The annelids are segmented worms. The majority are marine animals of shallow water. Some are free-swimming, but others build temporary or permanent tubes or burrows in which they live a sedentary existence. Better known members of the phylum are the earthworms, which also have related species in freshwater. The leeches form a distinct group found as predators or parasites in freshwater or moist soil.
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Suggestions for futher reading
- Dales, R. P., Annelids (Hutchinson, 1963), out of print.Google Scholar