Body tapering both ways from near middle. Tail conoid, slightly
arcuate with an acute terminus. Vestibule minute. Esophagus
at first three-fifths as wide as neck, gradually narrowing until at the
nerve ring it is one-fifth the neck width, then finally enlarging by a
gradual expansion until the basal fourth or fifth is about three-fifths
as wide as the neck. Excretory pore far forward. Cells of anterior
intestines with fine colorless granules for a short distance, then they
contain a few large, scattered, refractive, light brown granules.
These large granules disappear a short distance in front of the rectum,
giving the intestine at that point something of the appearance of a prerectum.
Rectum shorter than anal body diameter. Ovary reflexed to near vulva.
Eggs five times as long as body width, distending the body somewhat.
Diagnosis: Alaimus with the above measurements and general description. Distinctive because of its small size combined with the form of the tail and esophagus, and the relative positions of the excretory pore and sensillae.
Steiner reports a speciment of Alaimus primitivus, length 0.606 mm; a = 33.7; b = 3.7; c = 8.2; V = 43.9%. This may have been A. parvus.
Habitat: Cultivated fields near Salt Lake City and Salem,
(Description- Thorne, 1939)
DNA Sequences Obtained
|KonzaV EE-130||Konza Prairie, First Survey|