CHOANODERM-The gastrodermis consists of a single layer of flagellated cells,the choanocytes. The choanocyte is an ovoid cell with free end bearing a transparent contractile collar. The collar surrounds a single long flagellum which arises from a basal granule. The nucleus lies at the centre of its cell body . The choanocytes are used in feeding and for ensuring the flow of water within the animal,s body.
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