(Thorne, 1974) Andrássy, 1991
Syn.: Thonus cylindricus Thorne, 1974
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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.
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