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Respiratory system of gastropods : ウィキペディア英語版
Respiratory system of gastropods
The respiratory system of gastropods varies greatly in form. These variations were once used as a basis for dividing the group into subclasses. The majority of marine gastropods breathe through a single gill, supplied with oxygen by a current of water through the mantle cavity. This current is U-shaped, so that it also flushes waste products away from the anus, which is located above the animal's head, and would otherwise cause a problem with fouling.
In the pulmonate gastropods, which are found on both land and in freshwater, the gill has been replaced by a simple lung.
==With gills==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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