Jaxartosaurus
| Jaxartosaurus | ||||||||||||
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| Temporal occurrence | ||||||||||||
| Upper Cretaceous ( Coniacium to Santonium ) | ||||||||||||
| 89.7 to 83.6 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Jaxartosaurus | ||||||||||||
| Riabinin , 1937 |
Jaxartosaurus is a little-known dinosaur from the hadrosaur family, which is only known by a single skullcap including a brain skull. The only valid species is Jaxartosaurus aralensis . The second species described, J. fuyunensis, is considered the noun dubium .
Jaxartosaurus had a shortened, laterally arched frontal bone . The frontal bone, the prefrontal and the lacrimal bone were grooved to form a base for the nasal bone, as in other hadrosaurs. The frontal bone was not part of the anterior border of the eye socket . The skull crest typical of hadrosaurs was extremely short.
literature
- John R. Horner , David B. Weishampel , Catherine A. Forster: Hadrosauridae. 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. 438-463.