Classification of Schenck 1936
Fm. Nuculidae Gray 1824 [nut clam]
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G. Acila Adams and Adams 1858 [divaricate nutclam]
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Subg. Acila (Truncacila) Grant and Gale 1931
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†Acila (Truncacila) bivirgata Sowerby 1836
Acila (Truncacila) castrensis Hinds 1843
†Acila (Truncacila) conradi Meek 1864
†Acila (Truncacila) dalli Arnold 1908
†Acila (Truncacila) demessa Finlay 1927
†Acila (Truncacila) hokkaidoensis Nagao 1932