Takamangai cylindrica
(Thorne, 1974) Andrássy, 1991
Syn.: Thonus cylindricus  Thorne, 1974
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Measurements (from Thorne, 1974)
L = 1.6-1.9 mm; a = 38; b = 4.8; c = 66; V = 48

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.