Classification of Kafanov et al. 2005
G. Yoldia Möller 1842
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G. Periploma Schumacher 1816
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Subg. †Periploma (Aelga)
Subg. Periploma (Periploma) Schumacher 1816
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†Periploma (Periploma) pulchella Hatai and Nisiyama 1949
Subg. Acila (Acila) Adams and Adams 1858
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†Acila (Acila) brevis Nagao and Huzioka 1941
Subg. Nemocardium (Nemocardium) Meek 1876
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†Nemocardium (Nemocardium) yokoyamai Takeda 1953