Aporcelaimellus dubius
Andrassy, 1986
Synonym: Eudorylaimus dubius Thorne, 1974
Photo Gallery-Konza Prairie

Measurements (from Thorne, 1974)
L = 0.8 mm; a = 24; b = 3.9; c = 24; V = 60

Description (from Thorne, 1974)
    Body practically straight when relaxed.  Lateral field about 1/3 body width.  Cuticle with minute radial striae.  Lip region angular with prominent papillae, set off by constriction.  Spear about 11 um long and 3 um wide with aperture occupying 2/3 its length.  Pharynx 1/3 head width, the guiding ring about opposite the constriction setting off the lips.  Esophagus enlarged in posterior 2/5 by rather abrupt expansion.  Cardia elongate-hemispheroid, almost 1/3 body width.  Vulva transverse with vagina walls merging with cuticle and no sclerotization.  Ovaries sometimes crowded back to vulva by developing oocytes.  Prerectum length 2 to 3 times body width.  Tail dorsally convex-conoid to blunt terminus.  One pair of caudal pores observed.
    Habitat: From cultivated fields and prairie sod near Brookings, Parker, Mitchell and Rapid City, South Dakota.

-Thorne notes that Eudorylaimus dubius is distinctive among the small species by the long aperture of the broad spear.  In this characteristic it resembles an Aporcelaimellus.