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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 Caenis (genus) ： ウィキペディア英語版 Caenis (genus) ''Caenis'' is a genus of mayflies. They are very small in size, sometimes with a body of only an 1/8 of an inch (). ==Distribution and ecology== ''Caenis'' is one of the most abundant mayfly genera of the Holarctic. Larvae can occur in high densities on the bottoms of shallow ponds and lakes up to an altitude of 1800 meters in the (). Densities of 700-1700 larvae per square meter have been reported for ''C. luctuosa'' and ''C. horaria'' on bottoms covered with organic detritus or decaying leaves. Densities on mineral sediments are an order of magnitude lower (4-330 animals per square meter). 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「Caenis (genus)」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.