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COPYRIGHT 2001 Macmillan Reference USA, COPYRIGHT 2005 Thomson Gale, a part of The Thomson Corporation
Annelid
Annelids, or true-segmented worms, are members of the animal phylum Annelida, the most complex of all wormlike groups of organisms. Annelids are commonly found in terrestrial, as well as marine, brackish, estuarine, and freshwater ecosystems worldwide. Most annelids are free-living, although several species have parasitic, mutualistic, or commensal relationships with other animals, and many species are commonly associated with aquatic and terrestrial plants.
Six major classes comprise this phylum: Polychaeta (polychaete,...
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