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| regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | superordo = Selachimorpha | ordo = Carcharhiniformes | ordo_authority = Compagno, 1977 }} The ground sharks, order Carcharhiniformes, are the largest order of sharks. With over 270 species, carcharhiniforms include a number of common types, such as catsharks, swellsharks, and the sandbar shark. Members of this order are characterized by the presence of a nictitating membrane over the eye, two dorsal fins, an anal fin, and five gill slits. The families in the order Carcharhiniformes are expected to be revised; recent DNA studies show that some of the conventional groups are not monophyletic. ==Families== According to FishBase, the eight families of ground sharks are:〔(Fish Identification: Ground sharks ) ''FishBase''. Retrieved 28 March 2013.〕 * Carcharhinidae (Requiem sharks) * Hemigaleidae (Weasel sharks) * Leptochariidae (Barbeled houndshark) * Proscylliidae (Finback catsharks) * Pseudotriakidae (False catsharks) * Scyliorhinidae (Catsharks) * Sphyrnidae (Hammerhead sharks) * Triakidae (Houndsharks) 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「Carcharhiniformes」の詳細全文を読む スポンサード リンク
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