Classification of Gingerich 1987
Cl. Gastropoda Cuvier 1795 [snail]
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Subcl. Pulmonata Cuvier 1817 [pulmonate]
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Fm. Endodontidae Pilsbry 1895
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Fm. †Grangerellidae Russell 1931
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G. †Grangerella Cockerell 1915
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†Grangerella phenacodorum Cockerell 1914
†Grangerella sinclairi Cockerell 1912
Fm. Oreohelicidae Pilsbry 1939
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Fm. Ardeidae Leach 1820 [heron]
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Fm. Didelphidae Gray 1821 [opossum]
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Fm. †Nyctitheriidae Simpson 1928
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Fm. †Microsyopidae Osborn and Wortman 1892
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Fm. †Carpolestidae Simpson 1935
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Fm. †Viverravidae Wortman and Matthew 1899
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Fm. †Neoplagiaulacidae Ameghino 1890
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Fm. †Palaeochiropterygidae Revilliod 1917
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