Digestive System of Trichodorus porosus

The onchiostyle of Trichodorus porosus has an anterior outer portion, a fine inner spear and a posterior onchiostyle extension. The extension has a ventral lumen and is fused to the pharynx wall. The inner spear enters the dorsal wall of the outer onchiostyle posterior to the guide ring and extends anteriorly inside the anterior portion of the onchiostyle. Muscle cells are absent in the basal position of the esophagus. The glandular portion of the basal part of the esophagus consists mainly of endoplasmic reticulum lined with ribosomes. A sinus empties into the lumen through the dorsal esophageal gland orifice. The configuration of the intesinal lumen is highly variable. The rectum is attached to the dorsal and ventral walls of the body cavity by striated rectal muscle cells.