Classification of the genus Strophostylus
G. †Strophostylus Hall 1859
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†Strophostylus andrewsi Hall 1859
†Strophostylus bivolve White and Whitfield 1862
†Strophostylus cancellata Hall 1847
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Invalid names: Cyclonema (Cyclonemina) contexta Perner 1903 [synonym]
†Strophostylus chesterensis Thein and Nitecki 1974
†Strophostylus cyclostomus Hall 1864
†Strophostylus elegans Hall 1859
†Strophostylus elevatus Hall 1868
†Strophostylus fitchi Hall 1859
†Strophostylus fortuitus Mazaev 2019
†Strophostylus girtyi Knight 1934
†Strophostylus globosus Hall 1859
†Strophostylus matheri Hall 1859
†Strophostylus nevadensis Gordon and Yochelson 1983
†Strophostylus obtusus Hall 1859
†Strophostylus sargalensis Reed 1944
†Strophostylus tantillus Gordon and Yochelson 1983
†Strophostylus transversus Hall 1859
†Strophostylus unica Hall 1862
†Strophostylus wortheni Weller 1916
Invalid names: Helictostylus Knight 1934 [objective synonym]