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Protoceras
''Protoceras'' ('first horns') is an extinct genus of Artiodactyla, of the family Protoceratidae, endemic to North America from the Oligocene through Miocene (Orellan to Harrisonian stage) 33.9—20.6 Ma, existing for approximately .〔(PaleoBiology Database: ''Protoceras'', basic info )〕 ==Taxonomy==
Protoceras was named by Marsh (1891). Its type is ''Protoceras celer''. It is the genus of Protoceratidae and subfamily Protoceratinae. It was assigned to Protoceratidae by Marsh (1891) and Carroll (1988); and to Protoceratinae by Matthew (1908), Webb (1981), Prothero (1998), Webb et al. (2003) and Prothero and Ludtke (2007).〔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〕〔R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698〕〔W. D. Matthew. 1908. Osteology of Blastomeryx and phylogeny of the American Cervidae. Bulletin of the American Museum of Natural History 24(27):535-562〕〔S. D. Webb. 1981. Journal of Vertebrate Paleontology 1(3-4)〕〔D. R. Prothero and J. A. Ludtke. 2007. Family Protoceratidae. in D. R. Prothero and S. Foss (eds.), The Evolution of Artiodactyls 169-176〕
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