polychaete

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polychaete

any marine ANNELID worm of the order Polychaeta, including both errant (moving) and tubicolous (mainly sedentary) forms. They are characterized by the presence of CHAETAE carried on parapodia (projections from the body) and in errant forms the head is well developed. Fertilization is external. The group includes Nereids (bristle worms such as the ragworm), tube worms and fan worms.
References in periodicals archive ?
The extinct plumulitid machaeridians look like modern bristleworms, whose stout walking limbs bear long bundles of bristles; however, on their backs, machaeridians carried a set of mineralized plates.
Plumulitids were annelid worms - the group including earthworms, bristleworms and leeches, today found everywhere from the deepest sea to the soil in your yard.
Levin's group is studying bristleworms, in particular why so many from the family Dorvilleidae inhabit these seeps (17 species so far, including 10 in one genus).