Species: ultimus BROWN, 1913
Etymology:

Holotype: AMNH 5261

Locality: Near Drumheller, Alberta Province, Canada.

Horizon: Horseshoe Canyon Formation, Edmonton Group.
Biostratigraphy:

Age: Edmontonian age, lower Maastrichtian Stage, Upper Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: 12 cervicals, 18 dorsals, 5 caudal vertebrae, 30 ribs, 7 abdominal ribs, coracoids, scapulae, humeri, ilia, ischia, pubes, femora, 3 epipodials, 7 meso-and metapodials and 15 phalanges.

Note: From freshwater

Referred material:

RUSSELL

Locality: North Saskatchewan river, 6 miles above Edmonton, Alberta Province, Canada.

Horizon: Horseshoe Canyon Formation, Edmonton Group.
Biostratigraphy:

Age: Edmontonian age, lower Maastrichtian Stage, Upper Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

University of Alberta: Centra.

Note: From freshwater.

 

TANKE pers. Com.

Locality: 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:

RTMP: Fragmentary skeleton.