Porifera is derived from the Latin language Poros which means pore.
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There are many pores on the body of the animal of this association, they are commonly called sponges.
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Characters of phylum Porifera -
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– A multicellular organism is having a Cellular grade of construction.– All aquatic, exclusively marine but a few freshwater.
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– The plant likes fixed forms with variable body forms.– Solitary or colonial.
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The body is either symmetrical or radially symmetrical.
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The body surface is perforated by numerous pores, the Ostia serving for the inflow of water.
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The water current passes through the Ostia into the chambers and the central cavity and finally comes out of the body through the terminal aperture, The osculum.