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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 Dimetrodon borealis ： ウィキペディア英語版 Dimetrodon borealis ''Dimetrodon borealis'', formerly known〔http://www.utm.utoronto.ca/main-news/canuckosaur-first-canadian-dinosaur-becomes-dimetrodon-borealis/ref〕 as ''Bathygnathus borealis,'' is an extinct species of pelycosaur-grade synapsid that lived about 270 million years ago (Ma) in the Early Permian. A partial maxilla or upper jaw bone from Prince Edward Island in Canada is the only known fossil of ''Bathygnathus''. The maxilla was discovered around 1845 during the course of a well excavation in Spring Brook in the New London area and its significance was recognized by geologists John William Dawson and Joseph Leidy. It was originally described by Leidy in 1854 as the lower jaw of a dinosaur, making it the first purported dinosaur to have been found in Canada, and the second to have been found in all of North America (the first was ''Clepsysaurus'' from Pennsylvania, now known to be a phytosaur rather than a dinosaur). The bone was later identified as that of a pelycosaur. Although its current classification as a sphenacodontid synapsid was not recognized until after the discovery of its more famous relative ''Dimetrodon ''in the 1870s, ''Bathygnathus ''is notable for being the first discovered sphenacodont. A 2015 study by the researchers from U of T Mississauga, Carleton University and the Royal Ontario Museum reclassified the species into the genus ''Dimetrodon''.〔http://phys.org/news/2015-11-canuckosaur-canadian-dinosaur-dimetrodon-borealis.html〕 ==Description== The teeth of ''Bathygnathus'' are long, recurved, and distinctively teardrop-shaped, being widest at the middle rather than the base. The teardrop shape of the teeth is an indication that ''Bathygnathus'' belongs to the family Sphenacodontidae. The shape of the maxilla indicates that ''Bathygnathus'' had a deep skull like those of other advanced sphenacodontids like ''Dimetrodon''. Like ''Dimetrodon'', ''Bathygnathus'' has an enlarged caniniform tooth near the front of the jaw. 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「Dimetrodon borealis」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.