Species: broilii WILLISTON, 1910
Etymology:

Holotype: FMNH UC 656

Locality: Indian Creek, Baylor County, Texas.

Horizon: Uppermost Arroyo, Clear Fork Group or Lower most Vale Formation, Wichita Group.

Biostratigraphy:

Age: Lower Leonardian, Hessian, Artinskian Stage, Lower Rotliegendes Epoch, or Leonardian stage, upper Rotliegendes or lower Guadelupian Epoch, Early Permian.

Material: Skull and skeleton.

Referred material:

FMNH UC 657: Right hind foot.

FMNH UC 698: Skull.

FMNH UC 883: Fragmentary skeleton.

FMNH UC 901: Partial skeleton.

FMNH UC 960: A nearly complete articulated vertebral column.

FMNH UC 10011: Lower part of skull and part of lower jaws.

BRINK, 1982

FMNH UC 655: Much of a postcrainal skeleton.

FMNH UC 658: Vertebrae.

FMNH UC 900: Vertebrae, pelvis, fragments of skeleton.

LeBLANC & REISZ, 2014

FMNH UR 2512: 2 posterior dorsal, 3 sacrals, and two anterior caudal vertebrae, complete left pelvic girdle, a left femur, tibia and fibula and the left astragalus of a juvenile.

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Species: nicholsi OLSON, 1954
Etymology:

Holotype: FMNH UR 86

Locality: Locality KC, Knox County, Texas.

Horizon: Upper part of Vale Formation, Clear Fork Group.

Biostratigraphy:

Age: Lower Leonardian, Hessian, Artinskian Stage, Lower Rotliegendes Epoch, Early Permian.

Material: Part of basicranium and lower jaw, largely impression, and skeleton, including much of column except tail, part of pelvis, forelimb with humerus poorly preserved, and part of hind foot.

Referred material:

CNMH UR 85: Posterior part of skull, skeleton, including much of vertebral column except caudals, part of shoulder girdle, pelvis, femur, and head of fibula.

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Species: halselli OLSON, 1954
Etymology:

Holotype: FMNH UR 117

Locality: Locality FC, Halsell Ranch, Foard County, Texas.

Horizon: Middle part of Choza Formation, Upper Clear Fork Group.

Biostratigraphy: Land-vertebrate faunachron middle D.

Age: Upper Leonardian Stage,Upper Rotliegendes Epoch, Early Permian.

Material: Pelvic girdle with ilium damaged, partial left femur and tibia, head of right femur, 5 caudal vertebrae lacking arches, and fragments of lumbar vertebrae.
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