Aphelenchoides confusus
Thorne & Malek, 1968
Photo Gallery- Konza Prairie

0.6 mm; a = 30; b = 8.6 (bulb); c = 18; V = 71
Body cylindroid, tapering gradually near extremities. Cuticle finely striated. Lateral fields marked by 4 very fine lines, about 1/8 body width. Lip region set off by constriction. Spear without knobs, 12u long, its muscles attached to refractive band at base of cephalic framework. Corpus of esophagus set off from bulb by narrow constriction. Bulb filling neck cavity with massive valvular apparatus. Isthmus a slender hyaline tube shorter than neck width, set off from bulb by constriction. Nerve ring 1/2 body width behind bulb. Excretory pore opposite ring. Hemizonid more than a body width posterior to excretory pore. Basal esophageal lobes extending dorsally 5 or 6 body widths. Vulva with protuberant labia. Vagina extending slightly forward. Uterus with massive spheroid spermatheca almost filling body cavity, packed with sperms. Ovary outstretched, sometimes extending to median bulb. Eggs twice as long as body width. Posterior uterine branch collapsed, extending 1/3 to 1/2 distance back to anus. Tail conoid to blunt, rounded terminus, with phasmids almost terminal. Male not collected but sperms present in spermatheca.

Aphelenchoides confusus is distinctive because of offset lip region, knobless spear, posteriorly located hemizonid, massive spermatheca and elongate-conoid tail with phasmids near terminus. Probably most closely related to A. limberi Steiner, 1936 which has small spear knobs and cylindroid tail.

Holotype female and 4 other specimens as indexed under Aphelenchoides 3.

Habitat: Wheat field near Colorado-Nebraska state line on U.S. Highway 6, Downer, Minnesota, and Fairmont, North Dakota.

Under lower powers of the microscope this species resembles a long-tailed Aphelenchus, hence the name confusus.
(Description- Thorne and Malek, 1968)