Ctenidium (mollusc)
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Pleurobranchaea_meckelii.jpg/220px-Pleurobranchaea_meckelii.jpg)
A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails.[1] Some aquatic gastropods possess one ctenidium known as monopectinate and others have a pair of ctenidia known as bipectinate.
A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange.[2] The word is Latinized but is derived from the Greek ktenidion which means "little comb", being a diminutive of the word kteis meaning comb.
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Pair of large, grey gills visible inside the mantle cavity of a giant squid
References
[edit]- ^ Ruppert Invertebrate Zoology: A Functional Evolutionary Approach.
- ^ Respiratory system Archived 2020-08-09 at the Wayback Machine The apple snail. Retrieved 2012-04-20.