Genus Malenchus
Andrassy, 1968
Neomalenchus  Siddiqi, 1979
Paramalenchus Sumenkova, 1988
Telomalenchus Siddiqi, 2000

Diagnosis:  Duosulciinae.  Body elongate-fusiform, with strong and regular tapering behind vulva so that width at anus becomes about half that at vulva.  Annules prominent as cuticle folds between them.  Lateral field with two incisures delimiting single narrow but elevated ridge, which, in SEM, shows 12 or more fine longitudinal lines (subgenera Malenchus, Neomalenchus), or with four or six incisures making three or five longitudinal bands on most of body (subgenus Telomalenchus).  Cephalic region elevated, flattened dorso-ventrally but not to a great extent, elevated with four to six fine annules.  Labial plate rectangular, bearing four cephalic papillae (pits); amphidial slits curved ventrally and extending for one to two cephalic annules (subgenera Malenchus, Neomalenchus) along the lateral side of head.  Stylet 7-14 um long, with distinct knobs.  Precorpus equal to or shorter than isthmus, postcorpus a muscular bulb with refractive thickenings or lacking musculature (subgenus Neomalenchus).  Basal bulb pyriform with flat to indented base.  Vulva located in a body cavity.  Spermatheca elongate, oval, or bilobed, offset, directed forward.  Vagina straight, not sclerotized, directed inward.  Uterus with quadricolumella.  Postvulval uterine sac present.  Prophasmids dorso-sublateral, about one body width anterior to vulva.  Tail elongate-conoid to a pointed or hooked tip.  Bursa adanal.  Spicules tylenchoid.  Gubernaculum fixed.  Cloacal aperture on a cone formed by depression in body at front and rear;  lips narrow, pointed.
(Description- Siddiqi, 2000)

Species found:       at:
M. fusiformisdddddd Konza Prairie, 9-Mile Prairie