Cuticle occupying almost half the neck width in the latitude of the spear, marked by criss-cross fibers.  Lateral pores in two lines.  A series of about 80 ventromedian pores on both sexes, distributed throughout the length of the body but most closely arranged on the neck where about 30 occur.  A similar dorsomedian series, 11 on female and 14 on male, is located between the head and nerve ring.  Details of lips, amphids and spear shown in figure 26.  Esophagus enlarged in posterior two-thirds until half the neck width; cardia hemispherical; intestine packed with fine granules.  Female prerectum length equal to body diameter, male prerectum extending almost as far as supplement series.  Supplements 8, located well in front of spicula, separated by spaces 2 to 3 times as wide as the posterior segments.  Lateral guiding pieces furcate.

Aporcelaimus pachydermus is distinctive because of the long spear aperture (similar to that of A. regius), arrangement of supplements (similar to those of A. americanus) and the slightly arcuate, clavate spicula with angular distal extremities of the posterior segments.

Habitat:  Two specimens, a male and a female, were collected in Lincoln county, Mississippi, U.S.A., by W.F. Turner and submitted to the Division of Nematology by Mr. C.F.W. Muesebeck of the U.S. Bureau of Entomology and Plant Quarantine.  Both specimens were somewhat shrunken so the neck measurements here given are shorter and the widths are greater than they actually are.
(Description- Thorne, 1937)