![]() The function of choanocytes in the sponge is critical. This simplest canal system in the sponge is of ascon type. Thus, in the syncoid type of sponge radial canals are present which are surrounded by choanocytes. Sycon type with cortex – This type of canal system is found in various genera of calcareous sponges’ like Heteropia, Grantia, etc. ![]() Simple sycon type – This canal system is found in calcareous sponges of heterocoelous.Ĭomplex sycon type – This type of canal system is present in Scypha. There are 2 types of syncoid canal system: There are hundreds of tiny spores called Ostia through which water enters the spongocoel and comes out from the osculum which is a large opening. It opens outside the body through the osculum. The central cavity in the sponge body is called spongocoel. In the body of sponges, the openings through water flow out of the body is called excurrent canals. The incurrent canal is the sponge that is lined by the cells of the porocytes. Porocytes are the large conical peculiar cells that are present between pinacocytes in the pinacoderm and they look like an open tube. In the body of sponges, the openings through which water enters from outside is called incurrent canals. They are small and chambers are flagellated. ![]() In the body of sponges, radial canals are lined by the choanocytes or collar cells. ![]() The radial canals are the disturbances that occur because of pushing out of the wall into finger-like projections. The transitional grade system between the simple ascon type and more complex ones is called syncoid canal system in the sponge. ![]() In sponges, when sexual reproduction is required then Choanocytes convert into spermatocytes as sponges lack reproductive organs. In sponge, both respiratory and digestive functions are improved due to this feature of Choanocyte. Hint: Choanocytes have the property to filter the particles out of the water by moving their flagella. ![]()
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