Species: pholeter VAUGHN, 1958
Etymology:

Holotype: FMNH 272

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: Fragmentary skull.

Referred material:

OMNH 55927: A partial right maxilla.

ROM 26108: Fragmentary left maxilla.

MODESTO & REISZ, 2007, 2008

OMNH 73535: Fragmentary skull.

Composite skull modifed from MODESTO & REISZ, 2008.

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Species: vaughni MacDOUGALL, MODESTO & REISZ, 2016
Etymology: In honor of Peter Vaughn for his contributions to the paleontology of late Paleozoic vertebrates.

Holotype: UWBM 96304

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: A partial skull with a few disarticulated cranial and postcranial elements.