Hysterothylacium
genus of worms
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 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.
Begin with the source’s own compact description: “Hysterothylacium” is genus of worms. The dossier treats that line as a proposition to test through Hysterothylacium, genus and worms, not as a finished interpretation.
Why this record matters
The phrase “genus of worms” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Dec 1, 2024. The linked authority identifier is Q5304574. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2020.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Three-step research path
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Questions for further research
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This entry incorporates text from “Hysterothylacium” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.