[1] 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.

Feeserpeton has a large opisthotic bone in its braincase, similar in size to that of another Early Permian parareptile called Acleistorhinus.

[1] The holotype skull of Feeserpeton, cataloged as OMNH 73541, was found in the Dolese Brothers Limestone Quarry near the town of Richard's Spur, Oklahoma.

Feeserpeton was found to be a basal member of this group, the sister taxon of a clade including Acleistorhinus and Lanthanosuchus.

Below is a cladogram from the analysis showing the position of Feeserpeton:[1] Seymouria Limnoscelidae Diadectidae Synapsida Captorhinidae Paleothyris Araeoscelidia Younginiformes Mesosauridae Eunotosaurus Millerettidae Microleter Australothyris Feeserpeton Lanthanosuchus Acleistorhinus Nyctiphruretus Eudibamus Belebey Macroleter Bashkyroleter bashkyricus Bashkyroleter mesensis Nycteroleter Emeroleter Rhipaeosaurus Bradysaurus Pareiasuchus Scutosaurus Procolophon Owenetta Barasaurus