Characterstics of Porifera

They are generally called sponges.
They are sessile,sedentary and marine.
Body is cylindrical ,asymmetrical or radial symmetry.
Sponge body consists of an outer layer ectoderm ,middle layer mesenchyme and an inner layer endoderm.
Body also contains numerous pores called ostia through which water enters in the body.
The internal body space is either hollow or contains numerous canals lined with choanocytes(fllagelated cells).
Body also contains one or more openings called oscula by which water passes out.
They feed on minute organisms and small organic particles ingested by choanocytes.
Respiration takes place by intake of oxygen from water current.
The skeletal system of soponges is made up of spongin fibers and calcareous spicules.

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