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the bristleworms. Of the approximately 9000 species of annelids, more than 8000 are polychaetes. These segmented worms are among the most common marine organisms, and can be found living in the depths of the ocean, floating free near the surface, or burrowing in the mud and sand of the beach.he bristleworms. Of the approximately 9000 species of annelids, more than 8000 are polychaetes. These segmented worms are among the most common marine organisms, and can be found living in the depths of the ocean, floating free near the surface, or burrowing in the mud and sand of the beach.
The Polychaeta or polychaetes are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin.Indeed, polychaetes are sometimes referred to as bristle worms.olychaetes are segmented worms, generally less than 10 cm (3.9 in) in length, although ranging at the extremes from 1 mm (0.039 in) to 3 m (9.8 ft). They can sometimes be brightly coloured, and may be iridescent or even luminescent.