythnia Carpenter, 1864 -- valid
  Cythnia albida Carpenter, 1864 -- valid
  Dacrydium Torell, 1859 -- valid
  Dacrydium elegantulum Soot-Ryen, 1955 -- valid -- elegant mussel
  Dacrydium elegantulum hendersoni Salas and Gofas, 1997 -- valid
  Dacrydium pacificum Dall, 1916 -- valid -- Pacific glassy-mussel
  Dacrydium vitreum (Moller, 1842) -- valid -- Arctic glassy-mussel, glassy mussel
  Daedalochila Beck, 1837 -- valid
  Daedalochila auriculata (Say, 1818) -- valid -- Ocala liptooth
  Daedalochila auriformis (Bland, 1859) -- valid -- rockpile liptooth
  Daedalochila avara (Say, 1818) -- valid -- Florida liptooth
  Daedalochila chisosensis (Pilsbry, 1936) -- valid -- Chisos liptooth
  Daedalochila delecta (Hubricht, 1976) -- valid -- Gulf Hammock liptooth
  Daedalochila hausmani (Jackson, 1948) -- valid -- Dixie liptooth
  Daedalochila hippocrepis (Pfeiffer, 1848) -- valid -- horseshoe liptooth
  Daedalochila leporina (Gould, 1848) -- valid -- Gulf Coast liptooth
  Daedalochila peninsulae (Pilsbry, 1940) -- valid -- St. Johns liptooth
  Daedalochila polita (Pilsbry and Hinkley, 1907) -- valid -- suave liptooth
  Daedalochila postelliana (Bland, 1859) -- valid -- coastal liptooth
  Daedalochila scintilla (Pilsbry and Hubricht, 1962) -- valid
  Daedalochila subclausa (Pilsbry, 1899) -- valid -- Suwannee liptooth
  Daedalochila triodontoides (Bland, 1861) -- valid -- marsh liptooth
  Daedalochila uvulifera (Shuttleworth, 1852) -- valid -- peninsula liptooth
  Daphnella Hinds, 1844 -- valid
  Daphnella clathrata Gabb, 1865 -- valid
  Daphnella corbicula Dall, 1889 -- valid
  Daphnella lymneiformis (Kiener, 1840) -- valid -- volute daphnelle
  Daphnella margaretae Lyons, 1972 -- valid
  Daphnella reticulosa Dall, 1889 -- valid
  Daphnella retifera Dall, 1889 -- valid
  Daphnella stegeri McGinty, 1955 -- valid
  Dasyscias F. G. Thompson and Hershler, 1991 -- valid
  Dasyscias franzi F. G. Thompson and Hershler, 1991 -- valid -- Shaggy Ghostsnail
  Decoriatrivia Cate, 1979 -- valid
  Decoriatrivia ritteri (Raymond, 1903) -- valid
  Delectopecten Stewart, 1930 -- valid
  Delectopecten randolphi (Dall, 1897) -- invalid -- Randolph scallop
  Delectopecten vancouverensis (Whiteaves, 1893) -- valid -- Vancouver scallop
  Delectopecten vitreus (Gmelin, 1791) -- valid -- vitreous scallop
  Dendostrea Swainson, 1835 -- valid
  Dendostrea frons (Linnaeus, 1758) -- valid -- frond oyster
  Dendrodorididae Pruvot-Fol, 1935 -- valid
  Dendrodoris Ehrenberg, 1831 -- valid
  Dendrodoris fulva (MacFarland, 1905) -- valid -- yellow porostome
  Dendrodoris krebsii (Morch, 1863) -- valid
  Dendrodoris nigromaculata (Cockerell, 1905) -- valid -- black-spot porostome
  Dendrodoris warta Ev. Marcus and Er. Marcus, 1976 -- valid
  Dendronotidae Gray, 1857 -- valid
  Dendronotus Alder and Hancock, 1845 -- valid
  Dendronotus albopunctatus Robilliard, 1972 -- valid
  Dendronotus albus MacFarland, 1966 -- valid -- white frond-aeolis
  Dendronotus dalli Bergh, 1879 -- valid
  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
  Dendropoma Morch, 1861 -- valid
  Dendropoma corrodens (d'Orbigny, 1842) -- valid -- ringed wormsnail
  Dendropoma exsertum (Dall, 1881) -- valid
  Dendropoma irregulare (d'Orbigny, 1842) -- valid -- irregular wormsnail
  Dendropoma lituella (Morch, 1861) -- valid -- flat wormsnail
  Dendropoma rastrum (Morch, 1861) -- valid -- California wormsnail
  Dentaliida da Costa, 1776 -- valid
  Dentaliidae Children, 1834 -- valid
  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 Cossmann, 1899 -- valid
  Dentimargo aureocinctus (Stearns, 1872) -- valid -- gold-line marginella
  Dentimargo eburneolus (Conrad, 1834) -- valid -- tan marginella
  Dentimargo idiochila (Schwengel, 1943) -- valid
  Dentimargo reductus (Bavay, 1922) -- valid
  Dentimargo smithii (A. E. Verrill, 1885) -- valid
  Dentistyla Dall, 1889 -- valid
  Dentistyla asperrima (Dall, 1881) -- valid -- rough topsnail
  Depressiscala de Boury, 1909 -- valid
  Depressiscala nautlae (Morch, 1874) -- valid -- slender wentletrap
  Depressiscala nitidella (Dall, 1889) -- valid -- mottled wentletrap
  Depressiscala polita (G. B. Sowerby II, 1844) -- valid -- polished wentletrap
  Dermatomya Dall, 1889 -- valid
  Dermatomya buttoni Dall, 1916 -- valid -- yellow poromya
  Dermatomya mactroides (Dall, 1889) -- valid -- trigonal poromya
  Dermomurex di Monterosato, 1890 -- valid
  Dermomurex abyssicola (Crosse, 1865) -- valid
  Dermomurex elizabethae (McGinty, 1940) -- valid
  Dermomurex glicksteini Petuch, 1987 -- valid
  Dermomurex pacei Petuch, 1988 -- valid
  Dermomurex pauperculus (C. B. Adams, 1850) -- valid -- beggar aspella
  Deroceras Rafinesque, 1820 -- valid
  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 panormitanum (Lessona and Pollonera, 1882) -- valid -- longneck fieldslug
  Deroceras reticulatum (Muller, 1774) -- valid -- gray field slug, gray fieldslug
  Desmopteridae Dall, 1921 -- valid
  Desmopterus Chun, 1889 -- valid
  Desmopterus pacificus Essenberg, 1919 -- valid
  Desmopterus papilio Chun, 1889 -- valid
  Diacavolinia Van der Spoel, 1987 -- valid
  Diacavolinia deblainvillei van der Spoel, Bleeker and Kobayashi, 1993 -- valid
  Diacavolinia deshayesi van der Spoel, Bleeker and Kobayashi, 1993 -- valid
  Diacavolinia elegans van der Spoel, Bleeker and Kobayashi, 1993 -- valid
  Diacavolinia ovalis van der Spoel, Bleeker and Kobayashi, 1993 -- valid
  Diacria Gray, 1847 -- valid
  Diacria danae van Leyen and van der Spoel, 1982 -- valid
  Diacria maculata Bleeker and van der Spoel, 1988 -- valid
  Diacria major (Boas, 1886) -- valid
  Diacria rampali Dupont, 1979 -- valid
  Diacria trispinosa (de Blainville, 1821) -- valid -- three-spine cavoline
  Diaphana Brown, 1827 -- valid
  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, Arctic paperbubble, weak paper-bubble
  Diaphanidae Odhner, 1922 -- valid
  Diaphorodoris Iredale and O'Donoghue, 1923 -- valid
  Diaphorodoris lirulatocauda Millen, 1985 -- valid
  Diaulula Bergh, 1879 -- valid
  Diaulula sandiegensis (J. G. Cooper, 1863) -- valid -- ringed doris
  Didianema Woodring, 1928 -- valid
  Didianema pauli Pilsbry and McGinty, 1945 -- valid
  Dimya Roualt, 1848 -- valid
  Dimya argentea Dall, 1886 -- valid -- silver dimyid
  Dimya californiana S. S. Berry, 1936 -- valid -- California dimyid
  Dimyidae P. Fischer, 1887 -- valid
  Dinocardium Dall, 1900 -- valid
  Dinocardium robustum (Lightfoot, 1786) -- valid -- Atlantic giant cockle
  Diodora J. E. Gray, 1821 -- valid
  Diodora aguayoi Perez Farfante, 1943 -- valid
  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 dysoni (Reeve, 1850) -- valid
  Diodora fluviana (Dall, 1889) -- valid -- Gulf Stream keyhole limpet
  Diodora jaumei Aguayo and Rehder, 1936 -- valid
  Diodora listeri (d'Orbigny, 1842) -- valid
  Diodora meta (von Ihering, 1927) -- valid
  Diodora minuta (Lamarck, 1822) -- valid -- dwarf keyhole limpet
  Diodora sayi (Dall, 1889) -- valid
  Diodora tanneri (A. E. Verrill, 1882) -- valid
  Diodora variegata G. B. Sowerby II, 1862 -- valid -- variegate keyhole limpet
  Diodora viridula (Lamarck, 1822) -- valid -- green keyhole limpet
  Diodora wetmorei Perez Farfante, 1945 -- valid
  Diplodonta Bronn, 1831 -- valid
  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 diplodon, nut-shaped diplodon
  Diplodonta orbella (Gould, 1851) -- valid -- orb diplodon
  Diplodonta punctata (Say, 1822) -- valid -- Atlantic diplodon
  Diplodonta semiaspera Philippi, 1836 -- valid -- pimpled diplodon
  Diplodonta sericata (Reeve, 1850) -- valid -- flat 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 -- inflated diplodon, verrill diplodon
  Diplosolenodes Thome, 1976 -- valid
  Diplosolenodes occidentale (Guilding, 1825) -- valid -- spotted leatherleaf
  Diplothyra Tryon, 1862 -- valid
  Diplothyra smithii Tryon, 1862 -- valid -- oyster piddock
  Dirona MacFarland, 1905 -- valid
  Dirona albolineata MacFarland, 1905 -- valid -- white-line dirona
  Dirona aurantia Hurst, 1966 -- valid -- golden dirona
  Dirona picta MacFarland, 1905 -- valid -- painted dirona
  Dironidae Eliot, 1910 -- valid
  Discidae -- valid
  Discodorididae -- valid
  Discodoris Bergh, 1877 -- valid
  Discodoris alba White, 1952 -- valid
  Discodoris evelinae Er. Marcus, 1955 -- valid
  Discodoris mortenseni Ev. Marcus and Er. Marcus, 1963 -- valid
  Discodoris phoca Ev. Marcus and Er. Marcus, 1967 -- valid
  Discodoris purcina Ev. Marcus and Er. Marcus, 1967 -- valid
  Disconaias Crosse & Fischer, 1894 -- valid
  Disconaias salinasensis (Simpson, 1908) -- invalid -- Salina mucket
  Discotectonica Marwick, 1931 -- valid
  Discotectonica discus (Philippi, 1844) -- valid -- keeled sundial
  Discurria Lindberg, 1988 -- valid
  Discurria insessa (Hinds, 1842) -- valid -- seaweed limpet
  Discus Fitzinger, 1833 -- valid
  Discus brunsoni S. S. Berry, 1955 -- valid -- lake disc
  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 cronkhitei (Newcomb, 1865) -- invalid -- forest 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
  Discus selenitoides (Pilsbry, 1890) -- valid -- file disc
  Discus shimekii (Pilsbry, 1890) -- valid -- striate disc
  Discus whitneyi (Newcomb, 1864) -- valid -- forest disc
  Distorsio Roding, 1798 -- valid
  Distorsio clathrata (Lamarck, 1816) -- valid -- Atlantic distorsio
  Distorsio constricta Broderip, 1833 -- valid
  Distorsio constricta macgintyi Emerson and Puffer, 1953 -- invalid
  Distorsio constricta mcgintyi Emerson and Puffer, 1953 -- valid
  Distorsio perdistorta Fulton, 1938 -- valid -- hunchback distorsio
  Divalinga Chavan, 1951 -- valid
  Divalinga quadrisulcata (d'Orbigny, 1842) -- valid -- cross-hatched lucine
  Divaricella von Martens, 1880 -- valid
  Divaricella dentata (W. Wood, 1815) -- valid -- dentate lucine
  Divariscintilla Powell, 1932 -- valid
  Divariscintilla cordiformis P. M. Mikkelsen and Bieler, 1992 -- valid -- heart-shaped galeommatid
  Divariscintilla luteocrinita P. M. Mikkelsen and Bieler, 1992 -- valid -- yellow-tentacled galeommatid
  Divariscintilla octotentaculata P. M. Mikkelsen and Bieler, 1992 -- valid -- eight-tentacle galeommatid
  Divariscintilla troglodytes P. M. Mikkelsen and Bieler, 1989 -- valid -- hole-dwelling galeommatid
  Divariscintilla yoyo P. M. Mikkelsen and Bieler, 1989 -- valid -- yoyo galeommatid
  Dolabrifera Gray, 1847 -- valid
  Dolabrifera dolabrifera (Rang, 1828) -- valid -- warty seacat
  Dolicholatirus Bellardi, 1884 -- valid
  Dolicholatirus cayohuesonicus (Sowerby, 1878) -- invalid -- Key West latirus
  Dolicholatirus pauli (McGinty, 1955) -- valid -- slender latirus
  Donacidae Fleming, 1828 -- valid
  Donax Linnaeus, 1758 -- valid
  Donax californicus Conrad, 1837 -- valid -- California beanclam
  Donax fossor Say, 1822 -- valid -- fossor coquina
  Donax gouldii Dall, 1921 -- valid -- Gould beanclam
  Donax variabilis Say, 1822 -- valid -- variable coquina
  Dondersia Hubrecht, 1888 -- valid
  Dondersiidae -- valid
  Dondice Er. Marcus, 1958 -- valid
  Dondice occidentalis (Engel, 1925) -- valid -- western dondice
  Dorididae Rafinesque, 1815 -- valid
  Doriopsilla Bergh, 1880 -- valid
  Doriopsilla albopunctata (J. G. Cooper, 1863) -- valid -- salted yellow doris, white-spot porostome
  Doriopsilla pharpa Er. Marcus, 1961 -- valid -- lemon drop
  Doris Linnaeus, 1758 -- valid
  Doris odonoghuei Steinberg, 1963 -- valid
  Doris verrucosa Linnaeus, 1758 -- valid -- sponge slug
  Dosinia Scopoli, 1777 -- valid
  Dosinia discus (Reeve, 1850) -- valid -- disk dosinia
  Dosinia elegans (Conrad, 1843) -- valid -- elegant dosinia
  Doto Oken, 1815 -- valid
  Doto amyra Er. Marcus, 1961 -- valid -- hammerhead doto
  Doto caramella Er. Marcus, 1957 -- valid
  Doto chica Ev. Marcus and Er. Marcus, 1960 -- valid
  Doto columbiana O'Donoghue, 1921 -- valid -- British Columbia doto
  Doto coronata (Gmelin, 1791) -- valid -- crown doto
  Doto divae Ev. Marcus and Er. Marcus, 1960 -- valid
  Doto doerga Ev. Marcus and Er. Marcus, 1963 -- valid
  Doto formosa A. E. Verrill, 1875 -- valid
  Doto kya Er. Marcus, 1961 -- valid -- dark doto
  Doto lancei Ev. Marcus and Er. Marcus, 1967 -- valid
  Doto pita Er. Marcus, 1955 -- valid
  Doto uva Er. Marcus, 1955 -- valid
  Dotoidae -- valid
  Dreissena Beneden, 1835 -- valid
  Dreissena bugensis Andrusov, 1897 -- valid -- quagga mussel
  Dreissena polymorpha (Pallas, 1771) -- valid -- zebra mussel
  Dreissenidae Gray, 1840 -- valid
  Drepanotrema Crosse and P. Fischer, 1880 -- valid
  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
  Drillia Gray, 1838 -- valid
  Drillia acurugata Dall, 1890 -- valid -- rough drillia
  Drillia albicoma Dall, 1889 -- valid
  Drillia canna Dall, 1889 -- valid
  Drillia cydia (Bartsch, 1943) -- valid
  Drillia wolfei Tippett, 1995 -- valid
  Drilliidae Olsson, 1964 -- valid
  Drilliola Locard, 1897 -- valid
  Drilliola loprestiana (Calcara, 1841) -- valid
  Dromus Simpson, 1900 -- valid
  Dromus dromas (Lea, 1834) -- valid -- dromedary pearly mussel
  Dryachloa F. G. Thompson and H. G. Lee, 1980 -- valid
  Dryachloa dauca F. G. Thompson and H. G. Lee, 1980 -- valid -- carrot glass
  Drymaeus Albers, 1850 -- valid
  Drymaeus dominicus (Reeve, 1850) -- valid -- master treesnail
  Drymaeus dormani (W. G. Binney, 1857) -- valid -- manatee treesnail
  Drymaeus multilineatus (Say, 1825) -- valid -- lined treesnail
  Ebalidae -- valid
  Elachisima Dall, 1918 -- invalid
  Elachisima floridana (Rehder, 1943) -- invalid
  Elachisina Dall, 1918 -- valid
  Elachisina floridana (Rehder, 1943) -- valid
  Elachisina globuloides (Waren, 1972) -- valid
  Elachisina grippi Dall, 1918 -- valid
  Elachisinidae -- valid
  Elaeocyma Dall, 1918 -- valid
  Elaeocyma empyrosia (Dall, 1899) -- valid
  Elimia H. Adams and A. Adams, 1854 -- valid
  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 catenaria (Say, 1822) -- valid -- Gravel Elimia
  Elimia catenoides (Lea, 1842) -- valid -- Lirate 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 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 gibbera (Goodrich, 1922) -- valid -- Shouldered 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 lachryma (Reeve, 1861) -- valid -- Teardrop Elimia
  Elimia laeta (Jay, 1839) -- valid -- Ribbed Elimia
  Elimia laqueata (Say, 1829) -- valid -- Panel Elimia
  Elimia livescens (Menke, 1830) -- valid -- Liver Elimia
  Elimia macglameriana (Goodrich, 1936) -- valid -- Wrinkled 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 ornata (Lea, 1868) -- valid -- Ornate Elimia
  Elimia paupercula (Lea, 1862) -- valid -- Sooty Elimia
  Elimia perstriata (Lea, 1852) -- valid -- Engraved Elimia
  Elimia pilsbryi (Goodrich, 1927) -- valid -- Rough-lined Elimia
  Elimia plicatastriata (Wetherby, 1876) -- valid -- 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 Rafinesque, 1820 -- valid
  Ellipsaria lineolata (Rafinesque, 1820) -- valid -- butterfly
  Elliptio Rafinesque, 1819 -- valid
  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 complanata (Lightfoot, 1786) -- valid -- eastern elliptio
  Elliptio congaraea (Lea, 1831) -- valid -- Carolina slabshell
  Elliptio crassidens (Lamarck, 1819) -- valid -- elephant-ear, elephantear
  Elliptio cylindracea Frierson, 1927 -- valid
  Elliptio dariensis (Lea, 1842) -- valid -- Georgia elephantear
  Elliptio dilatata (Rafinesque, 1820) -- valid -- spike
  Elliptio downiei (Lea, 1858) -- valid -- Satilla elephantear
  Elliptio errans (Lea, 1856) -- valid -- oval Elliptio
  Elliptio fisheriana (Lea, 1838) -- valid -- northern lance
  Elliptio folliculata (Lea, 1838) -- valid -- pod lance
  Elliptio fraterna (Lea, 1852) -- valid -- brother spike
  Elliptio hepatica (Lea, 1859) -- valid -- brown elliptio
  Elliptio hopetonensis (Lea, 1838) -- valid -- Altamaha slabshell
  Elliptio icterina (Conrad, 1834) -- valid -- variable spike
  Elliptio jayensis (Lea, 1838) -- valid -- flat spike
  Elliptio judithae Clarke, 1986 -- valid -- plicate spike
  Elliptio lanceolata (Lea, 1828) -- valid -- yellow lance
  Elliptio lugubris (Lea, 1838) -- invalid -- sad elliptio
  Elliptio macmichaeli Clench & Turner, 1956 -- invalid -- fluted elephant-ear
  Elliptio marsupiobesa Fuller, 1972 -- valid -- Cape Fear spike
  Elliptio mcmichaeli Clench & Turner, 1956 -- valid -- fluted elephantear
  Elliptio monroensis (Lea, 1843) -- valid -- St. Johns elephantear
  Elliptio nigella (Lea, 1852) -- valid -- winged spike
  Elliptio producta (Conrad, 1836) -- valid -- Atlantic spike
  Elliptio raveneli (Conrad, 1834) -- valid -- 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 -- valid -- Tar River spinymussel, Tar spinymussel
  Elliptio waccamawensis (Lea, 1863) -- valid -- Waccamaw spike
  Elliptio waltoni (B.H. Wright, 1888) -- invalid -- Florida lance
  Elliptoideus Frierson, 1927 -- valid
  Elliptoideus sloatianus (Lea, 1840) -- valid -- purple bankclimber
  Ellobiidae L. Pfeiffer, 1854 -- valid
  Ellobium Roding, 1798 -- valid
  Ellobium dominicense (Ferussac, 1821) -- valid -- white melampus
  Elysia canguzua Er. Marcus, 1955 -- valid
  Elysia catulus (Gould, 1870) -- valid
  Elysia chlorotica Gould, 1870 -- valid -- eastern emerald elysia, emerald elysia
  Elysia cornigera Nuttall, 1989 -- valid
  Elysia crispata Mørch, 1863 -- valid -- lettuce slug
  Elysia evelinae Er. Marcus, 1957 -- valid
  Elysia hedgpethi Er. Marcus, 1961 -- valid
  Elysia ornata (Swainson, 1840) -- valid -- ornate elysia
  Elysia papillosa A. E. Verrill, 1901 -- valid -- papillose elysia
  Elysia patina Ev. Marcus, 1980 -- valid
  Elysia serca Er. Marcus, 1955 -- valid -- caribbean seagrass elysia, seagrass elysia
  Elysia subornata A. E. Verrill, 1901 -- valid
  Elysia tuca Ev. Marcus and Er. Marcus, 1967 -- valid
  Elysiidae -- valid
  Emarcusia Roller, 1972 -- valid
  Emarcusia morroensis Roller, 1972 -- valid -- orange-blotch aeolis
  Emarginula Lamarck, 1801 -- valid
  Emarginula dentigera Heilprin, 1889 -- valid -- toothed emarginula
  Emarginula nordica Perez Farfante, 1947 -- valid -- northern 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
  Embletonia fuscata Gould, 1870 -- invalid
  Empleconia Dall, 1908 -- valid
  Empleconia vaginata (Dall, 1891) -- valid -- vaginate limops
  Enaeta H. Adams and A. Adams, 1853 -- valid
  Enaeta cylleniformis (G. B. Sowerby I, 1844) -- valid -- sand lyria
  Engina Gray, 1839 -- valid
  Engina corinnae Crovo, 1971 -- valid
  Engina strongi Pilsbry and Lowe, 1932 -- valid
  Engina turbinella (Kiener, 1835) -- valid -- white-spot engina
  Ennucula Iredale, 1931 -- valid
  Ennucula linki (Dall, 1916) -- valid -- Link nutclam
  Ennucula tenuis (Montagu, 1808) -- valid -- smooth nutclam
  Ensis Schumacher, 1817 -- valid
  Ensis directus Conrad, 1843 -- valid -- Atlantic jackknife, atlantic jackknife clam
  Ensis minor Dall, 1900 -- valid -- minor jackknife, minor jackknife clam
  Ensis myrae S. S. Berry, 1953 -- valid -- California jackknife, california jackknife clam
  Ensitellops Olsson and Harbison, 1953 -- valid
  Ensitellops protexta (Conrad, 1841) -- valid -- textured sportella
  Entemnotrochus Fischer, 1885 -- valid
  Entemnotrochus adansonianus (Crosse and P. Fischer, 1861) -- valid
  Enteroxenos Bonnevie, 1902 -- valid
  Enteroxenos parastichopoli (Tikasingh, 1961) -- valid
  Entocolax Voigt, 1888 -- valid
  Entocolax ludwigii Voigt, 1888 -- valid
  Entoconcha J. Muller, 1852 -- valid
  Entoconchidae Gill, 1871 -- invalid
  Entodesma Phillips, 1845 -- valid
  Entodesma beana (d'Orbigny, 1842) -- valid -- pearly entodesma
  Entodesma navicula (A. Adams and Reeve, 1850) -- valid -- rock entodesma
  Entodesma pictum (G. B. Sowerby I, 1834) -- valid -- painted entodesma, thin entodesma
  Entovalva Voeltzkow, 1890 -- valid
  Entovalva perrieri (Malard, 1903) -- valid -- leptosynapta montacutid, perrier montacutid
  Eobania P. Hesse, 1913 -- valid
  Eobania vermiculata (Muller, 1774) -- valid -- chocolate-band snail
  Epilucina Dall, 1901 -- valid
  Epilucina californica (Conrad, 1837) -- valid -- California lucine
  Epioblasma Rafinesque, 1831 -- valid
  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 (Lea, 1857) -- valid -- yellow blossom
  Epioblasma florentina curtisi (Utterback, 1915) -- invalid -- Curtis' pearly mussel
  Epioblasma florentina curtisii (Utterback, 1915) -- invalid -- Curtis' pearly mussel
  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 (Rafinesque, 1820) -- valid -- catspaw, purple cat's paw pearly mussel
  Epioblasma obliquata obliquata (Rafinesque, 1820) -- invalid -- catspaw, purple cat's paw pearly mussel
  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 (Rafinesque, 1820) -- valid -- tubercled blossom
  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
  Episcynia Morch, 1875 -- valid
  Episcynia devexa Keen, 1946 -- valid
  Episcynia inornata (d'Orbigny, 1842) -- valid -- fringed vitrinella
  Episiphon didymus (Watson, 1879) -- valid -- ovate tuskshell
  Episiphon sowerbyi (Guilding, 1834) -- valid -- annulate tuskshell
  Epitoniidae S. S. Berry, 1910 -- valid
  Epitonium Roding, 1798 -- valid
  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 blainei Clench and Turner, 1953 -- valid
  Epitonium candeanum (d'Orbigny, 1842) -- valid
  Epitonium celesti (Aradas, 1854) -- valid
  Epitonium championi Clench and Turner, 1952 -- valid
  Epitonium dallianum (A. E. Verrill and S. Smith, 1880) -- valid
  Epitonium denticulatum (G. B. Sowerby II, 1844) -- valid -- tooth-rib wentletrap
  Epitonium foliaceicosta (d'Orbigny, 1842) -- valid -- wrinkle-rib wentletrap
  Epitonium fractum Dall, 1927 -- valid -- humble wentletrap
  Epitonium frielei (Dall, 1889) -- valid
  Epitonium greenlandicum (G. Perry, 1811) -- valid -- Greenland wentletrap
  Epitonium humphreysii (Kiener, 1838) -- valid
  Epitonium krebsii (Morch, 1874) -- valid
  Epitonium lamellosum (Lamarck, 1822) -- valid -- lamellose wentletrap
  Epitonium matthewsae Clench and Turner, 1952 -- valid
  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 phymanthi Robertson, 1994 -- valid
  Epitonium rupicola (Kurtz, 1860) -- valid -- brown-band wentletrap
  Epitonium sericifilum (Dall, 1889) -- valid -- silky wentletrap
  Epitonium striatissimum (di Monterosato, 1878) -- valid -- frosted wentletrap
  Epitonium tollini Bartsch, 1938 -- valid
  Epitonium unifasciatum (G. B. Sowerby II, 1844) -- valid -- one-band wentletrap
  Eratoidea Weinkauff, 1879 -- valid
  Eratoidea hematita (Kiener, 1834) -- valid -- carmine marginella
  Ercolania Trinchese, 1872 -- valid
  Ercolania boodleae (Baba, 1938) -- valid
  Ercolania coerulea Trinchese, 1893 -- valid -- blue stiliger
  Ercolania funerea (A. Costa, 1867) -- valid
  Ercolania fuscata (Gould, 1870) -- valid -- dusky stiliger
  Eremarionta Pilsbry, 1913 -- valid
  Eremarionta brunnea (Willett, 1935) -- valid -- Chuckwalla Spring desertsnail
  Eremarionta immaculata (Willett, 1937) -- valid -- white desertsnail
  Eremarionta millepalmarum (S. S. Berry, 1930) -- valid -- Thousand Palms desertsnail
  Eremarionta morongoana (S. S. Berry, 1929) -- valid -- Morongo desertsnail
  Eremarionta newcombi Pilsbry and Ferriss, 1923 -- valid
  Eremarionta orocopia (Willett, 1939) -- valid -- Orocopia desertsnail
  Eremarionta rowelli (Newcomb, 1865) -- valid -- eastern desertsnail
  Eremariontoides Miller, 1981 -- valid
  Eremariontoides argus (Edson, 1912) -- valid -- Argus desertsnail
  Erginus Jeffreys, 1877 -- valid
  Erginus apicinus (Dall, 1879) -- valid -- cap limpet
  Erginus moskalevi (Golikov and Kussakin, 1972) -- valid
  Erginus puniceus Lindberg, 1988 -- valid
  Erginus rubellus (Fabricius, 1780) -- valid -- reddish limpet
  Erginus sybariticus (Dall, 1871) -- valid -- lush limpet
  Erosaria Troschel, 1863 -- valid
  Erosaria acicularis (Gmelin, 1791) -- valid -- Atlantic yellow cowrie
  Ersilia di Monterosato, 1872 -- valid
  Ersilia stancyki Waren, 1980 -- valid -- brittlestar snail, eastern brittlestar snail
  Ervilia Turton, 1822 -- valid
  Ervilia concentrica (Holmes, 1860) -- valid -- concentric ervilia
  Ervilia nitens (Montagu, 1808) -- valid -- shining ervilia
  Ervilia subcancellata E. A. Smith, 1885 -- valid -- subcancellate ervilia
  Erycina Lamarck, 1805 -- valid
  Erycina emmonsi Dall, 1899 -- valid -- emmons erycina, rectangular erycina
  Erycina linella Dall, 1899 -- valid -- lined erycina
  Erycina periscopiana Dall, 1899 -- valid -- periscope erycina
  Eubela Dall, 1889 -- valid
  Eubela limacina (Dall, 1881) -- valid
  Eubela mcgintyi Schwengel, 1943 -- valid
  Eubranchidae Odhner, 1934 -- valid
  Eubranchus Forbes, 1838 -- valid
  Eubranchus coniclus (Er. Marcus, 1958) -- valid
  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 pallidus (Alder and Hancock, 1842) -- valid
  Eubranchus rustyus (Er. Marcus, 1961) -- valid -- rustya aeolis
  Eubranchus sanjuanensis Roller, 1972 -- valid
  Eubranchus steinbecki Behrens, 1987 -- valid
  Eubranchus tricolor Forbes, 1838 -- valid -- painted balloon aeolis
  Euchelus Philippi, 1847 -- valid
  Euchelus guttarosea Dall, 1889 -- valid -- red-spot topsnail
  Euchemotrema Archer, 1939 -- valid
  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 Reinhardt, 1883 -- valid
  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 Iredale, 1924 -- valid
  Eucrassatella fluctuata (Carpenter, 1864) -- valid -- wavy crassatella
  Eucrassatella speciosa (A. Adams, 1852) -- valid -- beautiful crassatella
  Eudolium Dall, 1889 -- valid
  Eudolium bairdii (A. E. Verrill and S. Smith, 1881) -- valid
  Eudolium crosseanum (di Monterosato, 1869) -- valid -- straw tun
  Euglandina P. Fischer and Crosse, 1870 -- valid
  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 Risso, 1826 -- valid
  Eulima alaskensis (Bartsch, 1917) -- valid -- Alaska eulima
  Eulima almo (Bartsch, 1917) -- valid
  Eulima auricincta (Abbott, 1958) -- valid -- gold-stripe eulima
  Eulima bifasciata D'Orbigny, 1842 -- valid -- two-band eulima
  Eulima fulvocincta C. B. Adams, 1850 -- valid -- brown-varice eulima
  Eulima patula Dall and Simpson, 1901 -- valid -- largemouth eulima
  Eulima raymondi Rivers, 1904 -- valid -- California eulima
  Eulimastoma Bartsch, 1904 -- valid
  Eulimastoma engonium (Bush, 1885) -- valid
  Eulimastoma teres (Bush, 1885) -- valid
  Eulimastoma weberi (Morrison, 1965) -- valid
  Eulimella Gray, 1847 -- valid
  Eulimella polita (A. E. Verrill, 1872) -- valid
  Eulimella smithii (A. E. Verrill, 1880) -- valid
  Eulimidae -- valid
  Eulimostraca Bartsch, 1917 -- valid
  Eulimostraca subcarinata (d'Orbigny, 1842) -- valid -- brown-line eulima
  Eulithidium Pilsbry, 1898 -- valid
  Eulithidium affine (C. B. Adams, 1850) -- valid -- checkered pheasant
  Eulithidium affine affine (C. B. Adams, 1850) -- valid -- checkered pheasant
  Eulithidium affine cruentum (Robertson, 1958) -- valid -- stained pheasant
  Eulithidium bellum (M. Smith, 1937) -- valid -- shouldered pheasant
  Eulithidium comptum (Gould, 1855) -- valid -- banded pheasant
  Eulithidium pterocladicum (Robertson, 1958) -- valid -- rhodophyte pheasant
  Eulithidium pulloide (Carpenter, 1864) -- valid -- sullied pheasant
  Eulithidium rubrilineatum (Strong, 1928) -- valid -- red-line pheasant
  Eulithidium substriatum (Carpenter, 1864) -- valid -- low-line pheasant
  Eulithidium thalassicola (Robertson, 1958) -- valid -- turtlegrass pheasant
  Eumetula Thiele, 1912 -- valid
  Eumetula arctica (Morch, 1857) -- valid
  Eupera Bourguignat, 1854 -- valid
  Eupera cubensis (Prime, 1865) -- valid -- mottled fingernailclam
  Eupleura H. Adams and A. Adams, 1853 -- valid
  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 lewisii (Gould, 1847) -- valid
  Euspira nana (Møller, 1842) -- valid -- tiny moonsnail
  Euspira pallida (Broderip and G. B. Sowerby I, 1829) -- valid -- pale moonsnail
  Euspira tenuis (Récluz, 1850) -- valid -- thin moonsnail
  Euspira triseriata (Say, 1826) -- valid -- spotted moonsnail
  Euvola Dall, 1898 -- valid
  Euvola diegensis (Dall, 1898) -- valid -- San Diego scallop
  Euvola raveneli (Dall, 1898) -- valid -- round-rib scallop
  Euvola vogdesi (R. Arnold, 1906) -- valid -- concave scallop
  Euvola ziczac (Linnaeus, 1758) -- valid -- zigzag scallop
  Evalea A. Adams, 1860 -- valid
  Evalea amchitkana (Dall and Bartsch, 1909) -- valid
  Exilioidea Grant and Gale, 1931 -- valid
  Exilioidea kelseyi (Dall, 1908) -- valid
  Exilioidea rectirostris (Carpenter, 1864) -- valid
  Fabella Conrad, 1863 -- valid
  Fabella pilsbryi (Dall, 1899) -- valid -- oval sportella
  Facelina Alder and Hancock, 1855 -- valid
  Facelina bostoniensis (Couthouy, 1838) -- valid -- Boston facelina
  Facelina stearnsi Cockerell, 1901 -- valid -- scarlet-tip aeolis
  Facelinidae Bergh, 1889 -- valid
  Falcidens Salvini-Plawen, 1968 -- valid
  Falcidens hartmanae (Schwabl, 1961) -- valid -- tailed glistenworm
  Falcidens longus Scheltema, 1997 -- valid -- slender glistenworm
  Falcidens macracanthus Scheltema, 1997 -- valid -- long-spiculed glistenworm
  Falsicingula Habe, 1958 -- valid
  Falsicingula aleutica (Dall, 1887) -- valid
  Falsicingulidae -- valid
  Fargoa Robertson, 1978 -- valid
  Fargoa bartschi (Winkley, 1909) -- valid
  Fargoa calesi (Bartsch, 1909) -- valid
  Fargoa dianthophila (H. W. Wells and M. J. Wells, 1961) -- valid -- serpulid odostome
  Fargoa dux (Dall and Bartsch, 1906) -- valid
  Fargoa gibbosa (Bush, 1909) -- valid
  Fasciolaria Lamarck, 1799 -- valid
  Fasciolaria bullisi Lyons, 1972 -- valid -- yellow tulip
  Fasciolaria hunteria (G. Perry, 1811) -- invalid
  Fasciolaria lilium G. Fischer, 1807 -- valid -- banded tulip
  Fasciolaria lilium branhamae Rehder and Abbott, 1951 -- valid -- banded tulip
  Fasciolaria lilium bullisi Lyons, 1972 -- invalid -- yellow tulip
  Fasciolaria lilium hunteria (G. Perry, 1811) -- valid -- banded tulip
  Fasciolaria lilium lilium G. Fischer, 1807 -- valid -- banded tulip
  Fasciolaria lilium tortugana Hollister, 1957 -- valid -- banded tulip
  Fasciolaria tulipa (Linnaeus, 1758) -- valid -- true tulip
  Fasciolariidae Gray, 1853 -- valid
  Favartia Jousseaume, 1880 -- valid
  Favartia alveata (Kiener, 1842) -- valid -- frilly dwarf triton
  Favartia cellulosa (Conrad, 1846) -- valid -- pitted murex
  Favartia lindae Petuch, 1987 -- valid
  Favartia minirosea (Abbott, 1954) -- valid -- rosy drill
  Favartia pacei Petuch, 1988 -- valid
  Favartia richardbinghami (Petuch, 1987) -- valid
  Favorinus M. E. Gray, 1850 -- valid
  Favorinus auritulus Er. Marcus, 1955 -- valid
  Fedikovella Moskalev, 1976 -- valid
  Fedikovella beanii (Dall, 1882) -- valid
  Ferrissia Walker, 1903 -- valid
  Ferrissia fragilis (Tryon, 1863) -- invalid -- Fragile Ancylid
  Ferrissia hendersoni (Walker, 1908) -- invalid -- blackwater ancylid
  Ferrissia mcneili Walker, 1925 -- invalid -- hood ancylid
  Ferrissia parallelus (Haldeman, 1841) -- invalid -- Oblong Ancylid
  Ferrissia rivularis (Say, 1817) -- valid -- Creeping Ancylid
  Ferrissia walkeri (Pilsbry and Ferriss, 1907) -- invalid -- cloche ancylid
  Ferrussaciidae -- valid
  Ficidae Conrad, 1867 -- valid
  Ficus Röding, 1798 -- valid -- figsnails
  Ficus communis Roding, 1798 -- valid -- Atlantic figsnail
  Finella A. Adams, 1860 -- valid
  Finella adamsi (Dall, 1889) -- valid
  Finella barbarensis (Bartsch, 1911) -- valid -- Santa Barbara cerith
  Finella californica (Dall and Bartsch, 1901) -- valid -- California cerith
  Finella dubia (d'Orbigny, 1842) -- valid
  Finella hamlini (Bartsch, 1911) -- valid
  Finella io (Bartsch, 1911) -- valid
  Finella phanea (Bartsch, 1911) -- valid
  Finella tenuisculpta (Carpenter, 1864) -- valid -- fine-sculpted cerith
  Fiona Alder and Hancock, 1851 -- valid
  Fiona pinnata (Eschscholtz, 1831) -- valid -- fiona
  Fionidae Gray, 1857 -- valid
  Firoloida Lesueur, 1817 -- valid
  Firoloida demarestia Lesueur, 1817 -- valid
  Fisherola Hannibal, 1912 -- valid
  Fisherola nuttalli (Haldeman, 1841) -- valid -- Shortface Lanx
  Fissidentalium floridense (J. B. Henderson, 1920) -- valid -- yellow tuskshell
  Fissurella Bruguiere, 1789 -- valid
  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
  Fissurellidae Fleming, 1822 -- valid
  Fissurellidea D'Orbigny, 1841 -- valid
  Fissurellidea bimaculata Dall, 1871 -- valid -- two-spot keyhole limpet
  Flabellina Voigt, 1834 -- valid
  Flabellina cooperi (Cockerell, 1901) -- valid -- blue-patch aeolis
  Flabellina engeli Ev. Marcus and Er. Marcus, 1968 -- valid
  Flabellina gracilis (Alder and Hancock, 1844) -- valid
  Flabellina iodinea (J. G. Cooper, 1863) -- valid -- purple aeolis, Spanish shawl
  Flabellina nobilis (A. E. Verrill, 1880) -- valid
  Flabellina pellucida (Alder and Hancock, 1843) -- valid -- pellucid aeolis
  Flabellina pricei (MacFarland, 1966) -- valid -- smooth-tooth aeolis
  Flabellina salmonacea (Couthouy, 1838) -- valid -- salmon aeolis
  Flabellina subrosacea (Eschscholtz, 1831) -- valid
  Flabellina trilineata (O'Donoghue, 1921) -- valid -- threeline aeolis
  Flabellina trophina (Bergh, 1894) -- valid -- predaceous aeolis
  Flabellina verrucosa (M. Sars, 1829) -- valid -- red-finger aeolis
  Flabellinidae Dall and Simpson, 1901 -- valid
  Floridiscrobs Pilsbry and McGinty, 1949 -- valid
  Floridiscrobs dysbatus (Pilsbry and McGinty, 1949) -- valid
  Fluminicola Stimpson, 1865 -- valid
  Fluminicola coloradoensis Morrison, 1940 -- valid -- Green River Pebblesnail
  Fluminicola dalli (Call, 1884) -- valid -- Pyramid Lake Pebblesnail
  Fluminicola fuscus (Haldeman, 1847) -- valid -- Ashy Pebblesnail
  Fluminicola minutissimus Pilsbry, 1907 -- valid -- Pixie Pebblesnail
  Fluminicola modoci Hannibal, 1912 -- valid -- Modoc 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
  Folinia Crosse, 1868 -- valid
  Folinia bermudezi (Aguayo and Rehder, 1936) -- valid
  Fontigens Pilsbry, 1933 -- valid
  Fontigens aldrichi (Call and Beecher, 1886) -- valid -- Hoosier Amnicola, Hoosier Springsnail
  Fontigens antroecetes (Hubricht, 1972) -- valid -- Missouri Cavesnail
  Fontigens binneyana (Hannibal, 1912) -- invalid
  Fontigens bottimeri (Walker, 1925) -- valid -- Potomac Springsnail
  Fontigens cryptica Hubricht, 1963 -- valid -- Hidden Springsnail
  Fontigens morrisoni Hershler, Holsinger and Hubricht, 1990 -- valid -- Morrison's Springsnail
  Fontigens nickliniana (Lea, 1838) -- valid -- Watercress Snail
  Fontigens orolibas Hubricht, 1957 -- valid -- Blue Ridge Springsnail
  Fontigens proserpina (Hubricht, 1940) -- valid -- Proserpine Cavesnail
  Fontigens tartarea Hubricht, 1963 -- valid -- Organ Cavesnail
  Fontigens turritella Hubricht, 1976 -- valid -- Greenbrier Cavesnail
  Fontigens weberi Pilsbry, 1950 -- invalid
  Forreria Jousseaume, 1880 -- valid
  Forreria belcheri (Hinds, 1843) -- valid
  Fossaria Westerlund, 1885 -- invalid
  Fossaria alberta (F. C. Baker, 1919) -- invalid
  Fossaria bulimoides (Lea, 1841) -- invalid
  Fossaria cockerelli (Pilsbry and Ferriss, 1906) -- 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 exigua (Lea, 1841) -- invalid
  Fossaria galbana (Say, 1825) -- invalid -- boreal fossaria
  Fossaria hendersoni (F. C. Baker, 1909) -- invalid
  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 peninsulae (Walker, 1908) -- invalid
  Fossaria perplexa F. C. Baker and J. Henderson, 1929 -- invalid
  Fossaria perpolita (Dall, 1905) -- invalid -- glossy fossaria
  Fossaria rustica (Lea, 1841) -- invalid
  Fossaria sonomaensis (Hemphill in Pilsbry and Ferriss, 1906) -- invalid -- Sonoma fossaria
  Fossaria tazewelliana (Wolf, 1870) -- invalid -- Tazwell fossaria
  Fossaria techella (Haldeman, 1867) -- invalid
  Fossaria truncatula (Muller, 1774) -- invalid -- attenuate fossaria
  Fossaria vancouverensis (F. C. Baker, 1939) -- invalid
  Fossarus Philippi, 1841 -- valid
  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
  Fossarus orbignyi P. Fischer, 1864 -- valid
  Frigidoalvania Waren, 1974 -- valid
  Frigidoalvania brychia (A. E. Verrill, 1884) -- valid
  Frigidoalvania cruenta (Odhner, 1915) -- valid
  Frigidoalvania janmayeni (Friele, 1878) -- valid -- Jan Mayen alvania
  Frigidoalvania pelagica (Stimpson, 1851) -- valid -- carinate alvania
  Fumonelix Emberton, 1991 -- valid
  Fumonelix archeri (Pilsbry, 1940) -- valid -- Ocoee covert
  Fumonelix christyi (Bland, 1860) -- valid -- glossy covert
  Fumonelix jonesiana (Archer, 1938) -- valid -- big-tooth covert
  Fumonelix orestes (Hubricht, 1975) -- valid -- engraved covert
  Fumonelix wetherbyi (Bland, 1873) -- valid -- clifty covert
  Fumonelix wheatleyi (Bland, 1860) -- valid -- cinnamon covert
  Fusconaia Simpson, 1900 -- valid
  Fusconaia askewi (Marsh, 1896) -- valid -- Texas pigtoe
  Fusconaia barnesiana (Lea, 1838) -- invalid -- Tennessee pigtoe
  Fusconaia cerina (Conrad, 1838) -- valid -- southern pigtoe
  Fusconaia cor (Conrad, 1834) -- valid -- shiny pigtoe
  Fusconaia cuneolus (Lea, 1840) -- valid -- fine-rayed pigtoe
  Fusconaia ebena (Lea, 1831) -- valid -- 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 Rafinesque, 1815 -- valid
  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 spindle, modest spinkle
  Fusinus couei (Petit de la Saussaye, 1853) -- valid -- Yucatan spindle
  Fusinus eucosmius (Dall, 1889) -- valid -- apricot spindle
  Fusinus harfordii (Stearns, 1871) -- valid
  Fusinus helenae Bartsch, 1939 -- valid -- brown spindle
  Fusinus kobelti (Dall, 1877) -- valid
  Fusinus luteopictus (Dall, 1877) -- valid -- painted spindle
  Fusinus monksae Dall, 1915 -- valid
  Fusinus stegeri Lyons, 1978 -- valid -- ornamented spindle
  Fusitriton Cossmann, 1903 -- valid
  Fusitriton oregonensis (Redfield, 1848) -- valid -- Oregon triton
  Fustiaria stenoschizum (Pilsbry and Sharp, 1897) -- valid -- narrow-slit tuskshell
  Fustiariidae Steiner, 1991 -- valid
  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
  Gadilida Starobogatov, 1974 -- valid
  Gadilidae Stoliczka, 1868 -- valid
  Gadilinidae Chistikov, 1975 -- valid
  Galeommatidae Gray, 1840 -- valid
  Gari Schumacher, 1817 -- valid
  Gari californica (Conrad, 1849) -- valid -- California sunsetclam
  Gari fucata (Hinds, 1845) -- valid -- painted sunsetclam
  Gastrochaena Spengler, 1783 -- valid
  Gastrochaena hians (Gmelin, 1791) -- valid -- Atlantic gastrochaenid, atlantic rocellaria
  Gastrochaena ovata G. B. Sowerby I, 1834 -- valid -- ovate gastrochaenid, ovate rocellaria
  Gastrochaena stimpsoni Tryon, 1861 -- valid -- Stimpson gastrochaenid, stimpson rocellaria
  Gastrochaenidae Gray, 1840 -- valid
  Gastrocopta Wollaston, 1878 -- valid
  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 servilis (Gould, 1843) -- valid -- wandering snag
  Gastrocopta similis (Sterki, 1909) -- valid -- Great Lakes snaggletooth
  Gastrocopta sterkiana Pilsbry, 1917 -- valid
  Gastrocopta tappaniana (C. B. Adams, 1842) -- valid -- white snaggletooth
  Gastrodonta Albers, 1850 -- valid
  Gastrodonta fonticula Wurtz, 1948 -- valid -- Appalachia bellytooth
  Gastrodonta interna (Say, 1822) -- valid -- brown bellytooth
  Gastropoda Cuvier, 1797 -- valid -- caracol, caramujo, escargots, gastéropodes, gastropods, lesma, limaces, slugs, snails
  Gastropteridae Swainson, 1840 -- valid
  Gastropteron Kosse, 1813 -- valid
  Gastropteron chacmol Gosliner, 1989 -- valid
  Gastropteron pacificum Bergh, 1893 -- valid -- Pacific batwing seaslug
  Gastropteron vespertilium Gosliner and Armes, 1984 -- valid -- flapping dingbat
  Gaza Watson, 1879 -- valid
  Gaza superba (Dall, 1881) -- valid -- superb gaza
  Geitodoris Bergh, 1892 -- valid
  Geitodoris complanata (A. E. Verrill, 1880) -- valid
  Geitodoris heathi (MacFarland, 1905) -- valid -- gritty doris
  Geitodoris immunda Bergh, 1894 -- valid
  Geitodoris pusae (Er. Marcus, 1955) -- valid
  Gemma Deshayes, 1853 -- valid
  Gemma gemma (Totten, 1834) -- valid -- amethyst gemclam
  Gemmula Weinkauff, 1875 -- valid
  Gemmula periscelida (Dall, 1889) -- valid -- Atlantic gem-turris
  Genitoconia Salvini-Plawen, 1967 -- valid
  Genitoconia mariensis Scheltema, 1997 -- valid
  Gerdiella Olsson and Bayer, 1972 -- valid
  Gerdiella corbicula (Dall, 1908) -- valid -- basket nutmeg
  Geukensia Van de Poel, 1959 -- valid
  Geukensia demissa (Dillwyn, 1817) -- valid -- ribbed mussel, ribbed-mussel
  Geukensia granosissima (G. B. Sowerby III, 1914) -- valid -- southern ribbed-mussel
  Gibberula Swainson, 1840 -- valid
  Gibberula lavalleeana (d'Orbigny, 1842) -- valid -- snowflake marginella
  Gibberula subtrigona (Carpenter, 1864) -- valid -- triangular marginella
  Gillia Stimpson, 1865 -- valid
  Gillia altilis (Lea, 1841) -- valid -- Buffalo Pebblesnail
  Glans Megerle von Muhlfeld, 1811 -- valid
  Glans carpenteri (Lamy, 1922) -- valid -- Carpenter carditid
  Glans dominguensis (d'Orbigny, 1842) -- valid -- Santo Domingo carditid
  Glaucidae Menke, 1828 -- valid
  Glaucus Forster, 1777 -- valid
  Glaucus atlanticus Forster, 1777 -- valid -- blue glaucus
  Gleba Forskal, 1776 -- valid
  Gleba cordata Niebuhr, 1776 -- valid
  Glebula Conrad, 1853 -- valid
  Glebula rotundata (Lamarck, 1819) -- valid -- round pearlshell
  Gliabates Webb, 1959 -- valid
  Gliabates oregonius Webb, 1959 -- valid -- salamander slug
  Globivenus Coen, 1934 -- valid
  Globivenus callimorpha (Dall, 1902) -- valid -- lily venus
  Globivenus fordi (Yates, 1890) -- valid -- Ford venus
  Globivenus foresti (Fischer-Piette and Testud, 1967) -- valid
  Globivenus rigida (Dillwyn, 1817) -- valid -- rigid venus
  Globivenus rugatina (Heilprin, 1886) -- valid -- queen venus
  Glossocardia Stoliczka, 1870 -- valid
  Glossocardia agassizii (Dall, 1889) -- valid -- ox-heart clam
  Glossodoris Ehrenberg, 1831 -- valid
  Glossodoris sedna (Ev. Marcus and Er. Marcus, 1967) -- valid
  Glycymerididae Newton, 1922 -- valid
  Glycymeris E. M. da Costa, 1778 -- valid
  Glycymeris americana (DeFrance, 1829) -- valid -- giant american bittersweet, giant bittersweet
  Glycymeris decussata (Linnaeus, 1758) -- valid -- decussate bittersweet
  Glycymeris keenae Willett, 1944 -- valid -- commarginal 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 undata (Linnaeus, 1758) -- valid -- wavy bittersweet
  Glyphostoma Gabb, 1872 -- valid
  Glyphostoma adria Dall, 1919 -- valid
  Glyphostoma dentiferum Gabb, 1872 -- valid
  Glyphostoma elsae Bartsch, 1934 -- valid
  Glyphostoma gabbii Dall, 1889 -- valid
  Glyphostoma golfoyaquense Maury, 1917 -- valid
  Glyphostoma pilsbryi Schwengel, 1940 -- valid
  Glyphostomops Bartsch, 1934 -- valid
  Glyphostomops hendersoni (Bartsch, 1934) -- valid
  Glyphostomops oenoa (Bartsch, 1934) -- valid
  Glyphoturris Woodring, 1928 -- valid
  Glyphoturris diminuta (C. B. Adams, 1850) -- valid
  Glyphoturris eritima (Bush, 1885) -- valid
  Glyphoturris quadrata (Reeve, 1845) -- valid
  Glyphoturris rugirima (Dall, 1889) -- valid
  Glyphyalinia von Martens, 1892 -- valid
  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
  Glyptaesopus Pilsbry and Olsson, 1941 -- valid
  Glyptaesopus proctorae (M. Smith, 1936) -- valid
  Glyptostoma Bland and W. G. Binney, 1873 -- valid
  Glyptostoma gabrielense Pilsbry, 1938 -- valid -- San Gabriel chestnut
  Glyptostoma newberryanum (W. G. Binney, 1858) -- valid -- San Diego chestnut
  Godiva Macnae, 1954 -- valid
  Godiva rubrolineata Edmunds, 1964 -- valid
  Gonatus berryi Naef, 1923 -- valid -- Berry armhook squid
  Gonatus fabricii (Lichtenstein, 1818) -- valid -- boreoatlantic armhook squid
  Gonidea Conrad, 1857 -- valid
  Gonidea angulata (Lea, 1838) -- valid -- western ridged mussel
  Goniobasis cahawbensis Lea, 1841 -- invalid
  Goniodorididae H. and A. Adams, 1854 -- valid
  Gouldia C. B. Adams, 1847 -- valid
  Gouldia cerina (C. B. Adams, 1845) -- valid -- waxy gouldclam
  Granotoma Bartsch, 1941 -- valid
  Granotoma albrechti (Krause, 1885) -- valid
  Granotoma krausei (Dall, 1886) -- valid
  Granoturris Fargo, 1953 -- valid
  Granoturris presleyi Lyons, 1972 -- valid
  Granulina Jousseaume, 1888 -- valid
  Granulina hadria (Dall, 1889) -- valid
  Granulina margaritula (Carpenter, 1857) -- valid -- pear marginella, pear-shaped marginella
  Granulina ovuliformis (d'Orbigny, 1841) -- valid -- teardrop marginella
  Graphis Jeffreys, 1867 -- valid
  Graphis underwoodae Bartsch, 1947 -- valid
  Graptacme calamus (Dall, 1889) -- valid -- reed tuskshell
  Graptacme eborea (Conrad, 1846) -- valid -- ivory tuskshell
  Graptacme inversa (Deshayes, 1826) -- valid -- turned tuskshell
  Graptacme semipolita (Broderip and G. B. Sowerby I, 1829) -- valid -- half-smooth tuskshell
  Graptacme semistriolata (Guilding, 1834) -- valid -- scratched tuskshell
  Gregariella di Monterosato, 1884 -- valid
  Gregariella chenui (Recluz, 1842) -- valid -- Chenu mussel
  Gregariella coarctata (Carpenter, 1857) -- valid -- cancellate mussel
  Gregariella coralliophaga (Gmelin, 1791) -- valid -- coral-eating mussel
  Grippina Dall, 1912 -- valid
  Grippina californica Dall, 1912 -- valid -- California grippclam
  Gryphaeidae Vyalov, 1936 -- valid
  Guppya Morch, 1867 -- valid
  Guppya gundlachi (Pfeiffer, 1839) -- valid -- glossy granule
  Guppya miamiensis Pilsbry, 1903 -- valid
  Guppya sterkii (Dall, 1888) -- valid
  Gymnobela A. E. Verrill, 1884 -- valid
  Gymnobela agassizii (A. E. Verrill and S. Smith, 1880) -- valid
  Gymnomenia Odhner, 1919 -- valid
  Gymnomenia minuta Scheltema, 1997 -- valid
  Gymnomeniidae -- valid
  Gymnosomata Blainville, 1824 -- valid
  Gyraulus Agassiz, 1837 -- valid
  Gyraulus circumstriatus (Tryon, 1866) -- valid -- Disc Gyro
  Gyraulus crista (Linnaeus, 1758) -- valid -- Star 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 Shuttleworth, 1845 -- valid
  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
  Habevolutopsius attenuatus (Dall, 1874) -- valid -- elongate whelk
  Halicardia Dall, 1895 -- valid
  Halicardia flexuosa (A. E. Verrill and S. Smith, 1881) -- valid -- flexed verticord
  Haliotididae Rafinesque, 1815 -- invalid
  Haliotinella Souverbie, 1875 -- valid
  Haliotinella patinaria (Guppy, 1876) -- valid -- fingernail moonsnail
  Haliotis Linnaeus, 1758 -- valid -- abalone
  Haliotis assimilis Dall, 1878 -- invalid -- threaded abalone
  Haliotis corrugata W. Wood, 1828 -- valid -- abulón amarillo, pink abalone
  Haliotis cracherodii Leach, 1814 -- valid -- abulón negro, black abalone
  Haliotis fulgens Philippi, 1845 -- valid -- abulón azul, green abalone
  Haliotis kamtschatkana Jonas, 1845 -- valid -- pinto abalone
  Haliotis pourtalesii Dall, 1881 -- valid
  Haliotis rufescens Swainson, 1822 -- valid -- abulón rojo, red abalone
  Haliotis sorenseni Bartsch, 1940 -- valid -- white abalone
  Haliotis walallensis Stearns, 1899 -- valid -- flat abalone, northern green abalone
  Haliris Dall, 1886 -- valid
  Haliris aequacostata (Howard, 1950) -- valid -- even-ribbed verticord
  Haliris fischeriana (Dall, 1881) -- valid -- beaded verticord
  Halistrepta Dall, 1904 -- valid
  Halistrepta sulcata (Dall, 1904) -- valid -- sulcate spoonclam
  Halistylus Dall, 1890 -- valid
  Halistylus pupoideus (Carpenter, 1864) -- valid -- pupa halistyle
  Hallaxa Eliot, 1909 -- valid
  Hallaxa chani Gosliner and Williams, 1975 -- valid
  Haloceras Dall, 1889 -- valid
  Haloceras trichotropoides Waren and Bouchet, 1991 -- valid
  Haloceratidae -- valid
  Haloconcha Dall, 1886 -- valid
  Haloconcha minor Dall, 1919 -- valid -- lesser lacuna
  Haloconcha refleza (Dall, 1884) -- valid -- reflexed lacuna
  Halodakra Olsson, 1961 -- valid
  Halodakra salmonea (Carpenter, 1864) -- valid -- salmon bernard-clam, salmon bernardclam
  Halodakra subtrigona (Carpenter, 1857) -- valid -- subtrigonal bernard-clam, subtrigonal bernardclam
  Haminoea Turton and Kingston, 1830 -- valid
  Haminoea antillarum (d'Orbigny, 1841) -- valid -- Antilles glassy-bubble
  Haminoea callidegenita Gibson and Chia, 1989 -- valid
  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 taylorae Petuch, 1987 -- valid
  Haminoea vesicula (Gould, 1855) -- valid -- blister glassy-bubble
  Haminoea virescens (G. B. Sowerby II, 1833) -- valid -- green glassy-bubble
  Haminoeidae Pilsbry, 1895 -- valid
  Hancockia Gosse, 1877 -- valid
  Hancockia californica MacFarland, 1923 -- valid
  Hancockiidae MacFarland, 1923 -- valid
  Hanleya Gray, 1857 -- valid
  Hanleya hanleyi (Bean, 1844) -- valid -- eastern hanleya
  Hanleya nagelfar (Loven, 1842) -- valid
  Hanleyella Sirenko, 1973 -- valid
  Hanleyella asiatica Sirenko, 1973 -- valid
  Hanleyella oldroydi (Dall, 1919) -- valid
  Hanleyidae Bergenhayn, 1955 -- valid
  Haplocochlias Carpenter, 1864 -- valid
  Haplocochlias swifti Vanatta, 1913 -- valid
  Haplotrema Ancey, 1881 -- valid
  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-foot lancetooth, gray-footed 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-foot lancetooth, blue-footed lancetooth
  Haplotrema minimum (Ancey, 1888) -- valid -- California lancetooth
  Haplotrema mokelumnense Roth, 1990 -- valid -- Mokelumne lancetooth
  Haplotrema transfuga (Hemphill, 1892) -- valid -- striate lancetooth
  Haplotrema vancouverense (I. Lea, 1839) -- valid -- robust lancetooth
  Haplotrematidae -- valid
  Harpidae -- valid
  Hastula H. Adams and A. Adams, 1853 -- valid
  Hastula cinerea (Born, 1778) -- valid -- gray auger
  Hastula hastata (Gmelin, 1791) -- valid -- shiny auger
  Hastula maryleeae R. D. Burch, 1965 -- valid
  Hastula salleana (Deshayes, 1859) -- valid
  Haustellum Schumacher, 1817 -- valid
  Haustellum anniae (M. Smith, 1940) -- valid
  Haustellum bellegladeense (Vokes, 1963) -- valid -- Belleglade murex
  Haustellum cabritii (Bernardi, 1859) -- valid
  Haustellum rubidum (F. C. Baker, 1897) -- valid -- rose murex
  Haustellum tryoni (Hidalgo in Tryon, 1880) -- valid
  Hawaiia Gude, 1911 -- valid
  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 Pilsbry, 1914 -- invalid
  Hebetoncylus excentricus (Morelet, 1851) -- invalid -- Excentric Ancylid
  Hedylopsis Thiele, 1931 -- valid
  Hedylopsis riseri M. P. Morse, 1976 -- valid
  Heilprinia Grabau, 1904 -- valid
  Heilprinia lindae Petuch, 1987 -- valid
  Heilprinia timessa (Dall, 1889) -- valid -- turnip spindle
  Heleobops F. G. Thompson, 1968 -- valid
  Heleobops carrikeri Davis and McKee, 1989 -- valid
  Heleobops docimus F. G. Thompson, 1968 -- valid -- Oolite Hydrobe
  Heliacus D'Orbigny, 1842 -- valid
  Heliacus alleryi (Seguenza, 1876) -- invalid
  Heliacus architae (O. G. Costa, 1841) -- invalid -- noduled sundial
  Heliacus bisulcatus (d'Orbigny, 1842) -- valid -- beaded sundial
  Heliacus borealis (A. E. Verrill and S. Smith, 1880) -- invalid -- boreal sundial
  Heliacus cylindricus (Gmelin, 1791) -- valid -- Atlantic cylinder sundial
  Heliacus infundibuliformis (Gmelin, 1791) -- valid -- channeled sundial
  Heliacus infundibuliformis perrieri (Rochebrune, 1881) -- valid -- channeled sundial
  Heliacus perrieri (Rochebrune, 1881) -- invalid -- channeled sundial
  Helicarionidae -- valid
  Helicella Ferussac, 1821 -- valid
  Helicella obvia (Menke, 1828) -- valid -- heath helicellid
  Helicidae -- valid
  Helicina Lamarck, 1799 -- valid
  Helicina clappi Pilsbry, 1909 -- valid -- rainbow drop
  Helicinidae Latreille, 1825 -- valid
  Helicodiscidae -- valid
  Helicodiscus E. S. Morse, 1864 -- valid
  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 Swainson, 1840 -- valid
  Helisoma anceps (Menke, 1830) -- valid -- Two-ridge Ramshorn
  Helisoma newberryi (Lea, 1858) -- valid -- Great Basin Ramshorn
  Helix Linnaeus, 1758 -- valid
  Helix aperta Born, 1778 -- valid -- green gardensnail
  Helix aspersa Muller, 1774 -- valid -- brown gardensnail
  Helix pomatia Linnaeus, 1758 -- valid -- escargot
  Helminthoglypta Ancey, 1887 -- valid
  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 avus (Bartsch, 1916) -- valid -- badger 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 Joaquin shoulderband, san juaquin shoulderband
  Helminthoglypta caruthersi Willett, 1934 -- valid -- Morris Canyon shoulderband
  Helminthoglypta coelata (Bartsch, 1916) -- valid -- mesa shoulderband
  Helminthoglypta concolor Roth and Hochberg, 1988 -- valid -- whitefir 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 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 -- San Lorenzo shoulderband, santa cruz shoulderband
  Helminthoglypta expansilabris (Pilsbry, 1898) -- valid -- Mendocino shoulderband
  Helminthoglypta fairbanksi Reeder and W. B. Miller, 1986 -- valid -- DeLuz 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 mailliardi Pilsbry, 1927 -- valid -- Del Norte shoulderband
  Helminthoglypta micrometalleoides W. B. Miller, 1970 -- valid -- mimic shoulderband
  Helminthoglypta milleri Reeder, 1986 -- valid -- peak shoulderband
  Helminthoglypta mohaveana S. S. Berry, 1927 -- valid -- Victorville shoulderband
  Helminthoglypta montezuma Reeder and W. B. Miller, 1986 -- valid -- Montezuma 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 phlyctaena (Bartsch, 1916) -- valid -- Zaca shoulderband
  Helminthoglypta piutensis Willett, 1938 -- valid -- Saddle shoulderband
  Helminthoglypta proles (Hemphill, 1892) -- valid -- Yosemite shoulderband
  Helminthoglypta reediana Willett, 1932 -- valid -- Lowe Canyon shoulderband
  Helminthoglypta salviae Roth, 1987 -- valid -- sage shoulderband
  Helminthoglypta sanctaecrucis Pilsbry, 1927 -- valid -- Limu 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 -- Erskine Creek shoulderband, paiute shoulderband
  Helminthoglypta stiversiana (J. G. Cooper, 1876) -- valid -- Point Reyes shoulderband
  Helminthoglypta talmadgei Roth, 1988 -- valid -- Trinity shoulderband
  Helminthoglypta taylori Reeder and Roth, 1988 -- valid -- West Fork shoulderband
  Helminthoglypta tejonis S. S. Berry, 1930 -- valid -- Tejon shoulderband
  Helminthoglypta thermimontis S. S. Berry, 1953 -- valid -- Anza shoulderband, coyote 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 uvasana Roth and Hochberg, 1992 -- valid -- grapevine shoulderband
  Helminthoglypta vasquezi Roth and Hochberg, 1992 -- valid -- Vasquez shoulderband
  Helminthoglypta venturensis (Bartsch, 1916) -- valid
  Helminthoglypta walkeriana (Hemphill, 1911) -- valid -- Morro shoulderband
  Helminthoglypta waltoni Gregg and W. B. Miller, 1976 -- valid -- Laguna shoulderband
  Helminthoglypta willetti (S. S. Berry, 1920) -- valid -- Matilija shoulderband
  Helminthoglyptidae -- valid
  Helminthope Salvini-Plawen, 1991 -- valid
  Helminthope psammobionta Salvini-Plawen, 1991 -- valid
  Hemistena Rafinesque, 1820 -- valid
  Hemistena lata (Rafinesque, 1820) -- valid -- cracking pearly mussel
  Hemitoma Swainson, 1840 -- valid
  Hemitoma emarginata (de Blainville, 1825) -- valid -- emarginate emarginula
  Hemitoma octoradiata (Gmelin, 1791) -- valid -- eight-rib emarginula
  Hemitrochus Swainson, 1840 -- valid
  Hemitrochus varians (Menke, 1829) -- valid -- seagrape snail
  Hemphillia Bland and W. G. Binney, 1872 -- valid
  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 Dall, 1905 -- valid
  Hendersonia occulta (Say, 1831) -- valid -- cherrystone drop
  Henrya Bartsch, 1927 -- valid
  Henrya goldmani (Bartsch, 1947) -- valid
  Henrya morrisoni Bartsch, 1947 -- valid
  Here Gabb, 1866 -- valid
  Here excavata (Carpenter, 1857) -- valid -- pit lucine
  Hermaea Loven, 1844 -- valid
  Hermaea cruciata Gould, 1870 -- valid
  Hermaea dendritica (Alder and Hancock, 1843) -- valid -- spanish tenor
  Hermaea kingstoni (T. E. Thompson, 1977) -- valid
  Hermaea vancouverensis O'Donoghue, 1924 -- valid
  Hermaea verticilata (Ortea, 1984) -- valid
  Hermissenda Bergh, 1879 -- valid
  Hermissenda crassicornis (Eschscholtz, 1831) -- valid -- hermissenda
  Herpeteros Berry, 1947 -- valid
  Herpeteros angelus (Gregg, 1949) -- valid -- Soledad desertsnail
  Hesperarion Simroth, 1891 -- valid
  Hesperarion hemphilli (W. G. Binney, 1875) -- valid -- hemphill western slug, Hemphill westernslug
  Hesperarion mariae Branson, 1991 -- valid -- Tillamook westernslug
  Hesperarion niger (J. G. Cooper, 1872) -- valid -- black western slug, black westernslug
  Hespererato Schilder, 1932 -- valid
  Hespererato columbella (Menke, 1847) -- valid -- pigeon erato
  Hespererato maugeriae (J. E. Gray, 1832) -- valid -- green erato
  Hespererato vitellina (Hinds, 1844) -- valid -- appleseed erato
  Heterodonax Morch, 1853 -- valid
  Heterodonax bimaculatus (Linnaeus, 1758) -- valid -- false beanclam, false-bean
  Heterodonax pacificus (Conrad, 1837) -- valid -- pacific false beanclam, Pacific false-bean
  Heterostropha -- valid
  Hexaplex Perry, 1811 -- valid
  Hexaplex fulvescens (G. B. Sowerby II, 1834) -- valid -- giant eastern murex
  Hiatella Bosc, 1801 -- valid
  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
  Hiatellidae Gray, 1824 -- valid
  Hindsiclava Hertlein and Strong, 1955 -- valid
  Hindsiclava alesidota (Dall, 1889) -- valid
  Hindsiclava macilenta (Dall, 1889) -- valid
  Hinea Gray, 1847 -- valid
  Hinea lineata (E. M. da Costa, 1778) -- valid -- dwarf planaxis
  Hipponicidae Troschel, 1861 -- valid
  Hipponix DeFrance, 1819 -- valid
  Hipponix antiquatus (Linnaeus, 1767) -- valid -- white hoofsnail
  Hipponix subrufus (Lamarck, 1819) -- valid -- orange hoofsnail
  Hipponix tumens Carpenter, 1864 -- valid -- ribbed hoofsnail
  Hochbergellus Roth and W. B. Miller, 1992 -- valid
  Hochbergellus hirsutus Roth and W. B. Miller, 1992 -- valid -- Sisters hesperian
  Hojeda H. B. Baker, 1926 -- valid
  Hojeda inaguensis (Weinland, 1880) -- valid -- Keys mudcloak
  Holospira von Martens, 1860 -- valid
  Holospira arizonensis Stearns, 1890 -- valid -- Arizona holospira
  Holospira bilamellata Dall, 1895 -- valid -- bilamellate holospira
  Holospira campestris Pilsbry and Ferriss, 1915 -- valid
  Holospira chiricahuana Pilsbry, 1905 -- valid -- Cave Creek holospira
  Holospira cionella Pilsbry, 1905 -- valid
  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 goldfussi (Menke, 1847) -- valid -- New Braunfels holospira
  Holospira hamiltoni Dall, 1897 -- valid -- Hamilton holospira
  Holospira mesolia Pilsbry, 1912 -- valid -- widemouth holospira
  Holospira metcalfi F. G. Thompson, 1974 -- valid -- Metcalf holospira
  Holospira millestriata Pilsbry and Ferriss, 1915 -- valid
  Holospira montivaga Pilsbry, 1946 -- valid -- vagabond holospira
  Holospira oritis Pilsbry and Cheatum, 1951 -- valid -- mountain holospira
  Holospira pasonis Dall, 1895 -- valid -- robust holospira
  Holospira pityis Pilsbry and Cheatum, 1951 -- valid -- pinecone holospira
  Holospira regis Pilsbry and Cockerell, 1905 -- valid -- royal holospira
  Holospira riograndensis Pilsbry, 1946 -- valid -- Rio Grande holospira
  Holospira sherbrookei Gilbertson, 1989 -- valid -- Silver Creek holospira
  Holospira tantalus Bartsch, 1906 -- valid -- teasing holospira
  Holospira whetstonensis Pilsbry and Ferriss, 1923 -- valid -- Whetstone holospira
  Holospira yucatanensis Bartsch, 1906 -- valid -- Bartsch holospira
  Holsingeria Hershler, 1989 -- valid
  Holsingeria unthanksensis Hershler, 1989 -- valid -- Thankless Ghostsnail
  Homalopoma Carpenter, 1864 -- valid
  Homalopoma albidum (Dall, 1881) -- valid -- white dwarf-turban
  Homalopoma baculum (Carpenter, 1864) -- valid -- berry dwarf-turban
  Homalopoma berryi J. H. McLean, 1964 -- valid
  Homalopoma cordellensis J. H. McLean, 1996 -- valid
  Homalopoma draperi J. H. McLean, 1984 -- valid
  Homalopoma grippi (Dall, 1911) -- valid
  Homalopoma indutum (Watson, 1879) -- valid -- two-faced dwarf-turban
  Homalopoma lacunatum (Carpenter, 1864) -- valid
  Homalopoma luridum (Dall, 1885) -- valid -- dark dwarf-turban
  Homalopoma mimicum LaFollette, 1976 -- valid
  Homalopoma paucicostatum (Dall, 1871) -- valid -- few-rib dwarf-turban, few-ribbed dwarf-turban
  Homalopoma radiatum (Dall, 1918) -- valid -- rayed dwarf-turban
  Homalopoma subobsoletum Willett, 1937 -- valid
  Hopkinsia MacFarland, 1905 -- valid
  Hopkinsia rosacea MacFarland, 1905 -- valid -- Hopkins rose
  Horologica Laseron, 1956 -- valid
  Horologica pupa (Dall and Simpson, 1901) -- valid
  Houbricka Wise, 1996 -- valid
  Houbricka incisa (Bush, 1899) -- valid
  Hoyia F. C. Baker, 1926 -- valid
  Hoyia sheldoni (Pilsbry, 1890) -- valid -- Storm Ghostsnail, storm hydrobe
  Humboldtiana Ihering, 1892 -- valid
  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 (von Martens, 1892) -- valid -- San Carlos 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
  Humboldtianidae -- valid
  Humilaria Grant and Gale, 1931 -- valid
  Humilaria kennerleyi (Reeve, 1863) -- valid -- Kennerley venus, Kennerley's venus
  Huttonella L. Pfeiffer, 1856 -- valid
  Huttonella bicolor (Hutton, 1834) -- valid -- two-tone gulella
  Huxleyia A. Adams, 1860 -- valid
  Huxleyia munita (Dall, 1898) -- valid -- minute nucinellid
  Hyalina Schumacher, 1817 -- valid
  Hyalina cineracea (Dall, 1889) -- valid
  Hyalina pallida (Linnaeus, 1758) -- valid -- pallid marginella
  Hyalocylis de Folin, 1875 -- valid
  Hyalocylis striata (Rang, 1828) -- valid -- striate clio
  Hydatina Schumacher, 1817 -- valid
  Hydatina physis (Linnaeus, 1758) -- valid -- brown-line paper-bubble, brown-line paperbubble
  Hydrobia Hartmann, 1821 -- valid
  Hydrobia booneae Morrison, 1973 -- invalid -- Boone Hydrobe
  Hydrobia truncata (Vanatta, 1924) -- invalid
  Hydrobiidae Stimpson, 1865 -- valid
  Hydromyles globulosus (Rang, 1825) -- valid
  Hydromylidae Pruvot-fol, 1942 -- valid
  Hygromiidae -- valid
  Hypermastus Pilsbry, 1899 -- valid
  Hypermastus randolphi (Vanatta, 1900) -- valid
  Hypselodoris Stimpson, 1855 -- valid
  Hypselodoris bayeri (Ev. Marcus and Er. Marcus, 1967) -- valid
  Hypselodoris californiensis (Bergh, 1879) -- valid -- California blue doris
  Hypselodoris sycilla (Bergh, 1890) -- valid
  Hypselodoris webbi (d'Orbigny, 1839) -- valid -- Florida regal doris
  Ilyanassa Stimpson, 1865 -- invalid
  Ilyanassa obsoleta (Say, 1822) -- invalid -- eastern mudsnail
  Ilyanassa trivittata (Say, 1822) -- invalid -- three-line mudsnail
  Inflectarius Pilsbry, 1940 -- valid
  Inflectarius approximans (G. H. Clapp, 1905) -- valid -- tight-gapped shagreen
  Inflectarius downieanus (Bland, 1861) -- valid -- dwarf globelet
  Inflectarius edentatus (Sampson, 1889) -- valid -- smooth-lip shagreen
  Inflectarius ferrissi (Pilsbry, 1897) -- valid -- Smoky Mountain covert
  Inflectarius inflectus (Say, 1821) -- valid -- shagreen
  Inflectarius kalmianus (Hubricht, 1965) -- valid -- brown globelet
  Inflectarius magazinensis (Pilsbry and Ferriss, 1907) -- valid -- Magazine Mountain shagreen
  Inflectarius rugeli (Shuttleworth, 1852) -- valid -- deep-tooth shagreen
  Inflectarius smithi (G. H. Clapp, 1905) -- valid -- Alabama shagreen
  Inflectarius subpalliatus (Pilsbry, 1893) -- valid -- velvet covert
  Inflectarius verus (Hubricht, 1954) -- valid
  Iniforis Jousseaume, 1884 -- valid
  Iniforis turristhomae (Holten, 1802) -- valid -- St. Thomas triphora
  Inodrillia Bartsch, 1943 -- valid
  Inodrillia acova Bartsch, 1943 -- valid
  Inodrillia aepynota (Dall, 1889) -- valid
  Inodrillia amblytera (Bush, 1893) -- valid
  Inodrillia avira Bartsch, 1943 -- valid
  Inodrillia carpenteri (A. E. Verrill and S. Smith, 1880 -- valid
  Inodrillia dalli (A. E. Verrill and S. Smith, 1882) -- valid
  Inodrillia dido Bartsch, 1943 -- valid
  Inodrillia gibba Bartsch, 1943 -- valid
  Inodrillia hatterasensis Bartsch, 1943 -- valid
  Inodrillia ino Bartsch, 1943 -- valid
  Inodrillia martha Bartsch, 1943 -- valid
  Inodrillia miamia Bartsch, 1943 -- valid
  Inodrillia nucleata (Dall, 1881) -- valid
  Inodrillia vetula Bartsch, 1943 -- valid
  Io Lea, 1831 -- valid
  Io fluvialis (Say, 1825) -- valid -- Spiny Riversnail
  Iothia Forbes, 1849 -- valid
  Iothia lindbergi J. H. McLean, 1985 -- valid
  Iphigenia Schumacher, 1817 -- valid
  Iphigenia brasiliana (Lamarck, 1818) -- valid -- giant coquina, giant false coquina
  Iphitus Jeffreys, 1883 -- valid
  Iphitus robertsi Sabelli and Taviani, 1997 -- valid
  Irusella Hertlein and Grant, 1972 -- valid
  Irusella lamellifera (Conrad, 1837) -- valid -- lamellar venus
  Ischadium Jukes-Browne, 1905 -- valid
  Ischadium recurvum (Rafinesque, 1820) -- valid -- hooked mussel
  Ischnochiton Gray, 1847 -- valid
  Ischnochiton alascensis Thiele, 1910 -- valid
  Ischnochiton allyni Ferreira, 1977 -- invalid
  Ischnochiton boogi Haddon, 1886 -- invalid
  Ischnochiton dilatosculptus Kaas, 1982 -- valid
  Ischnochiton erythronotus (C. B. Adams, 1845) -- valid -- multihued chiton
  Ischnochiton hartmeyeri Thiele, 1910 -- valid -- multiringed chiton
  Ischnochiton interstinctus Gould, 1846 -- invalid
  Ischnochiton newcombi Pilsbry, 1892 -- valid
  Ischnochiton niveus Ferreira, 1987 -- valid
  Ischnochiton papillosus (C. B. Adams, 1845) -- valid
  Ischnochiton pseudovirgatus Kaas, 1972 -- valid -- blue-spot chiton
  Ischnochiton regularis (Carpenter, 1855) -- invalid
  Ischnochiton scrobiculatus (Middendorff, 1847) -- valid
  Ischnochiton striolatus (J. E. Gray, 1828) -- valid
  Ischnochiton trifidus Carpenter, 1864 -- invalid
  Ischnochitonidae Dall, 1889 -- valid
  Iselica Dall, 1918 -- valid
  Iselica anomala (C. B. Adams, 1850) -- valid
  Iselica obtusa (Carpenter, 1864) -- valid
  Iselica ovoidea (Gould, 1853) -- valid
  Isognomon Lightfoot, 1786 -- valid
  Isognomon alatus (Gmelin, 1791) -- valid -- flat tree-oyster
  Isognomon bicolor (C. B. Adams, 1845) -- valid -- bicolor purse-oyster, bicolored purse-oyster
  Isognomon janus Carpenter, 1857 -- valid -- thin purse-oyster
  Isognomon radiatus (Anton, 1839) -- valid -- lister purse-oyster, radial purse-oyster
  Isognomon recognitus (Mabille, 1895) -- valid -- purple purse-oyster
  Isognomonidae Woodring, 1925 -- valid
  Isorobitella Keen, 1962 -- valid
  Isorobitella trigonalis (Carpenter, 1857) -- valid -- trigonal montacutid
  Issena Iredale and O'Donoghue, 1923 -- invalid
  Issena pacifica (Bergh, 1894) -- invalid
  Issena ramosa (A. E. Verrill and Emerton, 1881) -- invalid
  Ithycythara Woodring, 1928 -- valid
  Ithycythara auberiana (d'Orbigny, 1842) -- valid
  Ithycythara cymella (Dall, 1889) -- valid
  Ithycythara lanceolata (C. B. Adams, 1850) -- valid
  Ithycythara parkeri Abbott, 1958 -- valid
  Ithycythara pentagonalis (Reeve, 1845) -- valid
  Ithycythara psila (Bush, 1885) -- valid
  Ividella Dall and Bartsch, 1909 -- valid
  Ividella navisa (Dall and Bartsch, 1907) -- valid
  Ividia Dall and Bartsch, 1904 -- valid
  Ividia abbotti (Olsson and McGinty, 1958) -- valid
  Ividia havanensis (Pilsbry and Aguayo, 1933) -- valid
  Janolidae -- valid
  Janolus Bergh, 1884 -- valid
  Janolus barbarensis (J. G. Cooper, 1863) -- valid -- cockscomb nudibranch
  Janolus comis Er. Marcus, 1955 -- valid
  Janolus fuscus O'Donohue, 1924 -- valid
  Janolus mucloc (Er. Marcus, 1958) -- valid
  Janthina Roding, 1798 -- valid
  Janthina exigua Lamarck, 1816 -- valid -- dwarf janthina
  Janthina globosa Swainson, 1822 -- valid -- elongate janthina
  Janthina janthina (Linnaeus, 1758) -- valid -- janthina
  Janthina pallida W. Thompson, 1840 -- valid -- pale janthina
  Janthinidae Leach, 1823 -- valid
  Japonactaeon I. Taki, 1956 -- valid
  Japonactaeon pusillus (Forbes, 1843) -- valid -- miniature baby-bubble
  Jaspidella Olsson, 1956 -- valid
  Jaspidella blanesi (Ford, 1898) -- valid
  Jaspidella jaspidea (Gmelin, 1791) -- valid -- jasper dwarf olive
  Jaspidella miris Olsson, 1956 -- valid
  Jorunna Bergh, 1876 -- valid
  Jorunna pardus Behrens and R. Henderson, 1981 -- valid -- leopard jorunna
  Jouannetia Desmoulins, 1828 -- valid
  Jouannetia quillingi Turner, 1955 -- valid -- quilling piddock, spiny piddock
  Juga H. Adams and A. Adams, 1854 -- valid
  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
  Juliacorbula Olsson and Harbison, 1953 -- valid
  Juliacorbula cubaniana (d'Orbigny, 1842) -- valid -- Cuba corbula
  Juliacorbula luteola (Carpenter, 1864) -- valid -- western corbula
  Juliidae E. A. Smith, 1885 -- valid
  Juvenichiton Sirenko, 1975 -- valid
  Juvenichiton deplanatus (Sirenko, 1975) -- valid
  Juvenichiton saccharinus (Dall, 1878) -- valid
  Kaiparapelta B. A. Marshall, 1986 -- valid
  Kaiparapelta askewi J. H. McLean and Harasewych, 1995 -- valid
  Katharina Gray, 1847 -- valid
  Katharina tunicata (W. Wood, 1815) -- valid -- black katy
  Kelletia P. Fischer, 1884 -- valid
  Kelletia kelletii (Forbes, 1850) -- valid
  Kellia Turton, 1822 -- valid
  Kellia laperousii (Deshayes, 1839) -- invalid -- La Perouse kellyclam
  Kellia suborbicularis (Montagu, 1803) -- valid -- suborbicular kellyclam
  Kentrodorididae -- valid
  Kleinella A. Adams, 1860 -- valid
  Kleinella cedrosa (Dall, 1884) -- valid
  Kurtzia Bartsch, 1944 -- valid
  Kurtzia arteaga (Dall and Bartsch, 1910) -- valid -- beaded mangelia
  Kurtziella Dall, 1918 -- valid
  Kurtziella accincta (Montagu, 1808) -- valid
  Kurtziella atrostyla (Tryon, 1884) -- valid -- brown-tip mangelia
  Kurtziella cerina (Kurtz and Stimpson, 1851) -- valid
  Kurtziella citronella (Dall, 1886) -- valid -- yellow mangelia
  Kurtziella dorvilliae (Reeve, 1845) -- valid
  Kurtziella limonitella (Dall, 1884) -- valid -- punctate mangelia
  Kurtziella newcombei (Dall, 1919) -- valid
  Kurtziella perryae Bartsch and Rehder, 1939 -- valid
  Kurtziella plumbea (Hinds, 1843) -- valid -- violet-band mangelia
  Kurtziella variegata (Carpenter, 1864) -- valid -- tan mangelia
  Kurtzina Bartsch, 1944 -- valid
  Kurtzina beta (Dall, 1919) -- valid
  Kylix Dall, 1919 -- valid
  Kylix halocydne (Dall, 1919) -- valid
  Lacteoluna Pilsbry, 1926 -- valid
  Lacteoluna selenina (Gould, 1848) -- valid -- moonlight mudcloak
  Lacuna Turton, 1827 -- valid
  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 porrecta Carpenter, 1864 -- valid
  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 Philippi, 1846 -- valid
  Laemodonta cubensis (Pfeiffer, 1854) -- valid -- Cuba dwarf pedipes
  Laevapex Walker, 1903 -- valid
  Laevapex diaphanus (Haldeman, 1841) -- invalid -- cymbal ancylid
  Laevapex fuscus (C. B. Adams, 1841) -- valid -- Dusky Ancylid
  Laevapex peninsulae (Pilsbry, 1903) -- invalid -- peninsula ancylid
  Laevicardium Swainson, 1840 -- valid
  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 Simroth, 1913 -- valid
  Laevicaulis alte (Ferussac, 1821) -- valid -- tropical leatherleaf
  Laevichlamys Waller, 1993 -- valid
  Laevichlamys multisquamata (Dunker, 1864) -- valid -- many-ribbed scallop
  Laevinesta Pilsbry and McGinty, 1952 -- valid
  Laevinesta atlantica (Perez Farfante, 1947) -- valid -- Atlantic nesta
  Laevipilina McLean, 1979 -- valid
  Laevipilina hyalina J. H. McLean, 1979 -- valid
  Laevipilinidae -- valid
  Laila MacFarland, 1905 -- valid
  Laila cockerelli MacFarland, 1905 -- valid
  Lamellaria Montagu, 1815 -- valid
  Lamellaria diegoensis Dall, 1885 -- valid -- San Diego lamellaria
  Lamellaria digueti Rochebrune, 1895 -- valid
  Lamellaria koto Schwengel, 1944 -- valid
  Lamellaria leucosphaera Schwengel, 1942 -- valid -- white-ball lamellaria
  Lamellaria perspicua (Linnaeus, 1758) -- valid -- transparent lamellaria
  Lamellariidae Orbigny, 1841 -- valid
  Lamellaxis Strebel and Pfeffer, 1882 -- valid
  Lamellaxis micra (d'Orbigny, 1835) -- valid -- tiny awlsnail
  Lamellitrochus Quinn, 1991 -- valid
  Lamellitrochus carinatus Quinn, 1991 -- valid -- keeled solarelle
  Lamellitrochus inceratus Quinn, 1991 -- valid -- waxy solarelle
  Lamellitrochus lamellosus (A. E. Verrill and S. Smith, 1880) -- valid -- lamellose solarelle
  Lampeia MacGinitie, 1959 -- valid
  Lampeia adamsi (MacGinitie, 1959) -- valid -- pillar thraciid
  Lampsilis Rafinesque, 1820 -- valid
  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 -- valid -- 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 (Gmelin, 1791) -- valid -- eastern lampmussel
  Lampsilis radiata conspicua (Lea, 1872) -- invalid
  Lampsilis radiata radiata (Gmelin, 1791) -- invalid -- eastern lampmussel
  Lampsilis rafinesqueana Frierson, 1927 -- valid -- Neosho mucket
  Lampsilis reeveiana (Lea, 1852) -- valid -- Arkansas broken-ray
  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 (Conrad, 1834) -- valid -- rough 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 Clessin, 1882 -- valid
  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
  Lapinura Er. Marcus and Ev. Marcus, 1970 -- valid
  Lapinura divae (Ev. Marcus and Er. Marcus, 1963) -- valid
  Lasaea T. Brown, 1827 -- valid
  Lasaea adansoni (Gmelin, 1791) -- valid -- adanson lepton, reddish lepton
  Lasaeidae Gray, 1847 -- valid
  Laseadae Gray, 1847 -- invalid
  Lasmigona Rafinesque, 1831 -- valid
  Lasmigona complanata (Barnes, 1823) -- valid -- white heelsplitter
  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
  Latirus Montfort, 1810 -- valid
  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
  Learchis Bergh, 1896 -- valid
  Learchis poica Ev. Marcus and Er. Marcus, 1960 -- valid
  Ledella A. E. Verrill and Bush, 1897 -- valid
  Ledella fiascona (Dall, 1916) -- valid -- Baja miniature nutclam
  Lehmannia Heynemann, 1863 -- valid
  Lehmannia valentiana (Ferussac, 1821) -- valid -- threeband gardenslug
  Leidyula H. B. Baker, 1925 -- valid
  Leidyula floridana (Leidy, 1851) -- valid -- Florida leatherleaf
  Leidyula kraussi (Ferussac, 1823) -- valid -- dappled leatherleaf
  Leidyula moreleti (Crosse and P. Fischer, 1872) -- valid -- tan leatherleaf
  Leiomya A. Adams, 1864 -- valid
  Leiomya claviculata (Dall, 1881) -- valid -- clavicle myoneria
  Lemiox Rafinesque, 1831 -- valid
  Lemiox rimosus (Rafinesque, 1831) -- valid -- birdwing pearly mussel
  Lepeta J. E. Gray, 1842 -- valid
  Lepeta caeca (Muller, 1776) -- valid -- northern blind limpet
  Lepetidae Gray, 1850 -- valid
  Lepidochitona Gray, 1821 -- valid
  Lepidochitona aleutica (Dall, 1879) -- valid
  Lepidochitona beanii (Carpenter, 1864) -- valid
  Lepidochitona berryana Eernisse, 1986 -- valid
  Lepidochitona caverna Eernisse, 1986 -- valid
  Lepidochitona dentiens (Gould, 1846) -- valid
  Lepidochitona fernaldi Eernisse, 1986 -- valid
  Lepidochitona flectens (Carpenter, 1864) -- valid
  Lepidochitona gothica (Carpenter, 1864) -- valid
  Lepidochitona hartwegii (Carpenter, 1855) -- valid
  Lepidochitona heathii (Pilsbry, 1898) -- invalid
  Lepidochitona keepiana S. S. Berry, 1948 -- valid
  Lepidochitona liozonis (Dall and Simpson, 1901) -- valid -- Caribbean red chiton
  Lepidochitona lobium (S. S. Berry, 1925) -- invalid
  Lepidochitona lowei (Pilsbry, 1918) -- valid
  Lepidochitona lowei fackenthallae (S. S. Berry, 1919) -- invalid
  Lepidochitona semilirata (S. S. Berry, 1927) -- valid
  Lepidochitona thamnopora (S. S. Berry, 1911) -- valid
  Lepidochitona thomasi (Pilsbry, 1898) -- valid
  Lepidopleuridae Pilsbry, 1892 -- invalid
  Lepidozona Pilsbry, 1892 -- valid
  Lepidozona allyni (Ferreira, 1977) -- valid
  Lepidozona cooperi (Dall, 1879) -- valid
  Lepidozona ima Sirenko, 1975 -- valid
  Lepidozona interstincta (Gould, 1846) -- valid
  Lepidozona mertensii (Middendorff, 1847) -- valid
  Lepidozona pectinulata (Carpenter, 1893) -- valid
  Lepidozona regularis (Carpenter, 1855) -- valid
  Lepidozona retiporosa (Carpenter, 1864) -- valid
  Lepidozona scabricostata (Carpenter, 1864) -- valid
  Lepidozona serrata (Carpenter, 1864) -- valid
  Lepidozona sinudentata (Carpenter, 1892) -- valid
  Lepidozona trifida (Carpenter, 1864) -- valid
  Lepidozona willetti (S. S. Berry, 1917) -- valid
  Leporimetis Iredale, 1930 -- valid
  Leporimetis intastriata (Say, 1827) -- valid -- atlantic fat tellin, Atlantic fat-tellin
  Leporimetis obesa (Deshayes, 1855) -- valid -- california fat tellin, California fat-tellin
  Leptadrillia Woodring, 1928 -- valid
  Leptadrillia cookei (E. A. Smith, 1888) -- valid
  Leptaxinus A. E. Verrill and Bush, 1898 -- valid
  Leptaxinus minutus A. E. Verrill and Bush, 1898 -- valid -- minute axinopsid
  Leptochiton Gray, 1847 -- valid
  Leptochiton alveolus (M. Sars in Lovén, 1846) -- valid
  Leptochiton arcticus (G. O. Sars, 1878) -- valid
  Leptochiton nexus Carpenter, 1864 -- valid
  Leptochiton rugatus (Pilsbry, 1892) -- valid
  Leptodea Rafinesque, 1820 -- valid
  Leptodea fragilis (Rafinesque, 1820) -- valid -- fragile papershell
  Leptodea leptodon (Rafinesque, 1820) -- valid -- scaleshell
  Leptodea ochracea (Say, 1817) -- valid -- tidewater mucket
  Leptogyra Bush, 1897 -- valid
  Leptogyra alaskana Bartsch, 1910 -- valid
  Lepton Turton, 1822 -- valid
  Lepton lepidum Say, 1826 -- valid -- graceful lepton
  Leptopecten A. E. Verrill, 1897 -- valid
  Leptopecten latiauratus (Conrad, 1837) -- valid -- kelp scallop
  Leptoxis Rafinesque, 1819 -- valid
  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 riversnail, boulder snail
  Leptoxis crassa anthonyi (Redfield, 1854) -- invalid
  Leptoxis crassa crassa (Haldeman, 1841) -- invalid -- 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 torrefacta (H. H. Smith in Goodrich, 1922) -- valid -- Squat 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 Pilsbry and Olsson, 1951 -- valid
  Lepyrium showalteri (Lea, 1861) -- valid -- Flat Pebblesnail
  Leuconopsis Hutton, 1884 -- valid
  Leuconopsis novimundi (Pilsbry and McGinty, 1949) -- valid
  Leucosyrinx Dall, 1889 -- valid
  Leucosyrinx kincaidi Dall, 1919 -- valid
  Leucozonia Gray, 1847 -- valid
  Leucozonia jacarusoi Petuch, 1987 -- valid
  Leucozonia nassa (Gmelin, 1791) -- valid -- chestnut latirus
  Leucozonia ocellata (Gmelin, 1791) -- valid -- white-spot latirus
  Lexingtonia Ortmann, 1914 -- invalid
  Lexingtonia dolabelloides (Lea, 1840) -- invalid -- slabside pearly mussel
  Lexingtonia subplana (Conrad, 1837) -- invalid -- Virginia pigtoe
  Ligumia Swainson, 1840 -- valid
  Ligumia nasuta (Say, 1817) -- valid -- eastern pondmussel
  Ligumia recta (Lamarck, 1819) -- valid -- black sandshell
  Ligumia subrostrata (Say, 1831) -- valid -- pondmussel
  Liguus Montfort, 1810 -- valid
  Liguus fasciatus (Muller, 1774) -- valid -- Florida treesnail
  Lima Bruguiere, 1789 -- valid
  Lima excavata (Fabricius, 1779) -- valid -- excavated fileclam
  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 scabra (Born, 1778) -- valid -- rough fileclam
  Limacidae -- valid
  Limacina Bosc, 1817 -- valid
  Limacina bulimoides (d'Orbigny, 1836) -- valid -- bulimoid pteropod
  Limacina helicina (Phipps, 1774) -- valid -- helicid pteropod
  Limacina inflata (d'Orbigny, 1836) -- valid -- planorbid pteropod
  Limacina lesueurii (d'Orbigny, 1836) -- valid
  Limacina retroversa (Fleming, 1823) -- valid -- retrovert pteropod
  Limacina trochiformis (d'Orbigny, 1836) -- valid -- trochiform pteropod
  Limacinidae Blainville, 1823 -- valid
  Limapontia Johnston, 1836 -- valid
  Limapontia zonata (Girard, 1852) -- valid
  Limapontiidae Gray, 1847 -- valid
  Limaria Link, 1807 -- valid
  Limaria hemphilli (Hertlein and Strong, 1946) -- valid -- Hemphill fileclam, phemphill fileclam
  Limaria pellucida (C. B. Adams, 1846) -- valid -- Antillean fileclam
  Limatula S. V. Wood, 1839 -- valid
  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 -- Arctic fileclam, boreal fileclam
  Limatula japonica A. Adams, 1864 -- valid -- Japan fileclam
  Limatula regularis A. E. Verrill and Bush, 1898 -- valid -- aregular fileclam, regular fileclam
  Limatula saturna Bernard, 1978 -- valid -- Saturna fileclam, saturnine fileclam
  Limatula setifera Dall, 1886 -- valid -- bristly fileclam
  Limatula similaris (Dall, 1908) -- valid -- furrowless fileclam
  Limatula subauriculata (Montagu, 1808) -- valid -- small-ear fileclam
  Limax Linnaeus, 1758 -- valid
  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
  Limea Bronn, 1831 -- valid
  Limea bronniana Dall, 1886 -- valid -- bronn fileclam, dwarf fileclam
  Limea subovata (Jeffreys, 1876) -- valid -- subovate fileclam
  Limidae Rafinesque, 1815 -- valid
  Limifossor Heath, 1904 -- valid
  Limifossor fratula Heath, 1911 -- valid -- southern mole glistenworm
  Limifossor talpoideus Heath, 1911 -- valid -- northern mole glistenworm
  Limifossoridae Salvini-Plawen, 1968 -- valid
  Limoida -- valid
  Limopsidae Dall, 1895 -- valid
  Limopsis Sasso, 1827 -- valid
  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 minuta Philippi, 1836 -- valid -- minute limops
  Limopsis panamensis Dall, 1902 -- valid -- Panamic limops
  Limopsis sulcata A. E. Verrill and Bush, 1898 -- valid -- asulcate limops, sulcate limops
  Linatella Gray, 1857 -- valid
  Linatella caudata (Gmelin, 1791) -- valid -- ringed triton
  Lindapecten Petuch, 1995 -- valid
  Lindapecten exasperatus (G. B. Sowerby II, 1842) -- valid -- thistle scallop
  Lindapecten lindae Petuch, 1995 -- valid
  Lindapecten muscosus (W. Wood, 1828) -- valid -- rough scallop
  Linisa Pilsbry, 1930 -- valid
  Linisa tamaulipasensis (I. Lea, 1857) -- valid -- dryland liptooth
  Linisa texasiana (Moricand, 1833) -- valid -- Texas liptooth
  Lioberus Dall, 1898 -- valid
  Lioberus castaneus (Say, 1822) -- valid -- chestnut mussel
  Liocyma fluctuosum (Gould, 1841) -- valid -- varnished liocyma, wavy liocyma
  Liocyma viride Dall, 1871 -- invalid -- green liocyma
  Liomesus Stimpson, 1865 -- valid
  Liomesus nassula Dall, 1901 -- valid -- basket whelk
  Liomesus nux Dall, 1877 -- invalid -- nut whelk
  Liomesus ooides (Middendorff, 1848) -- invalid -- egg whelk
  Liomesus stimpsoni Dall, 1889 -- valid
  Lioplax Troschel, 1857 -- valid
  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
  Lioplax talquinensis Vail, 1979 -- invalid
  Liostomia G. O. Sars, 1878 -- valid
  Liostomia eburnea (Stimpson, 1851) -- valid
  Liotia G. B. Sowerby I, 1834 -- valid
  Liotia fenestrata Carpenter, 1864 -- valid -- California cyclostreme
  Lirabuccinum Vermeij, 1991 -- valid
  Lirabuccinum dirum (Reeve, 1846) -- valid -- dire whelk
  Lirobarleeia Ponder, 1983 -- valid
  Lirobarleeia kelseyi (Dall and Bartsch, 1902) -- valid
  Lirobittium Bartsch, 1911 -- valid
  Lirobittium armillatum (Carpenter, 1864) -- valid
  Lirobittium attenuatum (Carpenter, 1864) -- valid -- slender cerith
  Lirobittium fetellum (Bartsch, 1911) -- valid
  Lirobittium interfossum (Carpenter, 1864) -- valid
  Lirobittium johnstonae Bartsch, 1911 -- valid
  Lirobittium larum (Bartsch, 1911) -- valid
  Lirobittium lomaense (Bartsch, 1911) -- valid
  Lirobittium munitum (Carpenter, 1864) -- valid
  Lirobittium oldroydae Bartsch, 1911 -- valid
  Lirobittium purpureum (Carpenter, 1864) -- valid
  Lirobittium quadrifilatum (Carpenter, 1864) -- valid -- four-thread cerith
  Lirobittium rugatum (Carpenter, 1864) -- valid
  Lirobittium serra Bartsch, 1917 -- valid
  Lirophora Conrad, 1883 -- valid
  Lirophora clenchi (Pulley, 1952) -- valid -- Clench venus, thick-ringed venus
  Lirophora latilirata (Conrad, 1841) -- valid -- imperial venus
  Lirularia Dall, 1909 -- valid
  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-spot lirularia, few-spotted lirularia
  Lirularia succincta (Carpenter, 1864) -- valid -- girdled lirularia
  Lissodrillia Bartsch and Rehder, 1939 -- valid
  Lissodrillia schroederi (Bartsch and Rehder, 1939) -- valid
  Lissodrillia simpsoni (Dall, 1887) -- valid
  Lithasia Haldeman, 1840 -- valid
  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 Roding, 1798 -- valid
  Lithophaga antillarum (d'Orbigny, 1842) -- valid -- giant datemussel
  Lithophaga aristata (Dillwyn, 1817) -- valid -- scissor datemussel
  Lithophaga attenuata (Deshayes, 1836) -- valid -- attenuated datemussel
  Lithophaga bisulcata (d'Orbigny, 1842) -- valid -- mahogany datemussel
  Lithophaga nigra (d'Orbigny, 1842) -- valid -- black datemussel
  Lithophaga plumula (Hanley, 1844) -- valid -- feather datemussel
  Lithophaga plumula kelseyi Hertlein and Strong, 1946 -- invalid -- kelsey datemussel
  Lithopoma Gray, 1850 -- valid
  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 Rang, 1829 -- valid
  Litiopa melanostoma Rang, 1829 -- valid -- sargassum snail
  Litiopidae -- valid
  Littoraria Griffith and Pidgeon, 1834 -- valid
  Littoraria angulifera (Lamarck, 1822) -- valid -- mangrove periwinkle
  Littoraria irrorata (Say, 1822) -- valid -- marsh periwinkle
  Littoraria nebulosa (Lamarck, 1822) -- valid -- cloudy periwinkle
  Littoraria tessellata (Philippi, 1847) -- valid
  Littoridina Eydoux and Souleyet, 1852 -- valid
  Littoridina crosseana (Pilsbry, 1910) -- valid
  Littoridinops Pilsbry, 1952 -- valid
  Littoridinops monroensis (Frauenfeld, 1863) -- valid -- Cockscomb Hydrobe
  Littoridinops palustris F. G. Thompson, 1968 -- valid -- Bantam Hydrobe
  Littoridinops tenuipes (Couper, 1844) -- valid -- Henscomb Hydrobe
  Littorina Ferussac, 1822 -- valid
  Littorina aleutica Dall, 1872 -- valid
  Littorina keenae Rosewater, 1978 -- valid -- eroded periwinkle
  Littorina littorea (Linnaeus, 1758) -- valid -- common periwinkle
  Littorina obtusata (Linnaeus, 1758) -- valid -- yellow periwinkle
  Littorina plena Gould, 1849 -- valid
  Littorina saxatilis (Olivi, 1792) -- valid -- rough periwinkle
  Littorina scutulata Gould, 1849 -- valid -- checkered periwinkle
  Littorina sitkana Philippi, 1846 -- valid -- Sitka periwinkle
  Littorina squalida Broderip and G. B. Sowerby I, 1829 -- valid
  Littorina subrotundata (Carpenter, 1864) -- valid
  Littorinidae Gray, 1840 -- valid
  Lobiger Krohn, 1847 -- valid
  Lobiger souverbii P. Fischer, 1857 -- valid
  Lobosculum Pilsbry, 1930 -- valid
  Lobosculum pustula (Ferussac, 1832) -- valid -- grooved liptooth
  Lobosculum pustuloides (Bland, 1858) -- valid -- tiny liptooth
  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 inshore squid, roper squid
  Lolliguncula brevis (Blainville, 1823) -- valid -- Atlantic brief squid
  Lomanotidae -- valid
  Lomanotus Verany, 1844 -- valid
  Lomanotus vermiformis Eliot, 1908 -- valid
  Lottia G. B. Sowerby I, 1834 -- valid
  Lottia alveus (Conrad, 1831) -- valid -- bowl limpet
  Lottia alveus alveus (Conrad, 1831) -- valid -- bowl limpet
  Lottia alveus parallela (Dall, 1914) -- valid -- bowl limpet
  Lottia asmi (Middendorff, 1847) -- valid -- black limpet
  Lottia borealis (Lindberg, 1982) -- valid -- boreal limpet
  Lottia conus (Test, 1945) -- valid
  Lottia digitalis (Rathke, 1833) -- valid -- ribbed limpet
  Lottia gigantea G. B. Sowerby I, 1834 -- valid -- owl limpet
  Lottia instabilis (Gould, 1846) -- valid -- unstable limpet
  Lottia jamaicensis (Gmelin, 1791) -- valid -- Jamaica limpet
  Lottia leucopleura (Gmelin, 1791) -- valid -- black-rib limpet
  Lottia limatula (Carpenter, 1864) -- valid -- file limpet