Species: walkeri PARKS, 1922 (Male)
Etymology:

Holotype: ROM 768 (old GSC 4578)

Locality: Quarry 12, On the middle branch of the coulee below Sand Creek, Red Deer River, elevation of 125 feet (aneroid) above the river, Dinosaur Provincial Park, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material: Skull, dentary and skeleton missing lower legs and tail.
Note: Paleopathology, neural spindes of dorsals V, VI and VII are pathologic (LULL & WRIGHT, 1942, BERTOZZO, MANUCCI, DEMPSEY, TANKE, EVANS, RUFFELL & MURPHY, 2020).

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Species: cyrtocristatus OSTROM, 1961 (Female)
Etymology:

Holotype: FNHM P27393

Locality: Near Coal Creek, 8 miles southeast of Tsaya, McKinley County, New Mexico.

Horizon: Fruitland Formation.

Biostratigraphy:

Age: Judithian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Complete cranial crest and dorsal-caudal part of the cranium, fragmentary left dentary, 3 cervical, 11 dorsal, 8 sacral, and 26 caudal vertebrae, both scapulae and humeri, right radius, fragmentary left radius, right ulna, fragmentary left ulna, both ischia, ilia, pubes, femora, and tibiae, left fibula, incomplete right fibula, and numerous ribs, chevrons and phalangeal elements.
Note: Paleopathology, left fibula has a healed fracture.