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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 Sparsely-spotted stingaree ： ウィキペディア英語版 Sparsely-spotted stingaree The sparsely-spotted stingaree, white-spotted stingaree, or Dixon's stingaree (''Urolophus paucimaculatus'') is a species of stingray in the family Urolophidae, common off the southern Australian coast. Preferring sandy flats and seagrass beds, this benthic ray can be found from close to shore to a depth of at least ,〔 and tends to occur deeper in the northern portion of its range. Reaching a length of , this species has a broad, diamond-shaped pectoral fin disc that is typically plain gray in color above with a V-shaped marking between the eyes. Individuals from southerly waters also generally exhibit a smattering of small, dark-edged white spots. This ray is further characterized by a distinctively bell-shaped curtain of skin between the nostrils. Its tail has a skin fold running along either side and a leaf-shaped caudal fin, but no dorsal fin. Relatively inactive during daytime, the sparsely-spotted stingaree preys mainly on crustaceans, and to a much lesser extent on polychaete worms and other small benthic organisms. It is aplacental viviparous, with the mother provisioning her young with histotroph ("uterine milk"). Life history differs between the eastern and western subpopulations: eastern females bear litters of up to six pups with a twelve-month gestation period, while western females bear litters of only one or two pups with a ten-month gestation period. Also, western rays mature later and live longer than eastern rays. The venomous sting of the sparsely-spotted stingaree is potentially injurious to humans, and it has been reported to react aggressively if disturbed. The International Union for Conservation of Nature (IUCN) has listed it under Least Concern, as there is little fishing activity over the majority of its range. ==Taxonomy== The sparsely-spotted stingaree was described in a 1969 issue of ''The Victorian Naturalist'' by Joan Dixon of the Museum Victoria. The specific epithet ''paucimaculatus'' is derived from the Latin ''paucus'', meaning "few", and ''maculatus'', meaning "spotted". The type specimen was collected from the Bass Strait, near Cape Patton in Victoria. Subpopulations from the eastern and western portions of its range differ in aspects of life history and merit further taxonomic investigation, according to the International Union for Conservation of Nature (IUCN).〔 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「Sparsely-spotted stingaree」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.