Female: 0.8 mm; a = 36; b = 4.3; c =
11.5-13.5; V = 40
Body tapering rather uniformly both ways from near middle. Lip
region about one-fourth as wide as neck base. Tail conspicuously
ventrally arcuate, somewhat hooked. Excretory pore far forward.
Sensillae located three-fourths distance to nerve ring. Esophagus
narrowed slightly at nerve ring, then gradually expanding until three-fifths
the neck width. Egg length about two and one-half times body width.
A developing ovum frequently crowds the short ovary to near the vulva.
Diagnosis: Alaimus with the above measurements
and general description. This species is distinctive becauseof the
arcuate body, short, arcuate tail, long enlarged basal portion of esophagus
and short eggs.
Habitat: Soil of onion field, Ogden, Utah, U.S.A.
Also balsam preserved specimens in the collection of the Division of Nematology,
U.S. Department of Agriculture, collected from soil about roots of plants
imported from Rio de Janeiro, Brazil.
(Description- Thorne, 1939)