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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 Tasmanian numbfish ： ウィキペディア英語版 Tasmanian numbfish The Tasmanian numbfish (''Narcine tasmaniensis'') is a species of electric ray in the family Narcinidae. Endemic to southeastern Australia, this common ray inhabits shallow continental shelf waters in the southern portion of its range and deeper continental slope waters in the northern portion of its range. It prefers sand and mud habitats. This species can be identified by its spade-shaped pectoral fin disc with concave anterior margins, long tail with well-developed skin folds along either side, and plain dark brown dorsal colouration. Its maximum known length is . Bottom-dwelling and sedentary, the Tasmanian numbfish feeds mainly on polychaete worms and crustaceans. As in all numbfishes, it can produce a moderate electric shock to defend itself against predators. This species gives live birth, with the unborn young sustained to term by yolk; the litter size ranges from one to eight. The Tasmanian numbfish is a common bycatch of trawl fisheries. However, its population does not appear to be threatened by human activity and it has been assessed as Least Concern by the International Union for Conservation of Nature (IUCN). ==Taxonomy and phylogeny== Scottish naturalist John Richardson described the Tasmanian numbfish in an 1841 contribution to ''Proceedings of the Zoological Society of London''. Classifying the new species in the genus ''Narcine'', he gave it the specific epithet ''tasmaniensis'' as the holotype, a female long, was collected from Port Arthur, Tasmania.〔〔 Richardson noted that the ray was known locally as "ground shark".〔 Other common names for this species include electric ray, electric torpedo, little numbfish, and numbfish.〔 In a 2012 phylogenetic study based on mitochondrial DNA, ''Narcine'' was found to be polyphyletic, with the Tasmanian numbfish belonging to a different lineage than the giant electric ray (''N. entemedor'').〔 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「Tasmanian numbfish」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.