Alaimus arcuatus
Thorne, 1939
Photo Gallery- Konza Prairie

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.
DiagnosisAlaimus 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)