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Hippotherium : ウィキペディア英語版 | Hippotherium
''Hippotherium'' is an extinct genus of horse endemic to North America, to Asia, Europe, and Africa during the Miocene through Pliocene ~13.65—3.3 Mya, existing for . == Taxonomy == ''Hippotherium'' was named by Kaup in 1832 and assigned to Equidae by Kaup 1833. It was named as a subgenus of Equus; type ''European E. gracilis''. Its type is ''Equus primigenius''. It was synonymized subjectively with Hipparion by MacFadden (1998) and Pesquero et al. (2006). It was assigned to the tribe Hipparionini by Alroy in 2002 and 2008.〔B. J. MacFadden. 1998. Equidae. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America 1:537-559〕〔J. Alroy. 2008. Synonymies, reidentifications, and other arbitrary pronouncements mostly concerning fossil vertebrates.〕 It was synonymized subjectively with Cormohipparion occidentale by MacFadden (1984) and was considered a nomen dubium by Macdonald (1992).〔B. J. MacFadden. 1984. Systematics and phylogeny of Hipparion, Neohipparion, Nannippus, and Cormohipparion (Mammalia, Equidae) from the Miocene and Pliocene of the New World. Bulletin of the American Museum of Natural History 179(1):1-195〕〔J. R. Macdonald. 1992. An analysis of the types of 147 named horse species and subspecies. Dakoterra 4:44-48〕
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