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These animals, which are commonly called "peanut worms" because some have the general shape of shelled peanuts, are not particularly well studied. Only about 320 species have been formally described, all marine and mostly from shallow waters. While some (like the specimen of Sipunculus shown below) burrow into sand and mud, others (like this unidentified species from French Polynesia) live in crevices in rocks, or in empty shells. Still others bore into rock.