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Acetabulum (morphology) : ウィキペディア英語版
Acetabulum (morphology)
Acetabulum (plural acetabula) in invertebrate zoology is a saucer-shaped organ of attachment in some annelid worms (like leech) and flatworms. It is a specialised sucker for parasitic adaptation in trematodes by which the worms are able to attach on the host. In annelids, it is basically a locomotory organ for attaching to a substratum. The name also applies to the suction appendage on the arms of cephalopod molluscs such as squid, octopus, cuttlefish, ''Nautilus'', etc.
==Etymology==

Acetabulum literally means "a small saucer for vinegar". It is derived from two Latin words ''acetum'', meaning "vinegar", and ''-bulum'', a suffix denoting "saucer" or "vessel" or "bowl". The name is used because of the saucer-like structure in the invertebrates.〔

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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