Hypacrosaurus

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Hypacrosaurus
Fossil range: Late Cretaceous

Extinct (fossil)

Scientific classification

Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Ornithischia
Suborder:	Ornithopoda
Infraorder:	Iguanodontia
Superfamily:	Hadrosauroidea
Family:	Hadrosauridae
Subfamily:	Lambeosaurinae
Tribe:	Lambeosaurini
Genus:	Hypacrosaurus Brown, 1913

Species

H. altispinus
H. stebingeri Horner & Currie, 1993

Hypacrosaurus ("very-high-lizard") was a hadrosaur similar in appearance to Corythosaurus. Like Corythosaurus, it had a domed crest, though at the time it was named its skull was unknown. This crest differs from that of Corythosaurus in that it is narrower, lower, and less rounded in shape. A large hadrosaur, it measured approx. 9 meters in length. It is known from the Early Maastrichtian (Late Cretaceous) of Canada and Montana.

The new species Hypacrosaurus stebingeri was named for various hatchlings with associated eggs and nests found in the Two Medicine Formation in Glacier Creek, Montana. These represent the largest collection of baby skeletal material of any single species of hadrosaur known.