Classification of Schultz and Cheatum 1970

†Bison occidentalis Lucas 1898
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Invalid names: Bison texanus Hay and Cook 1928 [synonym]
Fm. Planorbidae Rafinesque 1815
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G. Gyraulus Charpentier 1837
G. Helisoma Swainson 1940
G. Promenetus Baker 1935
Fm. Sphaeriidae Deshayes 1855
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G. Pisidium Pfeiffer 1821 [pea clam]
G. Sphaerium Scopoli 1777 [fingernail clam]
Infraor. Stylommatophora Schmidt 1856 [slug]
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Fm. Succineidae Beck 1837 [amber snail]
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G. Succinea Draparnaud 1801
Fm. Zonitidae Mörch 1864 [true glass snail]
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G. Hawaiia Gude 1911
Fm. Lymnaeidae Rafinesque 1815
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G. Fossaria Westerlund 1885
G. Stagnicola Jeffreys 1830
Fm. Physidae Fitzinger 1833
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G. Physa Draparnaud 1801
Fm. Valloniidae Morse 1864
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G. Vallonia Risso 1826
Fm. Endodontidae Pilsbry 1895
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G. Helicodiscus Morse 1864
Fm. Pupillidae Turton 1831
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G. Gastrocopta Wollaston 1878
G. Pupilla Leach 1828
G. Pupoides Pfeiffer 1854
G. Vertigo Muller 1774