Classification of the genus Spirogmoceras
G. †Spirogmoceras Silberling 1956
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†Spirogmoceras shastense Smith 1904
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Invalid names: Trachyceras (Protrachyceras) beckeri Smith 1927 [synonym], Trachyceras (Protrachyceras) californicum Smith 1927 [synonym], Trachyceras (Protrachyceras) lecontei Hyatt and Smith 1905 [synonym], Trachyceras (Protrachyceras) lindgreni Smith 1927 [synonym], Trachyceras (Protrachyceras) madisonense Smith 1927 [synonym]