Description (from Thorne, 1974)
Body robust, slightly arcuate. Lip region 1/4 width of neck base. Cuticle near head greatly thickened. Spear 22 um long, with aperture occupying slightly more than half its length. Esophagus enlarged very gradually from near middle. Cardiac disc prominent, cardia slightly concave conoid, completely surrounded by intestinal cells. Vulva with massive sclerotized labia. Ovaries reflexed about halfway to vulva. Prerectum length about twice body width. Tail dorsally convex conoid to blunt rounded terminus. Cuticle in 2 thick layers with exceedingly coarse radial striae. Only 1 male collected, similar to those of other species of the genus. Supplements 8, mammiform, irregularly spaced.
Aporcelaimellus porcus is distinctive because of the intestinal cells surrounding the cardia, and strong radial striae of the dorsally arcuate rounded tails.
Habitat: Cultivated field, Highmore Experiment Station, South Dakota.