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Houndsharks, Triakidae, are a family of ground sharks, consisting of about 40 species in 9 genera. In some classifications, the family is split into two subfamilies, with ''Mustelus'', ''Scylliogaleus'', and ''Triakis'' in the subfamily Triakinae, and the remaining genera in the subfamily Galeorhininae. Houndsharks are distinguished by possessing two large spineless dorsal fins, an anal fin, and oval eyes with nictitating eyelids. They are small to medium in size, ranging from in adult length. They are found throughout the world in warm and temperate waters, where they feed on fish and invertebrates on the seabed and in midwater. ==Genera== * ''Furgaleus'' Whitley, 1951 (Whiskery shark) * ''Galeorhinus'' Blainville, 1816 (School shark) * ''Gogolia'' Compagno, 1973 (Sailback houndshark) * ''Hemitriakis'' Herre, 1923 * ''Hypogaleus'' J. L. B. Smith, 1957 (Blacktip tope) * ''Iago'' Compagno & Springer, 1971 * ''Mustelus'' H. F. Linck, 1790 (Smooth-hound) * ''Scylliogaleus'' Boulenger, 1902 * ''Triakis'' J. P. Müller & Henle, 1839 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「houndshark」の詳細全文を読む スポンサード リンク
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