Mammalia - Artiodactyla - Protoceratidae

Synonym: Calops Marsh 1894

Full reference: O. C. Marsh. 1891. A horned artiodactyle (Protoceras celer) from the Miocene. The American Journal of Science and Arts, series 3 41(241):81-82

Parent taxon: Protoceratinae according to D. R. Prothero and J. A. Ludtke 2007

Sister taxon: Paratoceras

Subtaxa: Protoceras celer, Protoceras neatodelpha, Protoceras skinneri

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Ecology: ground dwelling browser