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Halipegus occidualis, is a species of parasitic Hemiuriform worm in the genus Halipegus. It is a parasitic digenean found most commonly in Europe, and North and South America.

Life Cycle
Water carries the eggs shed from an infected ranid frog to snails, acting as the worm's intermediate host. An Ostracod acts as the second intermediate host after picking up the worm's cercaria. Odonate naiads then ingest the infected ostracod acting as a paratenic host before being consumed by a ranid frog. Ranid frogs are the worm's definitive host and can be found reproducing in the the buccal cavity of an adult frog. Fertilized eggs are passed through the feces to continue the cycle.