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The butterfly rays are a group of rays forming the genus ''Gymnura'' and the family Gymnuridae. They are found in warm oceans worldwide, and occasionally in estuaries. The body of butterfly rays is flattened and surrounded by an extremely broad disc formed by the pectoral fins, which merge in front of the head. They have a very short, thread-like, tail. They range from to in body length. McEachran ''et al.'' place the butterfly rays in the subfamily Gymnurinae of the family Dasyatidae, but this article follows FishBase and ITIS in treating them as a family. ==Species== * ''Gymnura afuerae'' (Hildebrand, 1946) () * ''Gymnura altavela'' (Linnaeus, 1758) – Spiny butterfly ray () * ''Gymnura australis'' (E. P. Ramsay & Ogilby, 1886) – Australian butterfly ray () * ''Gymnura bimaculata'' (Norman, 1925) – Twin-spot butterfly ray () * ''Gymnura crebripunctata'' (W. K. H. Peters, 1869) – Longsnout butterfly ray () * ''Gymnura crooki'' Fowler, 1934 () * ''Gymnura hirundo'' (R. T. Lowe, 1843) – Madeira butterfly ray () * ''Gymnura japonica'' (Temminck & Schlegel, 1850) – Japanese butterfly ray () * ''Gymnura marmorata'' (J. G. Cooper, 1864) – California butterfly ray () * ''Gymnura micrura'' (Bloch & J. G. Schneider, 1801) – Smooth butterfly ray () * ''Gymnura natalensis'' (Gilchrist & W. W. Thompson, 1911) – Backwater butterfly ray () * ''Gymnura poecilura'' (G. Shaw, 1804) – Longtail butterfly ray () * ''Gymnura tentaculata'' J. P. Müller & Henle, 1841 – Tentacled butterfly ray () * ''Gymnura zonura'' Bleeker, 1852 – Zonetail butterfly ray () 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「butterfly ray」の詳細全文を読む スポンサード リンク
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