翻訳と辞書 Words near each other ・ Borena Zone ・ Borenium ion ・ Borenius & Kemppinen ・ Borenore Caves ・ Borenore railway station ・ Borenore, New South Wales ・ Borens IK ・ Borensberg ・ Boreocanthon ・ Boreocingula ・ Boreocingula castanea ・ Boreocingula globulus ・ Boreocingula martyni ・ Boreoeutheria ・ Boreogadus saida ・ Boreogomphodon ・ Boreoheptagyia ・ Boreohesperus ・ Boreoiulus ・ Boreoiulus dollfusi ・ Boreolepis ・ Boreolestes ・ Boreolestes likharevi ・ Boreolestes sylvestris ・ Boreopelta ・ Boreopteridae ・ Boreopterus ・ Boreosmittia ・ Boreosomus ・ Boreosphenida Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Boreogomphodon ： ウィキペディア英語版 Boreogomphodon ''Boreogomphodon'' is a genus of traversodontid cynodont from the Late Triassic of the eastern United States. Fossils have been found from the Turkey Branch Formation in Virginia. ==Description and history== ''Boreogomphodon jeffersoni'' was named in 1990. Its teeth and cranial bones are the most common tetrapod fossils in the Turkey Branch Formation. ''Boreogomphodon'' was distinguished from other traversodontids like the African ''Luangwa'' and the South American ''Traversodon'' on the basis of its postcanine teeth. Most traversodontids have lower postcanine teeth with two cusps, but ''Boreogomphodon'' was the first traversodontid found with three cusps on its lower postcanine teeth. There is a single cusp on the side of the upper postcanine facing the lip, while a flat surface extends outward from it. The traversodontid ''Arctotraversodon'' from the Wolfville Formation of Nova Scotia is similar to ''Boreogomphodon'' in that it has three cusps on its lower postcanine, but its postcanines are much wider than they are long relative to those of ''Boreogomphodon''. ''Boreogomphodon'' specimens likely represent juvenile individuals because of their small size. The snout is short, while larger, presumably mature traversodonts have longer snouts. ''Boreogomphodon'' specimens have only four or five postcanine teeth. Traversodontids acquire more of these teeth as they grow, suggesting that ''Boreogomphodon'' individuals were not fully mature. ''Boreogomphodon'' also has some sectorial, or cutting, postcanine teeth, which are not present in most larger traversodontids.〔 ''Boreogomphodon'' has several primitive features, including a depression in the upper jaw called the paracanine fossa in front of the canine tooth. This fossa provides space for the lower canine tooth when the jaw is closed. Above the upper canine at the top of the snout there is a small depression on the maxilla. The tip of the snout is covered in irregular pits, a unique feature of ''Boreogomphodon''. Each upper postcanine has large central cusp and a posterior cingulum. 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「Boreogomphodon」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.