Genus: Arisierpeton REISZ, 2019
Etymology: In honor of Mr. Giuseppe Alberto Arisi, who identiifed this material and made it available for research, and Greek, herpeton, "crawling, creeping."
Species: simplex REISZ, 2019
Etymology: The species epithet refers to the relatively simpler morphology of the marginal dentition than in other Permian caseids.
Holotype: FMNH PR2281: Fort Sill, OMNH Locality V51, Dolese Brothers limestone quarry at Richards Spur, Fissure Fills, just west of U.S. Highways 62 & 281, 10.5 miles south of Apache, 6 miles north of Fort Sill, SW 1/2, Sec. 31, T4N, R11W, Comanche County, Oklahoma.GAA 00225-1
Horizon: Willington Formation (Garber Formation), Summer Group, Arbuckle limestone, (Probably equivalent to the Arroyo Formation of Texas).
Age: Middle Leonardian stage, upper Rotliegendes Epoch, Early Permian.
Material: A nearly complete right premaxilla.
GAA 00207: A left maxillary fragment.
GAA 00239: A right premaxillary fragment.
GAA 00240: A left maxillary fragment with two teeth and fragments of two other teeth.
GAA 00242: A right premaxilla.
GAA 00244: A series of three dorsal vertebrae.
GAA 00246-1: A partial left dentary with eight teeth.
GAA 00246-2: A partial right dentary with 12 teeth or parts of teeth.
GAA 00225-2: A right maxillary fragment.