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''Urolophus'' is a genus of round rays mostly native to the western Pacific Ocean and the Indian Ocean, though one species occurs in the Pacific waters of the Mexican coast. Müller and Henle erected ''Urolophus'' in an 1837 issue of ''Bericht Akademie der Wissenschaften zu Berlin''. The name is derived from the Greek ''oura'', meaning "tail", and ''lophos'', meaning "crest". In ''Urolophus'', the outer rims of the nostrils are not enlarged into lobes, but may form a small knob at the back. ''Raia'' (''Leiobatus'') Blainville, 1816 is a synonym of ''Urolophus''; though his account was published earlier, none of species Blainville listed for ''Leiobatus'' had descriptions, thus rendering them invalid.〔Eschmeyer, W.N. (ed.) (Catalog of Fishes electronic version ) (26 August 2010).〕 ''Urolophus'' fossils have been recovered dating back to the Eocene epoch (''c''. 56–34 Ma).〔 ==Species== There are currently 22 recognized species in this genus: * ''Urolophus armatus'' J. P. Müller & Henle, 1841 (New Ireland stingaree) * ''Urolophus aurantiacus'' J. P. Müller & Henle, 1841 (Sepia stingray) * ''Urolophus bucculentus'' W. J. Macleay, 1884 (Sandyback stingaree) * ''Urolophus circularis'' McKay, 1966 (Circular stingaree) * ''Urolophus cruciatus'' Lacépède, 1804 (Crossback stingaree) * ''Urolophus deforgesi'' Séret & Last, 2003 (Chesterfield Island stingaree) * ''Urolophus expansus'' McCulloch, 1916 (Wide stingaree) * ''Urolophus flavomosaicus'' Last & M. F. Gomon, 1987 (Patchwork stingaree) * ''Urolophus gigas'' T. D. Scott, 1954 (Spotted stingaree) * ''Urolophus javanicus'' E. von Martens, 1864 (Java stingaree) * ''Urolophus kaianus'' Günther, 1880 (Kai stingaree) * ''Urolophus kapalensis'' Yearsley & Last, 2006 (Kapala stingaree) * ''Urolophus lobatus'' McKay, 1966 (Lobed stingaree) * ''Urolophus mitosis'' Last & M. F. Gomon, 1987 (Mitotic stingaree) * ''Urolophus neocaledoniensis'' Séret & Last, 2003 (New Caledonian stingaree) * ''Urolophus orarius'' Last & M. F. Gomon, 1987 (Coastal stingaree) * ''Urolophus papilio'' Séret & Last, 2003 (Butterfly stingaree) * ''Urolophus paucimaculatus'' J. M. Dixon, 1969 (Sparsely-spotted stingaree) * ''Urolophus piperatus'' Séret & Last, 2003 (Coral Sea stingaree) * ''Urolophus sufflavus'' Whitley, 1929 (Yellowback stingaree) * ''Urolophus viridis'' McCulloch, 1916 (Greenback stingaree) * ''Urolophus westraliensis'' Last & M. F. Gomon, 1987 (Brown stingaree) 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「Urolophus」の詳細全文を読む スポンサード リンク
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