Ankylopollexia Cerapoda Dinosauria Genasauria Hadrosauridae Hadrosauriformes Hadrosauroidea Hadrosauromorpha Iguanodontia Kritosaurini Late Cretaceous Neornithischia North America Ornithischia Ornithopoda Saurolophinae Styracosterna

Gryposaurus monumentensis

Dinosaur: Gryposaurus monumentensis

Cretaceous: 83.6–72.1 Ma

TRIASSIC

JURASSIC

CRETACEOUS

252

201

145

Type: Ornithopod

*Length:**	7.3 m	24.0 ft
*Weight:**	2.3 tons	5,071 lb

ESR: 2 / 4 (estimated size reliability)
*The largest known specimen

Area: North America

Period

Epoch: Late Cretaceous
Stage: Late Campanian
Years: 83.6–72.1 Ma

Details

Status: valid
Author: Gates & Sampson
Year: 2007

Distribution

Area: North America
Country: USA
Region: Utah
Formation: Kaiparowits

Classification

Dinosauria
Ornithischia
Genasauria
Neornithischia
Cerapoda
Ornithopoda
Iguanodontia
Ankylopollexia
Styracosterna
Hadrosauriformes
Hadrosauroidea
Hadrosauromorpha
Hadrosauridae
Saurolophinae
Kritosaurini

Sources

Material: Skull, referred subadult skull and partial skeleton with skull.
References: GATES, T. A., & SAMPSON, S. D. (2007). A new species of Gryposaurus (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, USA.