Microdrile

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.

Microdriles in our subcontinent are represented by three families of aquatic oligochaetes namely Naididae, Tubificidae and Phraeodrilidae, and terrestrial pot worms of the Enchytraeidae.