Filenchus cylindricus
(Thorne & Malek,1968) Niblack & Bernard, 1985
Syn: Tylenchus cylindricus
Photo Gallery- Konza Prairie
Photo Gallery- Nine-mile Prairie

L = 1.0 mm; V = 64, a=40; b=6.6; c= 6.5

Body cylindroid from near middle of esophagus to vulva. Striae about 1.3u apart, conspicuous near head but obscure on most of body. Subcuticle not straited.  Lateral field a plain band about 1/5 body width. Lip regionrounded, unstriated. Spear 13u long with strong shaft and large knobs, its muscles attached to a narrow cuticularized band of subcuticle and the basal plate of the cephalic framework. Dorsal esophageal gland outlet near spear base.  Basal bulb cylindroid, with excretory pore and hemizonid opposite anterior end. Nerve ring behind middle of isthmus. Cardia elongated, forming an isthmus between esophagus and intestine. Anterior ovary outstretched. Spermatheca filled with sperms. Vulva-anus distance 1.3 times tail length. Male not collected.

Tylenchus cylindricus is distinctive because of its long cylindroid body, strong spear, attachment of spear muscles, elongated basal bulb, and vulva-anus distance being 1 and 1/3 times tail length.

Habitat:  Prairie sod adjacent to wheat fields near Presho and Winner, South Dakota, and Holbrook, Nebraska