The esophagus is very long, occupying about two thirds of the body length and consists of a thin-walled tube surrounded by large, unicellular glands, the stitchocytes. The entire structure is called a stichosome. The anterior end of the esophagus is somewhat muscular. The transition from the anterior filiform portion of the esophagus and the posterior, stout portion is sudden. Both sexes have a single gonad, and the anus is near the tip of the tail.
Males have a single spicule that is surrounded by a spiny spicule sheath.
The ejaculatory duct joins the intestine anterior to the cloaca. In the female the vulva is near the junction of the esophagus and the intestine. The uterus contains many unembryonated eggs. The excretory system is absent. The ventral surface of the esophageal region bears a wide band of minute pores, leading to underlying glandular and nonglandular cells.