Ditylenchus obesus
Thorne & Malek, 1968
Photo Gallery- Konza Prairie
Photo Gallery- Nine-mile Prairie

L = 1.0 mm; V = 79

Body obese, lying in an almost closed C shape when relaxed by gentle heat. Lip region truncate,three times as wide as high. Cephalic framework lightly sclerotized. Spear about 10u long with well developed knobs. Terminus minutely rounded. Ditylenchus obesus is distinctive because of the obese body which somewhat resembles an Anguina, pyriform basal bulb, elevated labia of vulva, large eggs and vulva-anus distance 1 3/4 times tail length.
(Descripton- Thorne and Malek, 1968)

Female: L = 1. mm; a = 28; b = 8; c = 12.5; V = 79%.
Height of cephalic capsule only 1/3 diameter of its base, capsule rounded.  Stylet 10u.  Stylet heads spherical, large.  Protractors obliquely oriented.  Procorpus long, narrowed posteriorly.  Metacorpal bulb strong, convex-oval, with sharply sclerotized valves.  Nerve ring in anterior part of isthmus.  Cardial bulb very large, rounded-pear-shaped, separated from the intestine by a deep constriction.  Excretory pore and hemizonid opposite anterior part of cardial bulb.  Ovary very long, its apex reaching or even passing the level of the nerve ring.  Posterior uterus longer than corresponding body diameter.  Vulva with developed lips; no anal protuberance.  Tail conical, with pointed terminus.  Found in grain, apparently wheat fields.  Nebraska.
(Description- Skrjabin, 1970)