Genus: Sillerpeton LUND, 1978
Etymology:

Species: permianum LUND, 1978
Etymology:
= Phlegethontia cf P. linearis McGINNIS 1967

Holotype: UCMP 62,480

Locality: 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.

Horizon: Willington Formation (Garber Formation), Summer Group, Arbuckle limestone, (Probably equivalent to the Arroyo Formation of Texas).

Biostratigraphy:

Age: Middle Leonardian stage, upper Rotliegendes Epoch, Early Permian.

Material: Braincase.

Referred material:

UCMP 62,580: Braincase.

UCMP 63,835: 2 fused vertebrae.

UCMP 63,831, 63,832, 63,833, 63,834, YPM 3701: Separate vertebrae.