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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 Arctotraversodon ： ウィキペディア英語版 Arctotraversodon ''Arctotraversodon'' is a genus of traversodontid cynodont from the Late Triassic of Canada. Fossils first described from the Wolfville Formation in Nova Scotia in 1984 represented the first known traversodontid from North America.〔Hopson, J.A. (1984). Late Triassic traversodont cynodonts from Nova Scotia and southern Africa. ''Palaeontologia Africana'' Vol. 25; 181-201.〕 The type and only species is ''A. plemmyridon'', represented by teeth and several dentary bones. ==Description and history== ''Arctotraversodon'' was first tentatively placed in the genus ''Scalenodontoides'' as a new species, ?''Scalenodontoides plemmyridon''. Only dentary bones and a few teeth were known when it was first named. Postcanine teeth, the primary diagnostic material of most traversodontids, were not known for ?''S. plemmyridon''. Few available features could diagnose ?''S. plemmyridon'' as its own species, but the bones and teeth were clearly different than those of other traversodontids. A traversodontid postcanine tooth was later found from the same formation that was distinct from those of all other species. Unlike other traversodontid lower postcanines which have two cusps on either side of their crowns, these teeth had three cusps. The traversodontid ''Boreogomphodon'' from the Turkey Branch Formation of Virginia was later found to have three cusps on its lower postcanines, showing that North American traversodontids were distinct from those in Africa and South America. The species was assigned to its own genus, ''Arctotraversodon'', in 1992. ''Arctotraversodon'' means "northern ''Traversodon''" in reference to its northern location and close relation with ''Traversodon''. "Arcto" (from the Greek ''arktos'') can also mean "bear", as the holotype specimen was once informally called the "bear jaw." Features of an upper postcanine tooth that was found on a sea cliff in Nova Scotia were used to diagnose the new genus.〔 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「Arctotraversodon」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.