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Sponges are built up from relatively few cell types, the main ones being choanocytes, pinacocytes, amoebocytes and lophocytes. Pinacocytes, these form much of the epidermis of sponges and are as close as a sponge gets to having a tissue.Generally they cover the exterior and some interior surfaces. sponge is a simple organism that is easy to describe. A sponge is a sedentary, filter-feeding metazoan which has a single layer of flagellated cells that drive a unidirectional current of water through its body. such a brief description though does not do them justice.
Sponges come in two basic types: encrusting or free-standing. Although neither of these names are part of the true classification of sponges, it does make it a bit easier to organize them. Encrusting sponges typically cover the surface of a rock in the same manner that moss covers a rock on land. Free-standing sponges are a bit more interesting.