Gnathiidae

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The Gnathiidae are a family of isopod crustaceans. They occur in a wide range of depths, from the littoral zone to the deep sea. Gnathiidae have only five pairs of walking legs.[1] The adults are associated with sponges and may not feed.[2] The juvenile form is known as a 'praniza', and it is a temporary parasite of marine fish.[2][3] These forms are not larvae; Gnathiidae instead become parasitic during the manca stage. Mancae of the Gnathiidae closely resemble the adult form, however they lack the final pair of pereiopods.

File:Hesse Mémoire sur les pranizes et les ancées Plate 3.png
Drawings of Gnathiidae by Hesse (1864)[3]

Taxonomy in the family relies on male characters, such that females and juveniles cannot be reliably identified.[2] The family contains 182 species,[4] divided among the following genera:[5]

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The extinct Jurassic genus Urda is thought to represent a stem-group to the family, and is suggested to have had a similar parasitic lifestyle.[6][7]

References

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  1. ^ Page Module:Citation/CS1/styles.css has no content."Life history of gnathiid isopod-current knowledge and future directions". ResearchGate. Archived from the original on 2023-03-19. Retrieved 2025-09-03.
  2. ^ a b c Page Module:Citation/CS1/styles.css has no content.Richard Brusca, Vania R. Coelho & Stefano Taiti (2001). "Suborder Gnathiidae [sic]". Guide to the Coastal Marine Isopods of California. Tree of Life Web Project. Retrieved August 28, 2010.
  3. ^ a b Hesse, Eugène (1864). Mémoire sur les pranizes et les ancées et sur les moyens curieux à l'aide desquels certains crustacés parasites assurent la conservation de leur espèce. Extrait du Tome XMII des Mémoires Présentés par Divers Savants à l'Institut Impérial de France. Paris, J. B. Baillière et Fils, Libraire de l’Académie Impériale de Médecine. BHL PDF in BHL
  4. ^ Page Module:Citation/CS1/styles.css has no content.Jörundar Svavarsson (2006). "New species of Gnathiidae (Crustacea, Isopoda, Cymothoida) from seamounts off northern New Zealand" (PDF). Zootaxa. 1173: 39–56.
  5. ^ Page Module:Citation/CS1/styles.css has no content.WoRMS (2010). M. Schotte; C. B. Boyko; N. L. Bruce; G. C. B. Poore; S. Taiti; G. D. F. Wilson (eds.). "Gnathiidae". World Marine, Freshwater and Terrestrial Isopod Crustaceans database. World Register of Marine Species. Retrieved August 28, 2010.
  6. ^ Page Module:Citation/CS1/styles.css has no content.Nagler, Christina; Hyžný, Matúš; Haug, Joachim T. (2017-03-09). "168 million years old "marine lice" and the evolution of parasitism within isopods". BMC Evolutionary Biology. 17 (1): 76. Bibcode:2017BMCEE..17...76N. doi:10.1186/s12862-017-0915-1. ISSN 1471-2148. PMC 5345136. PMID 28279151.
  7. ^ Page Module:Citation/CS1/styles.css has no content.Schädel, Mario; Nagler, Christina; Hyžný, Matúš (2023). "Fossil relatives of extant parasitic crustaceans from the Mesozoic of Europe - Parientes fósiles de parásitos actuales de crustáceos, del Mesozoico de Europa". Boletín de la Sociedad Geológica Mexicana. 75 (2): 1–57. doi:10.18268/BSGM2023v75n2a220323. ISSN 1405-3322. JSTOR 27221848.

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8. Wittler, Frank A. (2007): Ein Isopode im Mittelbajocium von Velpe bei Osnabrück (Crustacea, Dogger, NW – Deutschland).- Arbeitskreis Paläontologie Hannover 35 (2007) 15 – 21; Hannover 2007_1.pdf

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