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Temporal range: Upper Cretaceous 75–67 mya
Hypacrosaurus Royal Tyrrell.jpg
Reconstructed skeleton
Scientific classification
Kingdom: Animalia
Superclass: Sauropsida
Class: Archosauria
Superorder: Dinosauria
Order: Ornithischia
Family: Hadrosauridae
Genus: Hypacrosaurus
Brown, 1913

Hypacrosaurus (meaning "almost the largest lizard") was a large, plant-eating, hollow-crested duck-billed dinosaur similar to Corythosaurus. It was about 30 feet (9 m) long, had almost 40 rows of cheek teeth, and a short toothless beak. A row of long spines from its vertebrae formed a high fin along its back. The fossils are dated as 75 to 67 million years ago.

It is known from the remains of two species in the Upper Cretaceous of Alberta, Canada, and Montana, United States. It is the latest hollow-crested duckbill known from good remains in North America. It was an obscure genus until the discovery in the 1990s of nests, eggs, and hatchlings belonging to one of the species.[1]

References[change | change source]

  1. Horner, John R.; Currie, Phillip J. (1994). "Embryonic and neonatal morphology and ontogeny of a new species of Hypacrosaurus (Ornithischia, Lambeosauridae) from Montana and Alberta". In Carpenter, Kenneth; Hirsch, Karl F.; Horner John R. (eds.). Dinosaur Eggs and Babies. Cambridge: Cambridge University Press. pp. 312–336. ISBN 0-521-56723-8.