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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 Orange-footed pimpleback mussel ： ウィキペディア英語版 Orange-footed pimpleback mussel The orange-footed pimpleback mussel or orangefoot pimpleback,〔Bogan, A.E. 1996. (''Plethobasus cooperianus'' ). (2011 IUCN Red List of Threatened Species. ) Downloaded on 27 September 2011.〕 scientific name ''Plethobasus cooperianus'', is a rare species of freshwater mussel in the family Unionidae, the river mussels. This aquatic bivalve mollusk is native to the Tennessee, Cumberland, and lower Ohio Rivers in the United States, where its distribution has declined over 70%.〔(''Plethobasus cooperianus''. ) The Nature Conservancy.〕 This rounded mussel grows up to 9.5 centimeters long by 7.8 wide by 4.6 high.〔USFWS. (''Plethobasus cooperianus'' Recovery Plan. ) September 1984.〕 It has bumps on the posterior part of the shell and the foot is orange in live specimens.〔 The mussel mainly lives in deep, fast-flowing rivers, especially with gravel or sand on the bottoms. It buries itself in the substrate under up to 29 feet of water.〔USFWS. (''Plethobasus cooperianus''. ) Species Profile.〕 This species was once common in some areas. It is now restricted for several reasons. Rivers throughout much of its range have been impounded. There has been an increase in silt, which the mussel cannot tolerate. Pollution of the waterways has led to the decline of this and other mussels.〔 The zebra mussel (''Dreissena polymorpha'') is a widespread threat.〔 ==References== 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「Orange-footed pimpleback mussel」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.