Rotylenchus

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ORDER RHABDITIDA
INFRAORDER TYLENCHOMORPHA
            Family Hoplolaimidae
                 Genus Rotylenchus

Rotylenchus Filipjev, 1936

Description:
“Lip region with or without annulations or striation. Esophageal glands overlap intestine primariraly dorsally and laterally.  Phasmids small in posterior part of body.  Four incisures in lateral field.  Female terminus hemispherical, usually slightly more convex dorsally, sometimes with small rounded ventral projection.”
From Sher, 1965 and Mai et al. 1996

 
“Female: Body spiral to C-shaped. Labial region offset or continuous wiht body contours, anteriorly rounded or flattened, generally annulated, with or without scattered transverse striae. Labial framework, stylet, and stylet knobs average sized for the family; knobs with rounded to indented anterior surface. DGO often close to stylet (6 um) but with a tendancy to posteriorly directed migration (up to 16um). Esophageal glands overlap intestine dorsallyand laterally; dorsal gland more developed than subventral glands; intestine symmetrically arranged between the subventral glands. Two genital branches outstretched, equally developed; posterior branch rarely degenerated. Epiptygma single or double present. Tail short, hemispherical, rarely with small ventral projection; phasmids pore- like, small, near anus level.
Male: Caudal alae enveloping tail, not lobed. Secondary sexual dimorphism not marked, sometime anterior part of male body slightly smaller than female.” Tom Power and Peter Mullin website:  http://nematode.unl.edu/rotyds.htm

References:

Mai W., Mullin P.G., Lyon H.H., Loeffler. K.  1996.  Plant-Parasitic Nematodes: A Pictorial Key to Genera.  Cornell University Press, Ithaca, NY.

Powers T. and P. Mullin. Plant and Insect Parasitic Nematodes. University of Nebraska Nematology Website. http://nematode.unl.edu/

Sher, S.A. 1965. Revision of the Hoplolaiminae (Nematoda). V. Rotylenchus Filipjev, 1936. Nematologica 11:173-198