The only known skull of Feeserpeton is small, but well-fused bones, deep pitting, and worn teeth indicate that the individual was close to maturity when it died. Large eye sockets may indicate that Feeserpeton was nocturnal. The skull is nearly complete, missing parts of the premaxilla (a bone at the tip of the snout) and the jugal (a bone making up the "cheek" region). A combination of features distinguish Feeserpeton from other related parareptiles, including a triangular skull, large caniniform teeth in the upper and lower jaws, and postorbital bones behind the eye sockets that are much larger than the nearby squamosal bones. Part of the palate is exposed on the right side of the skull, revealing many worn palatal teeth. The teeth in the mandible or lower jaw are hidden beneath the bone