Question

what is asconoid type canal system??????

Answer 1

hey durga!

Asconoid sponges have the simplest type of organization. Small and tube shaped, water enters the sponge through dermal pores and flows into the atrium. Choanocyte flagella create the current to expel it through a single osculum

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Answer 2

The asconoid type of canal system is re­garded to be the most simple and primitive grade of canal system. Asconoid type is present in these sponges whose body is vase-like and radially symmetrical. The wall is extremely thin. It encloses a large spongocoel (atrium) opening at the summit by a narrow osculum. The spongocoel is lined by choanocytes.

The wall is pierced by numerous microscopic ap­ertures termed as the incurrent pores or ostia which extend from the external surface to the spongocoel. Each pore is intracellular disposed in a porocyte. The asconoid type of canal system is characterised by the presence of a complete continuous layer of choanocytes lining the spongocoel interrupted only by the porocyte.


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