The sponge is considered the oldest animal phyla. They are multicellular, but have no tissues or organs. The name Polyfera means "pore bearer" in Latin. The surface of the body of the sponge is covered with 1 cell thick skin.
What kind of organs does the sponge have?
Sponges are rare animals in that they lack clear organs to perform various functions. The most important structure is a canal and chamber system called the water flow system, where water circulates and carries food and oxygen to the sponge.
Does the sponge have any special organs?
Unlike protozoa, sponges are multicellular. However, unlike higher metazoans, the cells that make up the sponge are not organized into tissues. Therefore, the sponge lacks true tissue and organs. Moreover, they have no body symmetry. However, sponges have special cells that perform certain functions.
What kind of body does a sponge have?
Body types: There are three body types of sponge: asconoid, syconoid, and leuconoid. The asconoid sponge is tubular and the central shaft is called the sponge coil. When you hit the bristles of the choanocytes, water is pushed into the sponge coil through the pores on the body wall. Choanocytes line the sponge coil and filter nutrients from the water.
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