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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.
We begin with the polychaetes (btistle worms). Polychaetes, like the earthworms are segmented (annelid) worms. Earthworms, leeches and some freshwater worms belong to a group called the oligochaetes, since they have only a few spines (chaetae) per segment.he tentacles of some Terebellids may extend for a metre or more in length. Left: a computer model of a polychaete based on Eunice aphroditois, the bobbit worm. These worms eat algae, crustaceans and other worms. These worms frequently reach 2 to 3 metres in length, but 6 metre giants have been reported.