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annelid

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.04 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).

annelid
1. any worms of the phylum Annelida, in which the body is divided into segments both externally and internally. The group includes the earthworms, lugworm, ragworm, and leeches
2. of, relating to, or belonging to the Annelida


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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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