Species: agilis OLSON, 1962
Etymology: Latin, agilis, "agile, nimble, quick."

Holotype: FMNH UR 253

Locality: Locality KV, MacFayden Ranch (north), Knox County, Texas.

Horizon: Upper part of San Angelo Formation, Pease River Group.

Biostratigraphy:

Age: Early Late Permian.

Material: Part of the skull, jaws, a lumbar vertebra and fragments of others, part of the left scapula, radius, ulna, pelvis, femur, parts of the tibia and fibula and foot bones.

Referred material:

Locality: Locality KR, Alexander Ranch, Knox County, Texas.

Horizon: Flowerpot Formation.

Biostratigraphy:

Age: Early Late Permian.

Material:

FMNH UR 255: Fragmentary skeleton.