Ugrosaurus
| Ugrosaurus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Upper chalk | ||||||||||||
| 68 to 66 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Ugrosaurus | ||||||||||||
| Cobabe & Fastovsky , 1987 |
Ugrosaurus is agenus of pelvic dinosaurs (Ornithopoda) from the group of Ceratopsia knownonly from sparse fossil finds .
From Ugrosaurus only parts of the are so far intermediate jaw bone , the nasal bone and other fragments known. These finds suggest that they belong to the Ceratopsidae , but more precise statements are not possible. Ugrosaurus is therefore considered a nomen dubium .
The fossil remains of this dinosaur were discovered in the Hell Creek Formation in the US state of Montana and first described in 1987 . The generic name is derived from the Scandinavian ugro (= "ugly") and alludes to the uneven structure of the bones that belong to an old and possibly sick specimen. The type species and the only known species is U. olsoni .
Ugrosaurus is dated in the Upper Cretaceous (late Maastrichtian ) to an age of 68 to 66 million years. It is therefore the same age as Triceratops , possibly even the same genus.
literature
- Peter Dodson , Catherine A. Forster, Scott D. Sampson: Ceratopsidae. In: David B. Weishampel , Peter Dodson, Halszka Osmólska (eds.): The Dinosauria . 2nd edition. University of California Press, Berkeley CA et al. 2004, ISBN 0-520-24209-2 , pp. 494-513.
- ↑ Ben Creisler: Dinosauria Translation and Pronunciation Guide ( Memento of October 13, 2011 in the Internet Archive )