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What type of symmetry do sponges have? A: Some sponges have radial symmetry, but many species are irregular in shape and have no symmetry at all. Two simpler groups of sponges, known as asconoid an... Full Answer >
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.