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Uintaceras is an extinct genus of medium-sized early that lived in North America (Wyoming and Utah) during the Middle Eocene, with only the type species U. radinskyi, named in 1997, currently contained within the genus.L. T. Holbrook and S. G. Lucas. 1997. A New Genus of Rhinocerotoid from the Eocene of Utah and the Status of North American " Forstercooperia". Journal of Vertebrate Paleontology 17(2):384-396 Traditionally considered the oldest and most primitive species of the Rhinocerotidae, it may instead have been a close relative of the Asia Paraceratheriidae. The dubious species Forstercooperia ( Hyrachyus) grandis (Radinsky, 1967; Peterson, 1919)Peterson, O.A. (1919). "Report upon the Material Discovered in the Upper Eocene of the Uinta Basin by Earl Douglass in the years 1908-1909, and by 0. A. Peterson in 1912". Annals of the Carnegie Museum. pp. 40–168. is also possibly the same animal as Uintaceras, although the Asian material of F. grandis was assignable to Forstercooperia confluens.
Uintaceras weighed about when fully grown. It was a relatively slender animal and Uintaceras resembled a typical hyracodontidae (e.g. Hyracodon), but differed from the hyracodonts due to the presence of a primitive four-fingered hand and a number of other features of the structure of the legs, which were clearly not intended for fast and long running.
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