Bodies of both sexes almost straight when killed by gradual heat.  Neck tapering rather uniformly to the continuous rounded lip region which is about one-third as wide as the base of the neck.  Amphids about half as wide as the head.  Spear length about equal to width of lip region.  Esophagus enlarged in posterior three-fifths by gradual expansion.  Cardiac glands prominent.  Intestinal cells densely filled with dark granules.  Ovaries reflexed about half their length.  Eggs twice as long as body width.  Vulva transverse.  Female prerectum length two to three times body width.  Rectum length slightly more than anal body diameter.  Female tail uniformly tapering to the blunt, rounded terminus.  Ventromedian supplements three to five.  The male tail figured is a drawing by the late Mr. Chambers from a specimen which apparently was killed with a hot corrosive sublimate solution, causing the tail to become arcuate.

Diagnosis: Nygolaimus with the above measurements and general description.  Distinctive because of its straight body when killed by gradual heat and because of its smooth rounded head.  It is most closely related to Nygolaimus thornei from which it differs in its shorter esophagus and more slender body.

Habitat:  Soil from forest, Arlington Farm; and stream bank, Broad Run, Virginia, U.S.A.
(Description- Thorne, 1939)

DNA Sequences Obtained

Specimen:	Collected:
Homestead BBF-96	Homestead National Monument