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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 Helicoprion ： ウィキペディア英語版 Helicoprion ''Helicoprion'' is a long-lived genus of extinct, shark-like〔http://science.nbcnews.com/_news/2013/02/27/17118881-ancient-shark-relative-had-buzzsaw-mouth?lite〕 eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." ''Helicoprion'' first arose in the oceans of the early Permian〔(Page at Smithsonian National Museum of Natural History )〕 , survived the Permian–Triassic extinction event, and eventually became extinct during the Early Triassic, . The closest living relatives of ''Helicoprion'' (and other eugeneodontids) are the chimaeras. ==Palaeobiology== 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「Helicoprion」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.