Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Protostomia
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| Superphylum | Spiralia
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| Phylum | Mollusca
– mollusques, molusco, molluscs, mollusks |
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| Class | Gastropoda Cuvier, 1797
– gastropods, slugs, snails, escargots, gastéropodes, limaces, caracol, caramujo, lesma |
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| Subclass | Orthogastropoda
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| Infraclass | Caenogastropoda
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| Order | Littorinida
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| Suborder | Rissoidina
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| Superfamily | Truncatelloidea Gray, 1840
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| Family | Tornidae Sacco, 1896
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| Genus | Circulus Jeffreys, 1865 |
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Direct Children: |
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| Species | Circulus cosmius Bartsch, 1907
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| Species | Circulus cubanus Pilsbry and Aguaya, 1933
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| Species | Circulus dalli Bush, 1897
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| Species | Circulus hendersoni (Olsson and McGinty, 1958)
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| Species | Circulus liratus (Verrill, 1882)
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| Species | Circulus margaritiformis Dall, 1927
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| Species | Circulus multistriatus (A. E. Verrill, 1884)
– threaded vitrinella | |
| Species | Circulus rossellinus Dall, 1919
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| Species | Circulus semisculptus (Olsson and McGinty, 1958)
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| Species | Circulus suppressus (Dall, 1889)
– suppressed vitrinella | |
| Species | Circulus texanus (Moore, 1965)
– Texas vitrinella | |
| Species | Circulus translucens Dall, 1927
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