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Description (from Thorne, 1974)
Body slightly arcuate. Anterior end set off
by slight narrowing of neck. Cuticle of anterior end very thick,
in two distinct layers. Spear
18
um long, the aperture occupying slightly more than 1/2 its length.
Esophagus enlarged by very gradual expansion. Cardiac disc irregular
in thickness. Cardia elongate conoid, enveloped by cells of anterior
intestine. Vulva with massive, sclerotized labia. Ovaries reflexed
3/4 distance back to vulva. Eggs 1 1/2 times as long as body width
and half as wide as long. Tail
uniformly conoid to blunt rounded terminus with cuticle in two distinct
layers, the inner one with strong radial striae. A single male bore
10 flat, elongated supplements.
Aporcelaimellus clamus is immediately distinguished
from A. porcus by its uniformly conoid tail. Both species
have the cardia surrounded by intestinal cells.
Habitat: Cultivated fields near Presho and
Chamberlain, South Dakota.