The males measure 1.4 to 1.6 mm long and are more slender at the anterior than the posterior end. The anus is nearly terminal and has a large papilla on each side of it. A copulatory spicule is absent. Stichocytes are arranged in a row following a short muscular esophagus.
Females are about twice the size of males, also tapering toward the anterior end.
The anus is nearly terminal. The vulva is located near the middle of the esophagus, which is about a third the length of the body. The single uterus is filled with developing eggs in its posterior portion, whereas the anterior portion contains fully developed, hatching juveniles. Historical Trichinosis in man is associated with the consumption of pork products, particularly uncooked or insufficiently cooked pork. The worm was first reported in man in 1835 and was first recorded in the United States in 1846.