Genus: Mastersonia OLSON, 1962
Etymology: In honor of Mr. And Mrs. Thomas Masterson, who aided Olson and his team in collecting fossil in Texas.

Species: driverensis OLSON, 1962
Etymology:

Holotype: FMNH (CNHM) UR 486

Locality: Loc. KY, Driver Ranch, Knox County, Texas.

Horizon: Member?, Middle San Angelo Formation, Lower Pease River Group.

Biostratigraphy: Land-vertebrate faunachron lower E.

Age: Lower Guadalupian Stage, Upper Rotliegendes Epoch, Early Permian.

Material: Parts of 3 vertebrae, and several ribs.