Ainudrilus is a genus of clitellate oligochaete worm. This parasite infects the sperm sacs of oligochaete worms. Phallodrilinae is a subfamily of clitellate oligochaete worm. Limnodriloidinae is a subfamily of clitellate oligochaete worm. Alternatively, a fish can become infected by eating an infected oligochaete. Usually a fish and an oligochaete or polychaete worm, and in one case a bryozoan. A megadrile is a kind of worm, a mostly terrestrial oligochaete. The Enchytraeidae are a microdrile oligochaete family. One way to prevent Eustrongylidosis is to control oligochaete populations. Rhyacodrilinae is a subfamily of clitellate oligochaete worm in the family Naididae. "Myxobolus cerebralis" has a two-host life cycle involving a salmonid fish and a tubificid oligochaete. A paratenic host may then ingest the oligochaete. These spores are released from the oligochaete anus into the water. These spores develop inside the oligochaete into forms which are infective to salmonids. Within the oligochaete the parasite eggs hatch and develop into second and third stage larvae.