Nygolaimus obtusus
Thorne, 1930
Photo Gallery- Konza Prairie

Body almost straight when relaxed by gradual heat.  Amphids obscure, about one-third as wide as the head.  First three sections of pharynx forming a large cavity about one-third as wide as the head and twice as long as wide.  Ovaries reflexed one-third their length.  Tail, elongate-hemispherical.  Lateral cords one-fifth as wide as the body and conspicuous because of the large granules appearing in them.  Cardiac glands unusually small.  Intestine three-fourths as wide as the body, its cells densely packed with small granules.  Anus depressed, rectum one and one-third times as long as the anal body diameter.   Prerectum one and one-half times as long as the rectum.  The elongate-hemispherical tail bears two pairs of conspicuous pores, the posterior pair often showing distinct connections with an internal glandlike body.  Males unknown.

Habitat:  A single collection of 12 specimens from a sugar-beet field near Ogden, Utah, U.S.A.  Most closely resembles Nygolaimus aquaticus from which it is immediately distinguished by the distinctly set off lip region.