Dysganus
| Dysganus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Upper chalk | ||||||||||||
| 75 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Dysganus | ||||||||||||
| Cope , 1876 |
Dysganus is a known only by tooth finds genus of Vogelbeck dinosaurs (ornithopoda) from the group of Ceratopsidae .
Four species were by Edward Drinker Cope in 1876 described : D. bicarinatus , D. encaustus , D. haydenianus and D. peiganus . A more detailed systematic investigation is not possible. All species are considered nomina dubia , which means that the finds are too sparse for a more precise classification. The generic name means "rough tooth enamel ".
The finds come from the Judith River Group in the US state of Montana and are dated in the Upper Cretaceous to an age of around 75 million years.
After Agathaumas and Polyonax , Dysganus was the third genus of Ceratopsia described by Cope, but all of them were extremely sparsely preserved. More precise ideas about the appearance of these animals could only be recognized around 15 years later with the discovery of Triceratops .
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.