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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.
Polychaetes are a class of worms that are very common marine organisms in the depths of the ocean. These worms are also called bristle worms. Most Polychaetes contains a closed circulatory system but in many small polychaetes, they lack a circulatory system. The blood is effected by a system of closed vessels with muscular walls.