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Urtinotherium
''Urtinotherium'' (meaning "Urtyn beast") is an extinct genus of indricothere hyracodontid mammals. It was a large animal that was closely related to ''Paraceratherium'', and found in rocks dating from the Late Eocene period. The remains were first discovered in the Urtyn Obo region in Inner Mongolia, which the name ''Urtinotherium'' is based upon. Other referred specimens are from northern China.〔
==Description==
''Urtinotherium'' was a representative of the large subfamily Indricotheriinae, and almost reached the proportions of ''Paraceratherium''. It is known from several findings in central and eastern Asia, though no complete skeletons are known. The holotype fossil (catalog number IVPP V.2769) includes a complete lower jaw in length, comparable to the smallest known of ''Paraceratherium''. The jaw is wedge shaped, very low in height, and with elongated branches. The symphysis was solid and extended to the beginning of the second premolars. The jaws dentition is complete, having three front incisors and canine. The first two incisors protrude forward with a crown length of , with forms similar to daggers. The other incisors and canines had much smaller crowns. Between each tooth is a small space, similar to its phylogenetically primitive relatives such as ''Juxia''. Its back teeth, which are separated from the front teeth by a small diastema, consist of four premolars and three molars. These are similar in structure to those of ''Paraceratherium'', with small premolars and larger molars. The latter have low coronas (are brachyodont) and had few enamel folds.〔
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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