January 2009
World Book Science Dataset;1/1/2009, p1
Reference Entry
Annelid, a member of a large phylum of worms, most of whose members have segmented, tubular bodies. The name comes from the Latin word for "little ring," and refers to the ring-like segments, or somites, of the body. Most species have tiny, stiff, hairlike appendages, called setae, on each somite. Annelids include earthworms, leeches, and sandworms. They are found worldwide in the sea, in freshwater lakes and ponds, in brackish water, and in the soil. Annelids vary in length from about 1/32 of an inch (0.8 mm) to 10 feet (3 m). There are more than 9,000 species.


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