Labronema hyalinum
(Thorne & Swanger, 1936) Thorne, 1939
Dorylaimus hyalinus Thorne & Swanger, 1936
Labronema uniforme Thorne, 1939 
Photo Gallery- 9 Mile Prairie

3.4 mm; a = 31; b = 4.0; c = 83; V = 53

Body rather cylindrical, tapering in the anterior third of the neck until the lip region is one-third to one-fourth as wide as the neck base.  Posteriorly it tapers very gradually to the blunt, conoid tail.  Cuticle in thick layers, radially striated.  Lateral cords about one-third as wide as body at level of vulva, the pores lying in two lines separated by a space considerably wider than the cords.  Lips low and rounded, the region set off by constriction.  Amphids somewhat triangular in contour.  Spear cylindrical, the aperture occupying only one-fifth of its length.  Junction of spear extension and esophagus surrounded by a spindle-shaped bulb.  Esophagus slightly narrowing at nerve ring until only about one-fourth as wide as neck, then gradually expanding to the enlarged basal portion which occupies two-thirds of its length.  Frequently there is scarcely any constriction separating the two portions of the esophagus. Nucleus of dorsal gland conspicuous.  Four submedian gland nuclei arranged like those of Labronema ferox. Cardia variable, flatly conoid to elongate conoid.  Intestine ten or twelve cells in circumfrence, well-filled with brown granules giving the nema a rich brown appearance.  Vulva transverse.  Eggs one and one-half times as long as body width and one-third as wide as long.  Ovaries reflexed two-thirds the distance back to vulva. Prerectum three to five times as long as body width, colorless, with practically no granules of any kind.  Rectum elongated, joined to end of prerectum, not inserted into the walls.  Males unknown and gravid females contained no sperms.

Diagnosis: Labronema with the above measurements and general description.  Distinguished from its most closely related species, L. fimbriatum, by the absence of membranes bordering the vulva and by its monosexuality and tail form.

Habitat:  Sod from shore of Lake Mary near Brighton, Utah, elevation about 9,000 feet; and wet soil in a mountain park, Blacks Fork, Summit County, Utah.  Also from soil about grass and weeds collected at Wrangell, Alaska, by Miss Jocelyn Tyler.

(Description from Thorne, 1939)