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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Australian weasel shark ： ウィキペディア英語版 Australian weasel shark The Australian weasel shark (''Hemigaleus australiensis'') is an uncommon species of ground shark in the family Hemigaleidae. It inhabits shallow waters off northern Australia to a depth of ; smaller sharks frequent sand and seagrass habitat and shift to coral reefs as they grow older. A slim, drab species reaching a length of , it has sickle-shaped fins with dark tips on the second dorsal fin and caudal fin upper lobe. Its upper teeth are broad with strong serrations only on the trailing edge. The lateral line along each side is prominent and exhibits a downward curve below the second dorsal fin. Feeding almost exclusively on octopuses and other cephalopods, the Australian weasel shark mostly hunts near the sea floor. It is viviparous, with the developing embryos nourished through a placental connection and born after a six-month gestation period. This species is productive for a shark, with females bearing litters of 1–19 pups usually twice per year. The Australian weasel shark is caught by trawl and to a lesser extent gillnet and longline fisheries, though not in such numbers that its population is threatened. Thus, it has been listed as Least Concern by the International Union for Conservation of Nature (IUCN). ==Taxonomy== Originally regarded as conspecific with the sicklefin weasel shark (''H. microstoma''), the Australian weasel shark was first documented as a potentially distinct species by John Stevens and Glen Cuthbert in 1983.〔 Its scientific description was authored by William White, Peter Last, and Leonard Compagno in a 2005 volume of the scientific journal ''Zootaxa''. They gave it the specific epithet ''australiensis'' on the basis of its range, and designated as the type specimen an adult male long caught at a depth of off Geraldton, Western Australia.〔 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「Australian weasel shark」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.