Classification of the genus Elphidium
G. Elphidium Monfort 1808
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Elphidium advenum Cushman 1922
†Elphidium asagaiense Asano 1949
†Elphidium californicum Cook 1959
Elphidium discoidale d'Orbigny 1839
Elphidium ingressans Dorreen 1948
Elphidium lanieri d'Orbigny 1839
†Elphidium latispatium Poag 1966
†Elphidium latispatium pontium d'Orbigny 1948
Elphidium margaritaceum Cushman 1930
†Elphidium neocrespinae Gibson 1983
†Elphidium nitidium Dorreen 1948
Elphidium oceanicum Cushman 1933
†Elphidium omotoensis Dorreen 1948
Elphidium sagrum d'Orbigny 1839
Elphidium simplex Cushman 1933
†Elphidium yumotoense Asano 1949