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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 Riojasaurus ： ウィキペディア英語版 Riojasaurus ''Riojasaurus'' (meaning "Rioja lizard") was a herbivorous sauropodomorph dinosaur named after La Rioja Province in Argentina where it was found by José Bonaparte. It lived during the Late Triassic and grew to about long.〔"Riojasaurus." In: Dodson, Peter & Britt, Brooks & Carpenter, Kenneth & Forster, Catherine A. & Gillette, David D. & Norell, Mark A. & Olshevsky, George & Parrish, J. Michael & Weishampel, David B. ''The Age of Dinosaurs''. Publications International, LTD. p. 41. ISBN 0-7853-0443-6.〕 ''Riojasaurus'' is the only known riojasaurid to live in South America. ==Description== ''Riojasaurus'' had a heavy body, bulky legs, and a long neck and tail. Its leg bones were dense and massive for an early sauropodomorph.〔 By contrast, its vertebrae were lightened by hollow cavities, and unlike most early sauropodomorphs, ''Riojasaurus'' had four sacral vertebrae instead of three.〔 It probably moved slowly on all fours and was unable to rear up on its back legs.〔〔Van Heerden, J. and Galton, P.M. (1997). "The affinities of ''Melanorosaurus'' a Late Triassic prosauropod dinosaur from South Africa". ''Neues Jahrbuch für Geologie und Paläontologie Monatshefte''. (1):39-55〕 The nearly equal length of the fore and hindlimbs〔 is also suggestive of an obligatorily quadrupedal gait. No skull was found with the first skeleton of ''Riojasaurus'',〔Bonaparte, J.F. (1967). Dos nuevas "faunas" de reptiles triásicos de Argentina. ''Ameghiniana'' 10(1): 89-102.〕 although a well-preserved skull attributed to ''Riojasaurus'' was found later.〔Bonaparte, J.F. & Pumares, J.A. (1995). Notas sobre el primer craneo de ''Riojasaurus incertus'' (Dinosauria, Prosauropoda, Melanorosauridae) del Triasico Superios de La Rioja, Argentina. ''Ameghiniana'' 32(4): 341-349.〕 The teeth of ''Riojasaurus'' were leaf shaped and serrated. The upper jaw contained 5 teeth at the front, with 24 more behind them in a row that ended under the eyes. Comparisons between the scleral rings of ''Riojasaurus'' and modern birds and reptiles suggest that it may have been cathemeral, active throughout the day at short intervals. 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「Riojasaurus」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.