Classification of the genus Gemma
G. Gemma Deshayes 1853
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†Gemma cravenensis Gardner 1943
Gemma gemma Totten 1834
†Gemma magna Dall 1903
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†Gemma magna majorina Gardner 1943
†Gemma magna striata Richards 1943
†Gemma magna virginiana Dall 1903
†Gemma magna insulcata Gardner 1943
†Gemma sanctimauricensis Harris 1919
†Gemma verdevilla Gardner 1943