Category: Dinosaur

Gryposaurus (Grip-o-sore-us), Hook nosed lizard, lived in the Late Cretaceous of Campanian North America. Gryposaurus was a hadrosaurine closely related to Kritosaurus. Hadrosaurs are duck billed dinosaurs that were very successful in the Late Cretaceous in Laurasia and spreading to South America in the Early Maastrichtian. They mostly lacked solid head crests but some had fleshy crests known for rare mummified fossils.



Genera and Species

Classification: Ornithopoda, Iguanodontia, Hadrosauroidea, Hadrosaurine

Species: G. notabilis, G. incurvimanus, G. latidens, G. monumentensis

Senior synonyms: Hadrosaurus notabilis,Kritosaurus notabilis, K. marginatus, Pteropelyx marginatus, Thespesius marginatus and Trachodon marginatus.


Gryposaurus a plant eater with a long shallow crest ridge over nasal opening. The front of the jaw had a toothless beak made of keratin. The jaws contained complex batteries of teeth design to process plants before it was swallowed. The feet were fleshy pads around the fingers.


LENGTH: 7.5 m (25 ft).

WEIGHT: 2.5 tons.


It lived in herds like other hadrosaurs. Hadrosaurs are known to have nested is large groups and provided parental care. They were able to browse at a higher level than the horned dinosaurs or other smaller herbivores.

History of Discovery

Discovered by Lambe, 1914, known from 10 complete skulls, partial skulls, skin impressions and skeletal remains.


Found in North America in dry upland forests.


1. Paul, G. (2010). The Princeton Field Guide to Dinosaurs (pp. 6828). Princeton, New Jersey: University Press Princeton.

2. Worth, G. (1999). The Dinosaur Encyclopaedia (pp. 1068). Scarborough, Western Australia: HyperWorks Reference Software.

3. Griffin. (2010, July 9). Gryposaurus.

4. Knol, R. (2012). Late Cretaceous Edmontonian Horseshoe Canyon Formation.