Noun
Any relatively small, generally aquatic, oligochaete, a member of a sometimes used size-based division of the class Oligochaeta.
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Before the study was begun, the known oligochaete fauna of Tasmania consisted of six species of aquatic microdriles, twenty-three indigenous species of megascolecid earthworms, and introduced earthworms of the family Lumbricidae.
In microdriles the circular muscle is generally only weakly developed.
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Microdriles in our subcontinent are represented by three families of aquatic oligochaetes namely Naididae, Tubificidae and Phraeodrilidae, and terrestrial pot worms of the Enchytraeidae.