The Protoceratinae (Mammalia, Tylopoda, Protoceratidae) and the systematics of the Protoceratidae. Bulletin of the AMNH ; v. 150, article 4

Abstract

"The systematics of the subfamily Protoceratinae are revised and its evolution, phylogeny, and zoogeography outlined. The stratigraphic range of the subfamily extends from the Chadronian (early Oligocene) to the Clarendonian (middle Pliocene); geographically, the subfamily ranges from the northern Great Plains (South Dakota, Nebraska, Wyoming) southward to Texas and into Panama. The Protoceratinae now include four genera: Heteromeryx, Pseudoprotoceras, Protoceras, and Paratoceras. Calops Marsh is here synonymized with Protoceras; specific synonymies within each genus are also treated. Two new species of Protoceras are recognized: P. skinneri from South Dakota and Nebraska and P. neatodelpha from Wyoming. New skull and horn material allows an expanded description and diagnosis of Paratoceras, and a new species, P. wardi, from the Barstovian of the Texas Gulf Coastal Plain is erected"--P. 351.