Story: Marine animals without backbones
This red peanut worm (species unidentified) clings to the side of a sponge. Some peanut worms have the shape of unshelled peanuts, but this is not a defining characteristic. All possess an unsegmented body consisting of a forward section (called an introvert), which can be completely withdrawn into the back section of the animal. Peanut worms are mostly found in shallow waters. Some are mud dwellers, while others live in crevices or even bore into rocks.
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