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annelid

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.02 sec.

annelid

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Body plan of an earthworm. Partitions (septa) divide the body cavity (coelom) into more than 100 …
(credit: © Merriam-Webster Inc.)
Any member of a phylum (Annelida) of invertebrate animals that possess a body cavity (coelom), movable bristles (setae), and a body divided into segments by crosswise rings. Known as segmented worms, annelids are divided into three classes: marine worms (Polychaeta; see polychaete), earthworms (Oligochaeta), and leeches (Hirudinea).
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But it is conceivable that the now utterly lost branchiae might have been gradually worked in by natural selection for some quite distinct purpose: in the same manner as, on the view entertained by some naturalists that the branchiae and dorsal scales of Annelids are homologous with the wings and wing-covers of insects, it is probable that organs which at a very ancient period served for respiration have been actually converted into organs of flight.
The Origin of Species by Darwin, Charles View in context
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