Medical term:
oligochaeta
oligochaete
(ŏl′ĭ-gō-kēt′, ō′lĭ-)n.
Any of various annelid worms of the class (or subclass) Oligochaeta, including the earthworms and aquatic species found chiefly in freshwater, which lack the appendages typical of polychaetes.
ol′i·go·chae′tous (-kē′təs) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Oligochaete
any ANNELID worm of the class Oligochaeta, including the earthworms. They occur mainly in nonacidic soils and in freshwater, and are distinguished from the other major order of CHAETOPODS, the POLYCHAETES, by a lack of PARAPODIA (projections from the body), few CHAETAE and lack of a well-developed head. Fertilization is internal (external in polychaetes).Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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