syn.: Mesodorylaimus prerectus Thorne, 1974
1.7 mm; a = 30; b = 5.5; c = 13; V = 47
1.5 mm; a = 35; b = 4.7; c = 70; T = 45
Female tail elongate-digitate, male bluntly rounded, slightly arcuate.
Lips slightly elevated with prominent papillae. Spear 12um
long with aperture occupying 2/5 its length. Guiding ring about 1/4
head width. Esophagus enlarged slightly past middle by gradual expansion.
Cardia discoid, then conoid, about 2/3 as long as body width. Microvilli
not observed. Intestinal cells packed with golden brown granules,
tesellated in posterior portion. Masses of brilliant green material
generally present in intestines. Prerectum length 4 times body width,
rectum twice anal body diameter. Vulva longitudinal, vagina as
illustrated. Uteri forming spermatheca about 3 times as long
as body width, packed with spermatozoa. Ovaries reflexed about 1/2
distance to vulva.
Male prerectum extending 1 to 2 body widths anterior to supplements.
Supplements 14 to 17, closely approximated. Submedian papillae not observed.
Spicula 40um long with simple lateral guiding pieces.
Mesodorylaimus prerectus is immdeidately recognized by the unusually
long prerectum of both sexes.
Habitat: About willow roots, Behrens Ranch, South Dakota
(Description- Thorne, 1974)