Aporcelaimus americanus
Thorne & Swanger, 1936
Photo Gallery- Konza Prairie
Photo Gallery- Rocky Mountain National Park

Female.  a = 45; b = 5.2; c = 100
Male.  a =  41; b = 4.7; c = 100

Cuticle near head in three distinct layer, opposite the base of the spear it generally is thicker than the widest portion of the spear;  lips set off by a deep constriction, the papillae not interfering with the contour of the head;  amphids stirrup-form, more than half as wide as the head;  spear as long as lip region width, the aperture occupying about two-thirds its length;  esophagus enlarged near beginning of middle third, posterior two-thirds massive, one-half to two-thirds the neck width; cardia flat, extending but slightly into the intestine;  female rectum length equal to anal body diameter;  prerectum two and one-half times length of rectum;  ovaries extending half the distance back to the vulva;  eggs as long as the body width and half as wide as long, as many as five occur in each uterus;  supplements 12-15, the posterior being within the range of the spicula, separated by small refractive elements; accessory pieces linear, parallel, the ends minutely cephalated.
Differs from Aporcelaimus regius in the spear form and from A. eurydorys in the thicker, three layered cuticle and arrangement of the supplements.
Habitat:  Soil from woods, Arlington Farm, Virginia, and nursery field, Painesville, Ohio, U.S.A.

(Description- Thorne & Swanger, 1936)

DNA Sequences obtained
Specimen: Collected:
RMNP SS-01 Rocky Mountain National Park
KonzaIII AB-02 Konza Prairie, First survey