Genus: Gryposaurus LAMBE, 1914
Etymology: Greek, grypos, “crokked, hook-nosed”, and Greek, sauros, “lizard”: “Hooked-nosed lizard”.

Species: notabilis LAMBE, 1914

Referred material:

HEATON, 1972






ROM 873 (old number 5759): Skull with skin impression on right jugal.


= Trachodon marginatus LAMBE, 1902 (nomen dubium; partim)

Holotype: NMC 419

Locality: Near Steveville, Dinosaur Provincial Park, Red Deer River, Alberta Province, Canada, Late Cretaceous.

Horizon: Dinosaur Park Formation, upper Judith River Group.


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

Material: Humerus, ulna, radius, metatarsal, and phalanges of pes, zygapophyses of cervical vertebrae, ribs, fragments of teeth, ossified tendons, impressions of integument, disassociated femora, tibiae, metacarpals, and phalanges of manus, rami of the lower jaw, maxillae with teeth, dorsal and caudal vertebrae, pubis, ischia, ilia, chevrons and teeth.


Species: monumentensis GATES & SAMPSON, 2007
Etymology: In reference to the Grand Staircase-Escalante National Monument in southern Utah, where all referred material of this species have been recovered.
= Species: Nova GATES & SAMPSON, 2006

Locality: Grand Staircase-Escalante National Monument, south-cental Utah.

Horizon: Kaiparowits Formation.


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

Referred material:

UMNH VP 12265: Partial skull and skeleton preserving both maxillae, left dentary, left quadrate, and partial jugal, left humerus, right and left scapulae, right coracoid, multiple ribs, both ilia, pubes, and ischia, most of the dorsal, sacral, and caudal series, including skin impressions on the right side of the vertebral series.