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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 Daphnia pulex ： ウィキペディア英語版 Daphnia pulex }} ''Daphnia pulex'' (D. pulex) is the most common species of water flea. It has a cosmopolitan distribution: the species is found throughout the Americas, Europe and Australia.〔(【引用サイトリンク】title=''Daphnia pulex'' )〕 It is a model species, and was the first crustacean to have its genome sequenced. ==Description== ''Daphnia pulex'' is an arthropod whose body segments are difficult to distinguish. They can only be recognised by the appendages they bear (only ever one pair per segment), and by studying the internal anatomy. The head is distinct and is made up of six segments which are fused together even as an embryo. It bears the mouthparts, and two pairs of antennae, the second of which are enlarged into powerful organs used for swimming.〔 There is no clear division between thorax and abdomen, which collectively bear five pairs of appendages.〔 The shell surrounding the animal extends posteriorly into a long or short spine. 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「Daphnia pulex」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.