Hysterothylacium Poecilurai
''Hysterothylacium'' is a genus of parasitic roundworms in the family Raphidascarididae. As of 2020 it consists of over 70 species and is considered one of the largest of the Ascaridida, ascaridoid genera parasitising fish. Ecology Species in the genus complete their life cycle between predatory teleost fish as their final host and various species of invertebrates and teleost as their intermediate hosts. These parasites are not host specific in the larval stages and infect a broad range of fish species; thus they are widely distributed throughout the aquatic ecosystem and exhibit a global distribution. ''Hysterothylacium aduncum'' infection in fish has been associated with mechanical damage to the heart, eye and fish musculature which occurs as a result of parasite larval migration. Catastrophic loss of fish fry due to infection with an unknown species of ''Hysterothylacium'' has been reported. Human infection is not common but has been reported in Japan. References

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Raphidascarididae
Raphidascarididae is a family of roundworms (also known as nematodes) in the order Ascaridida. It encompasses nine genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ..., including '' Hysterothylacium'', which parasitize marine fish, and '' Raphidascaris''. The family contains over 190 species. References Ascaridida Nematodes {{chromadorea-stub ...
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