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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 Polypterus ： ウィキペディア英語版 Polypterus ''Polypterus'' is a genus of freshwater fish in the bichir family (Polypteridae) of order Polypteriformes. The type species is the Nile bichir (''P. bichir''). Fishes in this genus live in various areas in Africa. The etymology of the genus name derives from a combination of the Greek prefix πολυ-, ''poly-'' (many) and the root word πτερον, ''pteron'' (wing or fin) – "many fins". ''Polypterus'' is the only known vertebrate to have lungs, but no trachea. == Recoil aspiration == In shallow water, Polypteris inhales primarily through its spiracle (blowhole). Exhalation is powered by muscles in the torso. During exhalation, the bony scales in the upper chest become indented. When the muscles are relaxed, the bony scales spring back into position, generating negative pressure within the torso, resulting in a rapid intake of air through the spiracle. The air is nearly sufficient to fill the lungs. This is followed by one cycle of buccal (mouth) pumping, which "tops off" the lungs, with the surplus air from the buccal pumping process discharged through the pharynx. According to one hypothesis, Devonian tetrapods may have inhaled in this way. 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「Polypterus」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.