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Sharks belong to the superorder Selachimorpha in the subclass Elasmobranchii, in the class Chondrichthyes. The Elasmobranchii also include rays and skates; the Chondrichthyes also include Chimaeras. The first sharks appeared in the oceans 440 million years ago. Listed below are extant species of shark. Sharks are spread across 511 described species in eight orders. The families and genera within the orders are listed in alphabetical order. ==Cow and frilled sharks== * ORDER HEXANCHIFORMES * * Family Chlamydoselachidae (Frilled sharks) * * * Genus ''Chlamydoselachus'' Garman, 1884 * * * * ''Chlamydoselachus africana'' Ebert & L. J. V. Compagno, 2009 (African frilled shark) * * * * ''Chlamydoselachus anguineus'' Garman, 1884 (Frilled shark) * * Family Hexanchidae (Cow sharks) * * * Genus ''Heptranchias'' Rafinesque, 1810 * * * * ''Heptranchias perlo'' (Bonnaterre, 1788) (Sharpnose sevengill shark) * * * Genus ''Hexanchus'' Rafinesque, 1810 * * * * ''Hexanchus griseus '' (Bonnaterre, 1788) (Bluntnose sixgill shark) * * * * ''Hexanchus nakamurai'' Teng, 1962 (Bigeyed sixgill shark) * * * Genus ''Notorynchus'' Ayres, 1855 * * * * ''Notorynchus cepedianus'' (Péron, 1807) (Broadnose sevengill shark) 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「List of sharks」の詳細全文を読む スポンサード リンク
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