Classification of Arnold and Hannibal 1913

G. Crassatellites Krueger 1823
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†Crassatellites uvasana Conrad 1855
G. Macoma Leach 1819
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†Macoma lorenzoensis Arnold 1908
G. Macrocallista Meek 1876
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†Macrocallista newcombei Merriam 1897
G. Paphia Röding 1798
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Paphia staminea Conrad 1837
Paphia stayleyi Gabb 1866
Paphia tenerrima Carpenter 1857
G. Psephidia Dall 1902
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Psephidia lordi Baird 1863 [lord dwarf-venus]
G. Siliqua Mühlfeld 1811
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Siliqua nuttallii Conrad 1837
G. Spisula Gray 1837
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Spisula falcata Gould 1850
†Spisula voyi Gabb 1866
G. Thracia Blainville 1824
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Thracia trapezoidea Conrad 1849
G. Phacoides Blainville 1825
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G. Kennerlyia Carpenter 1864
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