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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 Hexanchiformes ： ウィキペディア英語版 Hexanchiformes Hexanchiformes is the order consisting of the most primitive types of sharks, and numbering just six extant species. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens.〔Allen, 45〕 Hexanchiform sharks have only one dorsal fin, either six or seven gill slits, and no nictitating membrane in the eyes. The frilled shark, ''Chlamydoselachus anguineus'', is very different from the cow sharks, and it has been proposed that it be moved to its own order, Chlamydoselachiformes. ==Classification== 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「Hexanchiformes」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.