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Lower Miocene to present | image = Caribbean roughshark.jpg | image_caption = Caribbean roughshark, ''Oxynotus caribbaeus'' | image_width = 250px | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | ordo = Squaliformes | familia = Oxynotidae | familia_authority = T. N. Gill, 1912 | genus = ''Oxynotus'' | genus_authority = Rafinesque, 1810 | type_species = ''Oxynotus centrina'' | type_species_authority = Rafinesque, 1810 }} ''Oxynotus'' is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from in adult body length, depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. ==Species== * ''Oxynotus bruniensis'' Ogilby, 1893 (Prickly dogfish) * ''Oxynotus caribbaeus'' Cervigón, 1961 (Caribbean roughshark) * ''Oxynotus centrina'' Linnaeus, 1758 (Angular roughshark) * ''Oxynotus japonicus'' Ka. Yano & Murofushi, 1985 (Japanese roughshark) * ''Oxynotus paradoxus'' Frade, 1929 (Sailfin roughshark) 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「Oxynotus」の詳細全文を読む スポンサード リンク
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