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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 Velvet water bug ： ウィキペディア英語版 Velvet water bug Velvet water bugs are members of the family Hebridae. They are semiaquatic insects that live among moss or ponds with an abundance of vegetation, in which they prey on small arthropods. Velvet water bugs are the smallest of the Gerromorpha, and have an appearance of tiny veliids. Hebrids sometimes move across water surfaces, but walk or run rather than skate or scull on the surface. ==Description== Hebrids are small, ranging from lengths of 1.3 to 3.7 mm. They have a characteristic layer of short, dense hairs that cover their entire body, except on their abdomen and appendages, from which they derive the common name "velvet water bug". They have tarsi in two segments, with their hing legs shorter than their body. Unlike Veliidae and Mesoveliidae, they are known only as winged forms.〔Gooderham, John; Tsyrlin, Edward (August 31, 2002). ''The Waterbug Book: a Guide to the Freshwater Macroinvertebrates of Temperate Australia''. CSIRO Publishing. p. 160. ISBN 0-643-06668-3.〕 These wings however may be anywhere from well-developed, to short or lacking. The wing's membrane, when it is present at all, lacks any distinct veins that are common of shore bugs Saldidae. They are typically darkly-colored. The beak of Hebrids is long and reach to their middle pair of legs, and sits in a ventral groove on their head.〔Dunn, Gary A (July 31, 1996). ''Insects of the Great Lakes Region''. University of Michigan Press. p. 127. ISBN 0-472-06515-7.〕 They also have apical claws, lacking the preapical claws of Veliidae. Their pronotum is broad, usually more so than the rest of the body.〔Provonsha, Arwin V; MacCafferty, W Patrick (February 1, 1983). ''Aquatic Entomology: The Fishermen's and Ecologists' Illustrated Guide to Insects and Their Relatives''. Jones and Bartlett Publishers. p. 185. ISBN 0-86720-017-0.〕 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「Velvet water bug」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.