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''Miohippus'' (meaning "small horse") was a genus of prehistoric horse existing longer than most Equidae. ''Miohippus'' lived in what is now North America during the Oligocene approximately 32-25 million years ago. While descending genera of this species lived during the Miocene period, ''Miohippus'' was a horse of the Oligocene. According to the Florida Museum of Natural History, Othniel Charles Marsh first believed ''Miohippus'' lived during the Miocene and thus named the genus using this incorrect conclusion. More recent research provides evidence that ''Miohippus'' actually lived during the Oligocene. ''Miochippus'' species are commonly referred to as the three-toed horses. Their range was from Alberta, Canada to Florida to California. ==Taxonomy== ''Miohippus'' was named by Marsh in 1874 and its type is ''Miohippus annectens''. It was assigned to Equidae by Marsh in 1874. It was synonymized subjectively with ''Mesohippus'' by Matthew in 1899. It was assigned again by Hay (1902), H. F. Osborn in 1918,〔H. F. Osborn. 1918. Geological Society America Bulletin 29.〕 Hay (1930), Stirton (1940) and Carroll (1988); and to Anchitheriinae by MacFadden in 1998.〔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.〕〔(Paleobiology Database ''Miohippus'' entry ) Accessed 8 December 2011〕 * ''Miohippus'' Marsh, 1874 (synonyms- ''Altippus'' Douglass, 1908, ''Pediohippus'' Schlaikjer, 1935) : * ''M. acutidens'' (Sinclair, 1905) : * ''M. anceps'' (Marsh, 1874) : * ''M. annectens'' Marsh, 1874 Type species (synonyms- ''M. crassicuspis'' Osborn, 1904)'' : * ''M. assiniboiensis'' (Lambe, 1905) : * ''M. condoni'' (Leidy, 1870) : * ''M. equiceps'' (Cope, 1879) (synonyms- ''Anchitherium brachylophus'' Cope, 1879) : * ''M. equinanus'' Osborn, 1918 : * ''M. gemmarosae'' Osborn, 1918 : * ''M. gidleyi'' (Osborn, 1904) (synonyms- ''Mesohippus grallipes'' Sinclair, 1925, ''Me. validus'' Osborn, 1894) : * ''M. grandis'' (Clark & Beerbower, 1967) : * ''M. intermedius'' (Osborn & Wortman, 1895) : * ''M. longicristis'' (Cope, 1878) : * ''M. obliquidens'' (Osborn, 1904) (synonyms- ''Me. barbouri'' Schlaikjer, 1931, ''Me. brachystylus'' Osborn, 1904, ''Me. eulophus'' Osborn, 1904, ''Mi. meteulophus'' Osborn, 1904, ''Pediohippus antiquus'' Schlaikjer, 1935) : * ''M. primus'' Osborn, 1918 : * ''M. quartus'' Osborn, 1918 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Miohippus」の詳細全文を読む スポンサード リンク
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