choanocyte


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choanocyte

[kō′an·ə‚sīt]
(invertebrate zoology)
Any of the choanate, flagellate cells lining the cavities of a sponge. Also known as collar cell.
References in periodicals archive ?
To determine how choanocyte collars in large syconoid chambers filter, we fed the sponges bacteria and three sizes of latex microspheres.
Pieces of fractured choanocyte chambers were surveyed for interactions between particles and choanocytes.
The structure of choanocyte chambers and morphology of cells and particles were identical in sponges fed in situ and in vitro.
At the apical surface each choanocyte has a 15-[micro]m-long flagellum that is surrounded by a ring of microvilli (Fig.
Finally, the cells of the inner cell mass differentiate to choanocytes and are arranged in a choanoderm that surrounds a newly formed large gastral cavity.
One view holds that the flagellated cells are transformed into the choanocytes of juvenile sponges (Borojevic and Levi, 1965; Boury-Esnault, 1976; Amano and Hori, 1994, 1996), but the opposing view contends that they are lost by exfoliation or phagocytosis during metamorphosis (Bergquist and Glasgow 1986; Misevic et al.
Choanocytes derive from the cells of an inner cell mass.
In calcareous sponges, larval flagellated cells are transformed into the choanocytes of a juvenile during metamorphosis (Duboscq and Tuzet, 1937; Amano and Hori, 1992, 1993).
In this report, we show that larval flagellated cells transform into choanocytes during metamorphosis.
Minute ellipsoid granules in amoeboid cells and choanocytes
These are: the presence of choanocytes in sponges, the perceived simplicity of sponges relative to other animals, and comparisons of early embryological events (other characters, e.
The new sponge has neither choanocytes nor a system for filtering water.