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Olbitherium
''Olbitherium'' is an extinct mammal of the order Perissodactyla (an early ancestor of modern-day horses, rhinos, and tapirs) from the early Eocene epoch of Shangdong, China.
==Description and Classification==
''Olbitherium'' was originally described from lower and upper jaw fragments and several teeth found in the Wutu Formation of Shangdong Province.〔 The limited material of ''Olbitherium'' shares similarities with several ungulate groups. According to Tong ''et al.'', the upper cheek teeth show similarities to early Perissodactyls, as well as the hyracoid ''Seggeurius'', while the lower cheek teeth more closely resemble those of phenacodontids, such as ''Ectocion'', ''Phenacodus'', and ''Copecion''. Due to these conflicting similarities, Tong ''et al.'' placed ''Olbitherium'' as ''incertae sedis'' within the Phenacodonta, a grouping of Perissodactyla, "Condylarthra", and Hyracoidea in McKenna's 1975 classification, and suggested that ''Olbitherium'' represents an intermediate stage in the evolution of perissodactlys from ''Phenacodus''-like ancestors.
〔 In 2010, a skull and post-cranial remains were described, and ''Olbitherium'' was assigned to the Perissodactyla, closely related to basal members of the extinct family Isectolophidae such as ''Homogalax'' and ''Cardiolophus''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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