Axonchium serpens
Photo Gallery- Konza Prairie

Female: 3.7 mm; a=50; b=3.3-4; c=100; V-1250.13
Male: 3.5 mm; a=59; b=4.1; c=100; T-60

Lips distinct, resting closely upon the adjacent neck.  Amphids almost as wide as head.  Sensillae about opposite base of spear extension.  Spear length about equal to width of lip region, the aperture occupying almost one-third its length.  Spear extension well cuticularized.  Anterior third of espophagus slender with a glandular section located just anterior to the nerve ring.  Posterior two-thirds of esophagus enlarged and set off by constriction, practically cylindrical except for a slight tapering near the extremities, its musculature columnar and refractive.  Dorsal esophageal gland nucleus outstanding, other nuclei not observed.  Cardia slender, half as long as body width, extending deep into the thin walled intestine.  Intestinal cells containing scattered, fine, brown granules.  Female prerectum length four to six times body width; rectum slightly longer than anal body diameter.  Lateral pores arranged in single file, with easily visible ducts reaching to the lateral cords, which are only one to two times as wide as the thickness of the adjacent cuticle.  Vulva a transverse slit with cuticularized inner labia.  Cuticle near vulva frequently marked by several deep wrinkles.  Anterior ovary very obscure, rudimentary, its uterus variable in length but sometimes as long as the posterior one.  Posterior ovary normal, generally one right side of body, reflexed one-half to two-thirds the distance back to vulva.  Egg about two and one-half times as long as body width.  Supplements 25-30, usually contiguous, adjacent to the adanal pair.  About eight pairs of caudal papillae.  Spicula and lateral guiding pieces typical of the genus.  A series of about twenty ventromedian organs, each with an obscure duct, is located between the supplements and a point nearly opposite the anterior end of the testis.

Diagnosis: Axonchium with the above measurements and general description.  Distinctive among the larger members of the genus because of the contiguous arrangement of the supplements and the form of the lip region and the anterior female sexual branch.

Habitat: Frequently found in desert, valley, foothill and mountain soils of the Great Basin, Western United States, U.S.A.
(Description- G. Thorne)