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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Phylum: Nematoda
Classis: Enoplea
Subclassis: Dorylaimia
Ordines: Dioctophymida - Dorylaimida - Mermithida - Mononchida - Trichocephalida

Dorylaimia is a subclass of nematodes.


In general, members of subclass Dorylaimia exhibit a great diversity of terrestrial and freshwater species, most of which are large predators or omnivorous free-living species. Some are plant parasites, whereas others are animal parasites (Trichinellida and Mermithida). No members of the Dorylaimia are found in marine habitats. Dorylaimia bear an odontostyle, a protrusible, hollow, needlelike tooth for puncturing and emptying food items.

Phylogenetic analysis of phylum Nematoda suggests three distinct basal clades, the dorylaims, enoplids, and chromadorids.[1] These represent Clades I, II and C+S of Blaxter (1998).[2] Of these, the first two appear to have sister clade status, allowing resolution into two classes, Enoplea and Chromadorea, and division of the former into two subclasses corresponding to Clades I and II respectively, the Enoplia and Dorylaimia. Nevertheless, the possibility remains that Dorylaimia will eventually be shown to be a distinct third class of nematodes.[3]

Phylogenetic analysis has resulted in a reorganization, with, for instance, moving the Triplonchida to subclass Enoplia.

Subclass Dorylaimia is divided into the following orders;

Order Dioctophymatida Baylis and Daubney, 1926
Order Dorylaimida Pearse, 1942
Order Isolaimida Cobb, 1920
Order Marimermithida Rubtzov, 1980
Order Mermithida Hyman, 1951
Order Mononchida Jairajpuri, 1969
Order Muspiceida Bain and Chabaud, 1959
Order Trichinellida Hall, 1916


Lee 2010, p. 13.
Blaxter 1998.

Lee 2010, p. 18.

Further reading

Lee, Donald L, ed. (2010). The biology of nematodes. London: Taylor & Francis. ISBN 978-0415272117. Retrieved 16 December 2014.
Zhang, Zhi-Qiang, ed. (2011). Animal biodiversity : an outline of higher-level classification and survey of taxonomic richness. Auckland, N.Z.: Magnolia Press. ISBN 978-1869778491. Retrieved 15 December 2014.
Blaxter, Mark L.; De Ley, Paul; Garey, James R.; Liu, Leo X.; Scheldeman, Patsy; Vierstraete, Andy; Vanfleteren, Jacques R.; Mackey, Laura Y.; Dorris, Mark; Frisse, Linda M.; Vida, J. T.; Thomas, W. Kelley (5 March 1998). "A molecular evolutionary framework for the phylum Nematoda". Nature. 392 (6671): 71–75. doi:10.1038/32160. PMID 9510248. S2CID 4301939.
George O. Poinar Jr. The Evolutionary History of Nematodes: As Revealed in Stone, Amber and Mummies. 2011
Domingo Jiménez Guirado, Manuel Peralta Peralta, R. Peña Santiago. Nematoda: Mononchida, Dorylaimida I, Volume 30. 2007

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