Classification of the genus Stemmatias
G. †Stemmatias Hay 1899
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†Stemmatias bicristatus St John and Worthen 1875
†Stemmatias bifurcatus St John and Worthen 1875
†Stemmatias cheiriformis St John and Worthen 1875
†Stemmatias compactus St John and Worthen 1875
†Stemmatias keokuk St John and Worthen 1875
†Stemmatias simplex St John and Worthen 1875
†Stemmatias symmetricus St John and Worthen 1875
Invalid names: Gunnellodus Wilimovksy 1954 [synonym], Stemmatodus St John and Worthen 1875 [replaced]