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One of a layer of flagellated cells lining the body cavity of a sponge and characterized by a collar of cytoplasm surrounding the flagellum. Also called collar cell.

[Greek khoanē, funnel (from khein, to pour; see gheu- in Indo-European roots) + -cyte.]


(Zoology) any of the flagellated cells in sponges that maintain a flow of water through the body. A collar of protoplasm surrounds the base of the flagellum. Also called: collar cell
[C19: from Greek khoanē funnel (from khein to pour) + -cyte]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.choanocyte - any of the flagellated cells in sponges having a collar of cytoplasm around the flagellumchoanocyte - any of the flagellated cells in sponges having a collar of cytoplasm around the flagellum; they maintain a flow of water through the body
flagellated cell - any cell or one-celled organism equipped with a flagellum
References in periodicals archive ?
Amazingly, half of the sponge's choanocyte (filtration) cells had divided and the choanocyte's cell division cycle was a phenomenally short 5.
The narrower canals and smaller choanocyte chambers may result in a reduced water flow when compared to LMA sponges (Weisz et al.
The sponge choanocyte is considered one of the few examples of a true sieve filter in metazoans (Riisgard and Larsen, 2001).
About 36 h after settlement, choanocytes are differentiated in the inner cell mass and formation of the choanocyte chamber begins.
Male generative cells appear to originate from choanocytes that migrate into the lumen of choanocyte chambers, where spermatogenesis takes place.
A section through the sponge reveals two distinct regions: a cortical zone called ectosome, and an internal zone, the choanosome, which contains the choanocyte chambers.
The choanocytes of Acanthochaetetes wellsi possess a periflagellar sleeve; a central cell at the apopyle of the choanocyte chambers, as in the Hadromerida; and a spicule complement similar to that of the family Spirastrellidae in the order Hadromerida (Hartman and Goreau, 1975; Vacelet and Garrone, 1985; Reitner and Engeser, 1987; Boury-Esnault et al.
In the sections of sponge branches we were able to identify the following epithelial cells: exopinacocytes (covering the outer sponge surface), endopinacocytes (lining the water canals), and choanocytes (lining choanocyte chambers in the canal system).
Sometime later, a canal system and choanocyte chambers are formed in the metamorphs.
Therefore, a study of the choanocyte chambers was also carded out.
And a patch inside one of the tubes has pits encircled by raised collars, resembling cells called choanocytes that move water through sponges.