Genus Mesodorylaimus
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ORDER DORYLAIMIDA
Family Dorylaimidae
Genus Mesodorylaimus
Genus Mesodorylaimus Andrassy, 1959
“Definition: Dorylaiminae. Characterized by dissimilar tails, female long-filiform, male short and bluntly rounded; cuticle smooth without longitudinal ridges.
Usually medium-sized species, the majority between 1 and 2 mm. but ranging from less than 1 mm. to 6 mm. Lateral pores are siad to be mostly absent from cuticle. Head usually narrower than body and slightly offset; arrangement of papillae as in Dorylaimus. Spear well developed. Guiding ring appearing single or double, the fixed anterior ring tends to be less than a head-width from anterior end of the body. Amphids as in Dorylaimus. Vulva transverse in 4 species, longitudinal in 3, a round pore in 2 and no data available for the great majority. Gonads of both sexes as in Dorylaimus. Supplements either contiguous or somewhat separate from one another with a gap between the ventral series and the pre-anal pair. Submedian, pre-anal papillae present in some series and the pre-anal pair. Submedian, pre-anal papillae present in some species. Pre-rectum of male extending forward beyond the range of the supplements in 13 species, within the range in 6 but no data available for the majority.Type species: Mesodorylaimus mesonyctius (Kreis, 1930) Andrassy, 1959 syn. Dorylaimus mesonyctius Kreis, 1930” From
Goodey, 1963 and from Tom Powers and Peter Mullin’s website http://nematode.unl.edu/ 
References:
Goodey T. and J.B. Goodey. 1963. Soil and Freshwater Nematodes. Butler and Tanner Ltd, London, Great Britain
Powers T. and P. Mullin. Plant and Insect Parasitic Nematodes. University of Nebraska Nematology Website. http://nematode.unl.edu/ Images: Photo Gallery- Haughton Crater
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