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Astome : ウィキペディア英語版
Astome

Astomes (order Astomatida) are a group of ciliate protozoans commonly found in the guts of annelid worms, especially oligochaetes, and other invertebrates. As their name implies, these parasites are characterized by an absence of mouth. The cell is covered by uniform cilia; in addition, some astomes attach themselves to their hosts by suckers, while others use various hooks or barbs.
Asexual reproduction is by transverse fission. In some cases, chains of individuals form by repeated fission without separation of the cells. The sexual phenomenon of conjugation also occurs. Representative genera include ''Cepedietta'', which lives in the amphibian digestive system, and ''Radiophrya''.
==References==


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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