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Yuanmousaurus
''Yuanmousaurus'' ("Yuanmou lizard") was a sauropod dinosaur from the Middle Jurassic period of China. It is known from incomplete remains, recovered in 2000 from the Zhanghe Formation in Yuanmou County in Yunnan Province. ''Yuanmousaurus'' was a relatively large sauropod and may have reached about 17 meters (56 ft) in length. It was a basal member of the Sauropoda, but its exact systematic position is unclear. A recent study placed ''Yuanmousaurus'' within the family Mamenchisauridae.〔 The only and type species was ''Yuanmousaurus jiangyiensis''.〔
==Description==
''Yuanmousaurus'' was estimated to be approximately 17 meters (56 ft) in length.〔 The skull is missing, while the neck is known only from a fragment of a posterior cervical vertebra. This fragment indicates elongated neck vertebrae, similar to those of mamenchidaurid sauropods, but unlike the much shorter neck vertebrae of the more basal ''Shunosaurus''.〔 From the trunk and tail, 9 dorsal, 3 sacral and 7 caudal vertebrae were found. While the shoulder- and pelvic girdle are missing with the exception of one ilium, the limbs are better known, including the humerus, ulna, radius, thigh bone, tibia, fibula, astragalus, and a claw from the hind foot.〔 The forelimbs were proportionally longer than in the shortnecked ''Shunosaurus'', but shorter than in ''Omeisaurus'': the length ratio between humerus and thigh bone was 0.72 in ''Yuanmousaurus'', while it was 0.56 in ''Shunosaurus'' and 0.80 in ''Omeisaurus''.〔
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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