A sponge, although not seeming complex has it's very own complicated body and life style. The anatomy of a sponge is composed of two outer body layers which are thinnly seperated by a gel layer, also called the mesohyl, which is acellular. Spicules or spongin fibers make up the gel layer. Different classes of sponges appear as different shapes but the life functions remain the same as sponges lack both organs and tissues. Sponges are invertebrates and their size ranges from a few milimeters up to two meters tall!
Some examples of spongin shapes:
- tubes
- fans
- cups
- cones
- blobs
- barrels
- crusts
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