Classification of the genus Willimactra
G. †Willimactra Saul 1973
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Subg. †Willimactra (Petromactra) Saul 1973
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†Willimactra (Petromactra) mathewsonii Gabb 1864
†Willimactra (Petromactra) truncata Gabb 1864
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Invalid names: Spisula chicoensis Packard 1916 [synonym]
Subg. †Willimactra (Willimactra) Saul 1973
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†Willimactra (Willimactra) popenoei Saul 1973
†Willimactra (Willimactra) putida Saul 1973