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 bones of the upper jaw, but ct scanning has revealed that there is a single tooth row on each side with mostly small teeth. two teeth are much larger than the rest, similar in size to the enlarged caniniforms of the upper jaw. the braincase is preserved at the back of the skull and includes the stapes, a bone rarely preserved in parareptile fossils. "feeserpeton" has a large opisthotic bone in its braincase, similar in size to that of another early permian parareptile called "acleistorhinus".