Species: dakotensis (ERICKSON, 1987) BROWNSTEIN, 2022
Etymology: In reference to North Dakota.

Holotype: SMM P76.10.1

Locality: SE 1/2 Sec. 16, T 138 N, R 84 W, Morton County, North Dakota.

Horizon: Slope Formation.

Biostratigraphy:

Age: Paleocene Epoch, Early Paleogene Period, Early Tertiary Sub-era, Cenozoic Era.

Material: Skull, partial dentary and partial skeleton.

Referred material:

Locality: "Brisbane" locality of Holtzman, North Dakota.

Horizon:

Biostratigraphy:

Age:

Material:

SMM P77.8.284, SMM P78.12. 1: Vertebra centra.

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Species: magnicornis BROWNSTEIN, 2022
Etymology: Latin, magnus, "large" and Latin, cornum, "horn.", referring to the particularly large squamosal spines found on the species.

Holotype: YPM YPPU 19168

Locality: Fritz Quarry, NE 1/4 Sec. 30, T. 57 N., R. 100W, Park County, Wyoming.

Horizon: Silver Coulee beds horizon, Polecat Bench Formation.

Biostratigraphy:

Age: Late Tiffanian Stage, Late Paleocene Epoch, Early Paleogene Period, Early Tertiary Sub-era, Cenozoic Era.

Material: Nearly complete articualted skull, poriton of dentary, scapula, coracoid, adn associated cranial and postcranial fragments.

Referred material:

Locality: NW 1/4 Sec. 26, T. 58 N, R. 101 W, Park County Wyoming.

Horizon: Silver Coulee beds horizon, Polecat Bench Formation.

Biostratigraphy:

Age: Late Tiffanian Stage, Late Paleocene Epoch, Early Paleogene Period, Early Tertiary Sub-era, Cenozoic Era.

Material:

YPM VPPU 18724: Articualted partial skull, both mandibles, 34 vertebrae in various states of articulation, and fragments.