Uintaceras

Uintaceras; Temporal range: Middle Eocene, 46.2–40.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Restoration
	Holotype jaw of the possible synonym Forstercooperia (Hyrachyus) grandis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Superfamily:	Rhinocerotoidea
Genus:	†Uintaceras; Holbrook & Lucas, 1997
Species:	†U. radinskyi
Binomial name
	†Uintaceras radinskyi; Holbrook & Lucas, 1997
Synonyms
	Forstercooperia grandis? Radinsky, 1967; Hyrachyus grande? Peterson, 1919; Hyrachyus grandis? (Peterson, 1919);

Uintaceras is an extinct genus of medium-sized early rhinocerotoids 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.^[1]^[2] Traditionally considered the oldest and most primitive species of the Rhinocerotidae, it may instead have been a close relative of the Asian Paraceratheriidae.^[3] The dubious species Forstercooperia (Hyrachyus) grandis (Radinsky, 1967; Peterson, 1919)^[4]^[5] is also possibly the same animal as Uintaceras,^[2]^[6] although the Asian material of F. grandis was assignable to Forstercooperia confluens.

Uintaceras weighed about 220 kilograms (490 lb) when fully grown.^{[citation needed]} It was a relatively slender animal and Uintaceras resembled a typical hyracodontid (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.^[6]

References

^ "Uintaceras Holbrook & Lucas, 1997". www.gbif.org. GBIF. Retrieved 2020-12-30.
^ ^a ^b 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
^ Wang, Haibing; Bai, Bin; Meng, Jin; Wang, Yuanqing (2016-12-21). "Earliest known unequivocal rhinocerotoid sheds new light on the origin of Giant Rhinos and phylogeny of early rhinocerotoids". Scientific Reports. 6 (1): 39607. doi:10.1038/srep39607. ISSN 2045-2322. PMC 5175171. PMID 28000789.
^ Radinsky, L.B. (1967). "A Review of the Rhinocerotoid Family Hyracodontidae (Perissodactyla)". Bulletin of the American Museum of Natural History. 136 (1): 1–46. hdl:2246/1987.
^ Peterson, O.A. (1919). "Report upon the Material Discovered in the Upper Eocene of the Uinta Basin by Earl Douglas in the years 1908-1909, and by 0. A. Peterson in 1912". Annals of the Carnegie Museum. pp. 40–168.
^ ^a ^b Prothero, D.R. (2005). The Evolution of North American Rhinoceroses. Cambridge University Press. pp. 1–218. ISBN 0-521-83240-3.

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[1] "Uintaceras Holbrook & Lucas, 1997". www.gbif.org. GBIF. Retrieved 2020-12-30.

[Holbrook1997-2] 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

[3] Wang, Haibing; Bai, Bin; Meng, Jin; Wang, Yuanqing (2016-12-21). "Earliest known unequivocal rhinocerotoid sheds new light on the origin of Giant Rhinos and phylogeny of early rhinocerotoids". Scientific Reports. 6 (1): 39607. doi:10.1038/srep39607. ISSN 2045-2322. PMC 5175171. PMID 28000789.

[4] Radinsky, L.B. (1967). "A Review of the Rhinocerotoid Family Hyracodontidae (Perissodactyla)". Bulletin of the American Museum of Natural History. 136 (1): 1–46. hdl:2246/1987.

[5] Peterson, O.A. (1919). "Report upon the Material Discovered in the Upper Eocene of the Uinta Basin by Earl Douglas in the years 1908-1909, and by 0. A. Peterson in 1912". Annals of the Carnegie Museum. pp. 40–168.

[prothero2005-6] Prothero, D.R. (2005). The Evolution of North American Rhinoceroses. Cambridge University Press. pp. 1–218. ISBN 0-521-83240-3.

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Uintaceras Temporal range: Middle Eocene, 46.2–40.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N

Restoration

Holotype jaw of the possible synonym Forstercooperia (Hyrachyus) grandis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Perissodactyla
Superfamily:	Rhinocerotoidea
Genus:	†Uintaceras Holbrook & Lucas, 1997
Species:	†U. radinskyi
Binomial name
†Uintaceras radinskyi Holbrook & Lucas, 1997
Synonyms
Forstercooperia grandis? Radinsky, 1967 Hyrachyus grande? Peterson, 1919 Hyrachyus grandis? (Peterson, 1919)