Mediorhynchus
genus of worms
Mediorhynchus is a genus of small parasitic spiny-headed (or thorny-headed) worms. Phylogenetic analysis has been conducted on two known species of Mediorhynchus and confirmed the placement along with the related genus Gigantorhynchus in the family Gigantorhynchida. The distinguishing features of this order among archiacanthocephalans is a divided proboscis (specifically, the presence of a "teloboscis" which is the posterior third of a proboscis). This genus contains fifty-eight species that are distributed globally. These worms exclusively parasitize birds by attaching themselves around the cloaca using their hook-covered proboscis. The bird hosts are of different orders.
Taxonomy
Mediorhynchus is monophyletic based on phylogenetic analysis.
Description
Species can be identified primarily morphologically by the arrangement of hooks of the proboscis. The presence of a divided proboscis (specifically, the presence of a "teloboscis" which is the posterior third of a proboscis) is an autapomorphy of Mediorhynchus. Males in some species possess eight cement glands which are used to temporarily close the posterior end of the female after copulation.
Begin with the source’s own compact description: “Mediorhynchus” is genus of worms. The dossier treats that line as a proposition to test through Mediorhynchus, genus and worms, not as a finished interpretation.
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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 Sep 10, 2026. The linked authority identifier is Q2783016. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Mediorhynchus” 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.