Arrhinoceratops
| Arrhinoceratops | ||||||||||||
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Skull of Arrhinoceratops |
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| Temporal occurrence | ||||||||||||
| Upper Cretaceous (early Maastrichtian ) | ||||||||||||
| 72 to 69.9 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Arrhinoceratops | ||||||||||||
| Parks , 1925 | ||||||||||||
| Art | ||||||||||||
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Arrhinoceratops is a genus of pelvic dinosaurs from the group of Ceratopsidae within the Ceratopsia .
features
From arrhinoceratops only one has so far skull without the lower jaw known, presumably but his physique is broadly in line with that of the other Ceratopsidae. The snout was pointed and resembling a parrot's beak, and there were tooth batteries in the mouth, teeth arranged in rows that were replaced by the next tooth when they were worn out. Like all Ceratopsia, this dinosaur was a herbivore; the teeth are an adaptation to hard, fibrous plants.
The horn on the nasal bone was extremely short and blunt, the upper-eye horns were long and slightly curved forward. The neck shield typical of the Ceratopsidae was formed from the parietal and scaled bones , it was elongated and had two paired openings. The function of the horns and neck shields in the Ceratopsidae is seen today primarily in the contact and interaction with conspecifics and less in the defense against predators.
Discovery and naming
The fossil remains of Arrhinoceratops were found in the Horseshoe Canyon Formation in Alberta ( Canada ) and first described by William Parks in 1923 . The generic name means “noseless horn face” in the Greek language and alludes to the small nasal horn. Type species is A. brachyops . The finds come from the Upper Cretaceous (early Maastrichtian ) and are around 72 to 69 million years old.
Systematics
Arrhinoceratops is classified within the Ceratopsidae in the Chasmosaurinae , which were characterized by long over-eye horns and a mostly long neck shield. Its sister taxon is likely to be Anchiceratops .
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.
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 , pp. 267-268, online .