Mammalia - Artiodactyla - Protoceratidae

Full reference: H. J. Cook. 1934. New artiodactyls from the Oligocene and Lower Miocene of Nebraska. American Midland Naturalist 15(2):148-165

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

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

Subtaxa: Pseudoprotoceras longinaris, Pseudoprotoceras minor, Pseudoprotoceras semicinctus, Pseudoprotoceras taylori

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Type: Pseudoprotoceras longinaris

Ecology: ground dwelling browser