Photo Gallery- Forensic Nematology
Description (from Thorne, 1974)
Body cylindroid arcuate to open C when relaxed. Lip region 1/4 width of neck base. Lateral fields 1/4 - 1/3 body width. Labia papillae low, rounded. Spear 11 um long with aperture occupying half its length. Esophagus enlarged in posterior 2/5 by gradual expansion. Cardia a thick disc, then conoid. Intestinal granules excessively fine, colorless. Prerectum length 2 - 2 1/2 times body diameter. Rectum about as long as tail. Tail convex conoid to bluntly rounded terminus. Two pairs caudal pores present. Vulva a transverse slit with broad, escutcheon-shaped vagina. Vulvar glands prominent.
Thonus cylindricus is closely related to T. elegans from which it differs in the short prerectum, form of vagina, and longer spear aperture.
Habitat: Dying lawn grass, Aberdeen, South Dakota, and prairie sod near Irvine, North Dakota.