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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 Trirachodon ： ウィキペディア英語版 Trirachodon ''Trirachodon'' (Greek: "three ridge tooth") is an extinct genus of tritylodontoid cynodont. Fossils have been found from the Cynognathus Assemblage Zone of the Beaufort Group in South Africa, dating back to the Early and Middle Triassic.〔Rubidge, B.S. (ed.) 1995. ''Biostratigraphy of the Beaufort Group (Karoo Supergroup)''. 46 pp. Council for Geoscience, Pretoria.〕 ==Description== The skull of ''Trirachodon'' had a short, narrow snout with a wide orbital region. The zygomatic arches were relatively slender.〔Seeley, H. G. (1895). Researches on the structure, organization and classification of the fossil Reptilia. On Diademdon. ''Philosophical Transactions of the Royal Society of London B'' 185:1029–1041.〕〔Kemp, T. S. (1982). ''Mammal−like Reptiles and the Origin of Mammals''. 363 pp. Academic Press, London.〕 ''Trirachodon'' was quite small for a cynodont, growing no larger than 50 cm in length. It had noticeably less molariform teeth than its closely related contemporary ''Diademodon''. These teeth tended to be tranversely broader than ''Diademodon'' as well.〔Seeley, H. G. (1895). On the structure, organization and classification of the fossil Reptilia III. On Trirachodon. ''Philosophical Transactions of the Royal Society of London B'' 186:48–57.〕〔Crompton, A. W. and Ellenberger, F. (1957). On a new cynodont from Molteno Beds and origin of tritylodontids. ''Annals of the South African Museum'' 44:1–14.〕 A bony secondary palate and precise postcanine tooth occlusion are seen as derived characteristics in ''Trirachodon'' that are similar to those of mammals. 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「Trirachodon」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.