Hypacrosaurus
Hypacrosaurus (meaning "almost the largest lizard") was a large, plant-eating, hollow-crested duck-billed dinosaur similar to Corythosaurus.
| Hypacrosaurus Temporal range: Upper Cretaceous 75–67 mya
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| File:Hypacrosaurus Royal Tyrrell.jpg | |
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| Genus: | Hypacrosaurus Brown, 1913
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The adults were about 30 feet (9 m) long. Their teeth were continually replacing, and packed into dental batteries that contained hundreds of teeth. Only a relative handful of teeth were in use at any one time. They had a short toothless beak.
A row of long spines from their vertebrae formed a high fin along the back. The fossils are dated as 75 to 67 million years ago.
Remains have been found 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. In the 1990s nests, eggs, and hatchlings of one of the species was found.[1]
Hypacrosaurus Media
Skeletal mount of H. altispinus at Canadian Museum of Nature
- Hypacrosaurus stebingeri holotype.jpg
H. stebingeri holotype skull
- Hypacrosaurus Size.svg
Size comparison between the two species and a human
- Life reconstruction of Hypacrosaurus altispinus.png
Life restoration of H. altispinus
Hindfoot of H. altispinus
- Philip J. Currie Hypacrosaurus.jpg
Hypacrosaurus mount at the Philip J. Currie Dinosaur Museum
- Hypacrosaurus altispinus - AMNH - DSC06304.JPG
H. altispinus skull, AMNH
- Hypacrosaurus stebingeri nest.jpg
5d-dinosaur-camp-day2-20120802-59.jpg
- Hypacrosaurus & emu chondrocytes.jpeg
Hypacrosaurus MOR 548 supraoccipital with microscopic magnification showing the preserved chondrocyte-like structures, in comparison to those of an emu
- Hypacrosaurus altispinus.jpg
Restoration of H. altispinus in environment
References
- ↑ 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.
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