Classification of Amano et al. 2019

Fm. Thyasiridae Dall 1901
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G. Conchocele Gabb 1866
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†Conchocele yatsuoensis Amano et al. 2019
Fm. Vesicomyidae Dall 1908
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Subfm. †Pliocardiinae Woodring 1925
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G. †Adulomya
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†Adulomya chitanii Kanehara 1937
G. †Pliocardia Woodring 1925
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†Pliocardia kawadai Aoki 1954
Fm. Nucinellidae Vokes 1956 [Nut Clam]
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G. Nucinella Wood 1850