Corythosaurus
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Corythosaurus Temporal range: Late Cretaceous, 77–75.7 Ma |
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| ROM 845, mounted skeleton of Corythosaurus cf. intermedius cf. excavatus Parks 1935 at the Royal Ontario Museum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Suborder: | †Ornithopoda |
| Family: | †Hadrosauridae |
| Tribe: | †Lambeosaurini |
| Genus: |
†Corythosaurus Brown, 1914 |
| Type species | |
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†Corythosaurus casuarius Brown, 1914 |
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| Species | |
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Corythosaurus casuarius |
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| Synonyms | |
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List
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Corythosaurus casuarius
Brown, 1914 (type)
Corythosaurus intermedius
(Parks, 1923 [originally Stephanosaurus])
Corythosaurus /ˌkɒrᵻθoʊˈsɔːrəs/ is a genus of hadrosaurid "duck-billed" dinosaur from the Upper Cretaceous Period, about 77–75.7 million years ago. It lived in what is now North America. Its name means "helmet lizard", derived from Greek κόρυς. It was named and described in 1914 by Barnum Brown. Corythosaurus is now thought to be a lambeosaurine, related to Nipponosaurus, Velafrons, Hypacrosaurus, and Olorotitan. Corythosaurus has an estimated length of 9 metres (30 ft), and has a skull, including the crest, that is 70.8 centimetres (27.9 in) tall.
Corythosaurus is known from many complete specimens, including the nearly complete holotype found by Brown in 1911. The holotype skeleton is only missing the last section of the tail, and part of the forelimbs, but was preserved with impressions of polygonal scales. Corythosaurus is known from many skulls with tall crests. The crests resemble the crests of the cassowary and a Corinthian helmet. The most likely function of the crest is thought to be vocalization. As in a trombone, sound waves would travel through many chambers in the crest, and then get amplified when Corythosaurus exhaled. A Corythosaurus specimen has been preserved with its last meal in its chest cavity. Inside the cavity were remains of conifer needles, seeds, twigs, and fruits: Corythosaurus probably fed on all of these.
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