Superfamily Monorchioidea Odhner, 1911
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Members of the Monorchiidae are parasites in the digestive tract of marine and freshwater fishes. They are characterized by the possession of a spiny tegument, complex terminal genitalia armed with spines, restricted vitelline follicles and well-developed uterine coils. According to the recent review provided by Madhavi (2008), the family contains 40 nominal genera distributed over 6 subfamilies.