Hongshanosaurus
| Hongshanosaurus | ||||||||||||
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Speculative reconstruction of Hongshanosaurus , based on Psittacosaurus |
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| Temporal occurrence | ||||||||||||
| Lower Cretaceous (Lower Aptium ) | ||||||||||||
| 126.3 to 123 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Hongshanosaurus | ||||||||||||
| You, Xu , & Wang, 2003 | ||||||||||||
| Art | ||||||||||||
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Hongshanosaurus is a little-known genus of pelvic dinosaur from the group of Ceratopsia . It is closely related to Psittacosaurus and forms with it the Psittacosauridae .
The holotype of Hongshanosaurus is the skull of a young animal, which is almost completely preserved. In addition, the approximately 20 centimeter long skull of an adult animal is known, which roughly corresponds to the larger representatives of Psittacosaurus . It differs from its well-known relative in that the part of the skull in front of the eye socket makes up half the length of the skull, that the nasal and eye sockets are elliptical and that the lower skull window of the temporal region is directed backwards and downwards ( caudodorsal ). Nothing is known about the rest of the body structure of this dinosaur, possibly it moved like Psittacosaurus mainly on two legs ( biped ). Like all Ceratopsia, it was herbivorous.
The Hongshanosaurus finds come from the Yixian Formation in the Chinese province of Liaoning and were first described in 2003. The genus name alludes to the Neolithic Hongshan culture , type species and the only known species is H. houi . The dating of this formation is controversial. The fossil comes from the Lower Cretaceous , probably from the early Aptian, and is therefore around 126 to 123 million years old.
After a comparison of the skull morphology, Hongshanosaurus was synonymous with Psittacosaurus lujiatunensis in mid-2013 , since the apomorphies of the genus can be explained by the dorsoventral crushing of the skull.
swell
- Hailu You, Xing Xu , Xiaolin Wang: A new genus of Psittacosauridae (Dinosauria: Ornithopoda) and the origin and early evolution of marginocephalian dinosaurs. In: Acta Geologica Sinica. English edition. Vol. 77, No. 1, 2003, ISSN 1000-9515 , pp. 15-20, doi : 10.1111 / j.1755-6724.2003.tb00105.x .
- Hailu You, Xing Xu: An adult specimen of Hongshanosaurus houi (Dinosauria: Psittacosauridae) from the Lower Cretaceous of Western Liaoning Province, China. In: Acta Geologica Sinica. English edition. Vol. 79, No. 2, 2005, pp. 168-173, doi : 10.1111 / j.1755-6724.2005.tb00879.x .
Web links
Individual evidence
- ^ Gregory S. Paul : The Princeton Field Guide To Dinosaurs. Princeton University Press, Princeton NJ et al. 2010, ISBN 978-0-691-13720-9 , p. 245, online ( memento of the original of July 13, 2015 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. .
- ↑ Brandon P. Hedrick, Peter Dodson : Lujiatun Psittacosaurids: Understanding Individual and Taphonomic Variation Using 3D Geometric Morphometrics. In: PLoS ONE . Vol. 8, No. 8, 2013, e69265, doi : 10.1371 / journal.pone.0069265 .
