Classification of Aberhan and Fursich 1991
Subg. †Protothaca (Tropithaca) Olsson 1961
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Protothaca (Tropithaca) grata Say 1831
Subg. Parvilucina (Cavilinga) Chavan 1937
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Parvilucina (Cavilinga) prolongata Carpenter 1857
Subg. Mactra (Mactrotoma) Dall 1894 [surfclam]
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Mactra (Mactrotoma) nasuta Gould 1851