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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Eubrachiosaurus ： ウィキペディア英語版 Eubrachiosaurus ''Eubrachiosaurus'' is an extinct genus of stahleckeriine stahleckeriid dicynodont known from the Late Triassic (Norian stage) of Wyoming, USA. ''Eubrachiosaurus'' is known only from the holotype specimen FMNH UC 633, a partial left scapula as well as a left humerus, and left pelvis which have been lost. It was collected at the Little Popo Agie River, near Lander, Fremont County from the Popo Agie Formation of the Chugwater Group. ''Eubrachiosaurus browni'' was first described and named by Samuel Wendell Williston in 1904 along with ''Brachybrachium brevipes''. Lucas and Hunt (1993) considered both taxa junior synonyms of ''Placerias hesternus'', which is known from the same formation, a position maintained in most subsequent studies. The synonymy of ''Eubrachiosaurus'' and ''Placerias'' was questioned by Long and Murry (1995) who noted that the ectepicondyle of ''Eubrachiosaurus'' was enlarged as in ''Ischigualastia''. All of Williston's dicynodont material from Popo Agie has been lost, apart from the partial left scapula of ''Eubrachiosaurus''. Kammerer ''et al.'' (2013) redescribed the available material and the missing elements were redescribed from photographs taken by Williston (1904), and suggested that ''Eubrachiosaurus'' is a valid member of the Stahleckeriinae, most closely related to ''Sangusaurus''.〔 Kammerer ''et al.'' (2013) also noted that Williston (1904) described ''Brachybrachium'' on the basis of a fragmentary humerus from the upper Popo Agie beds, in "almost identically the same horizon" as ''Eubrachiosaurus''. The currently lost specimen was poorly preserved with much of the proximal and distal ends missing. It shares with the humerus of ''Eubrachiosaurus'' a nearly perpendicular angle between the edges of the deltopectoral crest. Furthermore, the traits on which basis Williston used to distinguish the two taxa are either known to vary intraspecifically in kannemeyeriiforms or were too badly preserved in ''Brachybrachium'' to display clear morphological differences from ''Eubrachiosaurus''. Thus, Kammerer ''et al.'' (2013) concluded the it is probable that these two taxa are synonymous, but noted that on a strict apomorphy basis ''Brachybrachium brevipes'' must be considered a ''nomen dubium''.〔 ==References== 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「Eubrachiosaurus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.