Eotriceratops
| Eotriceratops Temporal range: Late Cretaceous,
| |
|---|---|
| |
| Restoration | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Ceratopsia |
| Family: | †Ceratopsidae |
| Subfamily: | †Chasmosaurinae |
| Tribe: | †Triceratopsini |
| Genus: | †Eotriceratops Wu et al., 2007 |
| Species: | †E. xerinsularis
|
| Binomial name | |
| †Eotriceratops xerinsularis Wu et al., 2007
| |
Eotriceratops (meaning "early Triceratops") is a genus of ceratopsian dinosaur which lived during the late Cretaceous period. Its fossils have been found in the uppermost Horseshoe Canyon Formation, dating to about 67.6 million years ago. Its skull is reported to have been around 3 metres (10 ft) long.[1] It has been estimated that it had a total length of about 9 meters (30 ft).[2]
Eotriceratops was described by Xiao-Chun Wu, Donald B. Brinkman, David A. Eberth and Dennis R. Braman in 2007 and the type species is E. xerinsularis.[1]
Description
Eotriceratops is known from a single incomplete skeleton found disarticulated in Dry Island Buffalo Jump Provincial Park in southern Alberta, Canada. The skeleton consisted of a partial skull including parts of the frill, large horns above the eyes, and a small horn above the nose, similar to the closely related Triceratops. Several neck and back vertebrae, as well as several ribs, were also recovered. Because the specimen was found in weakly bedded shale, many of the bones were badly crushed.[1] It differs from other chasmosaurine ceratopsians in unique features of the skull bones, such as an unusually pronounced jugal horn and extremely elongated, flattened and spindly epoccipitals (the bones lining and often protruding from the edge of the frill), similar to Torosaurus utahensis. Most distinctively, Eotriceratops had a pronounced vertical process on its premaxilla where it contacted the nasal bones not seen in its relatives; though some Triceratops specimens have a similar process, it is not as tall.[1] The horns above the eyes were forward-curving and about 80 centimetres (2.6 ft)* long. There appeared to have been bite marks above the eye, near the base of the left horn.[1]
References
- ^ a b c d e Wu, X-C., Brinkman, D.B., Eberth, D.A., and Braman, D.R. (2007). "A new ceratopsid dinosaur (Ornithischia) from the uppermost Horseshoe Canyon Formation (upper Maastrichtian), Alberta, Canada." Canadian Journal of Earth Science, 44(9): 1243-1265.
- ^ Holtz, Thomas R. Jr. (2008). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages (PDF). Random House. pp. 52, updated appendix. ISBN 0375824197.