Microdorylaimus rapsus
Heyns
Photo Gallery- Konza Prairie

20 females: L = .45 mm +  .07 (.33-.60); w = 28.1 m+ 3.4 (23-35); e = 138 m + 20 (107-185); t = 29.9 m + 4.1 (22-36); a = 16.0 + 2.4 (12.3-21.3); b = 3.24 + .20 (2.85-3.77); c = 15.2 + 2.8 (11.8-19.3); V = 58.6 % + 1.5 (56.6-61.8)

Body slightly curved ventrally or nearly straight when relaxed.  Body diameter increases from lips to base of esophagus 2.3 + .3 times.  Lip width 10.1 um + .4.  Lips set off from body by a weak to fairly strong constriction and moderately separated from each other.  Lips angular with blunt or pointed papillae slightly protruding or not protruding.  Amphids cup-shaped, 4-6 umwide at opening.  Cuticle faintly annulated; thickness at mid-body 1.0 um +  .1.  Cuticle thickness at head same as at mid-body; thickness at tail 2-3 times as great.  Division of cuticle into layers obscure.  Lateral cord width 9 um + 2.
Spear length 11.4 um + .5.  Width of spear 1.3 um + .1.  Spear aperture 31% + 3 of spear length.  Length of spear extension obscure.  Anterior end of guiding sheath ring-like or obscure.  Esophagus enlarges gradually or fairly abruptly between narrow anterior and wide posterior portions; enlargement begins at 36% + 3 of esophagus length from base.  Cardia hemispherical or conical, 3-10 um long.  Intestine 5-6 cells in circumference.  Rectum length 17 m + 3.  Prerectum length 21 um + 4.  Anal body diameter 15 um + 2.  Tail dorsal-convex or arcuate-conical with narrowly rounded to nearly acute tip.  Tail straight or bent ventrally slightly to 90 degrees from body axis.  Two caudal papillae.
Anterior gonad 15% + 3 of body length; posterior 14% + 3.  Gonads reflexed 30-100%.  Vulval labia with triangular sclerotized pieces.  No eggs observed.
Male unknown.
Habitats: All biotic areas of Indiana in woods, and shrubby and grassy areas.