Classification of Richards 1943
G. Diodora Gray 1821
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G. Crepidula Lamarck 1799
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Crepidula fornicata Linnaeus 1758
Crepidula plana Say 1822
G. Polinices Monfort 1810 [moon snail]
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†Polinices hemicrypta Gabb 1860
†Polinices judsoni Maury 1910
G. Busycon Röding 1798 [whelk]
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G. Rapana Schumacher 1817
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†Rapana gilletti Richards 1943
†Rapana vaughani Mansfield 1937
G. Pecten Müller 1776
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†Pecten elixatus Conrad 1846
†Pecten trentensis Harris 1919
G. Gemma Deshayes 1853
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G. Venericardia Lamarck 1801
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†Venericardia granulata Say 1824
†Venericardia nodifera Kellum 1926
G. Phacoides Blainville 1825
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†Phacoides nocariensis Kellum 1926
†Phacoides silicatus Mansfield 1937
†Crassatella mississippiensis Conrad 1848
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†Crassatella mississippiensis silverdalensis Kellum 1926