Mammalia - Artiodactyla - Protoceratidae

Full reference: E. Douglass. 1903. New vertebrates from the Montana Tertiary. Annals of Carnegie Museum 2(5):145-199

Parent taxon: Protoceratidae according to D. R. Prothero 1998

Sister taxa: Heteromeryx, Leptoreodon, Leptotragulus, Poabromylus, Protoceratinae, Pseudoprotoceras, Synthetoceratinae, Toromeryx

Subtaxa: Trigenicus profectus

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Type: Trigenicus socialis

Ecology: ground dwelling browser