Ilokelesia
- Argentina ( Huincul Formation)
- Ilokelesia aguadagrandensis
Ilokelesia is a genus theropod dinosaur from the group of Abelisauridae. So far, only a very fragmentary Fund is known, the dates of the Argentine Huincul - formation from the early Late Cretaceous (Upper Cenomanian ). The only way is Ilokelesia aguadagrandensis.
The name Ilokelesia comes from the language of the Mapuche ( ilo - "meat", kelesio - " lizard" ) and is intended to indicate a carnivorous reptile. The second part of the species name, aguadagrandensis, has the locality Aguada Grande.
Features
Ilokelesia was a medium-sized theropod. From related genera can this genus based on the anatomy of the square leg and the cervical, dorsal and caudal vertebrae delimit. Thus, the cervical vertebrae were, for example, viewed from the side rather than square rectangular.
System
Ilokelesia
In the first description of Coria and Salgado (1998) this species is described as a basal (original ) Representatives of Abelisauria, a group within the Ceratosauria. The Abelisauria include, according to these researchers Ilokelesia and Abelisauroidea including Noasauridae and Abelisauridae. The taxon Abelisauria rarely found but use and is rejected by most researchers.
Recent studies classify Ilokelesia contrast, as a representative of the Abelisauroidea, the exact relationships are controversial. Carrano and colleagues ( 2002) and Tykoski and Rowe (2004) see this genus as basal representatives of Abelisauroidea outside the Abelisauridae. Carrano and Sampson (2008) see this as a derived class, however, representatives of the Abelisauridae and as a sister genus of Carnotaurus; the basal position in previous analyzes is due, according to these researchers to the very fragmentary nature of the only known find. Canale and colleagues ( 2008) also consider Ilokelesia as derived Abelisauriden; in this study makes this genus together with Skorpiovenator, Ekrixinatosaurus, Carnotaurus and Aucasaurus the new group Brachyrostra.
Discovery
The only Fund ( holotype, specimen number PVPH -35) was discovered in the Argentine province of Neuquen south of Plaza Huincul 1991. It was the first discovery of a theropod from the Huincul lineup. The fragmentary remains close a few skull bones ( postorbital and square leg ), parts of the cervical, dorsal, and caudal vertebrae, cervical ribs, Hämalbögen, foot bones and two claws with a. How Carrano and Sampson (2008) noted, these include bone, however, at least two different individuals, as three postorbital were discovered. Along with these fossils a vortex series was salvaged, which belonged to a third copy: Although it also constituted a Abelisauroidea in this individual, it can not currently be attributed with certainty Ilokelesia.
Documents
Used literature
- JI Canale, CA Scanferla, FL Agnolin and FE Novas: New carnivorous dinosaur from the Late Cretaceous of NW Patagonia and the evolution of abelisaurid theropods. In: Natural Sciences. Vol 96, No. 3, 2008, pp. 409-414, doi: 10.1007/s00114-008-0487-4.
- Matthew T. Carrano, Scott D. Sampson: The Phylogeny of Ceratosauria ( Dinosauria: Theropoda ). In: Journal of Systematic Palaeontology. 6, 2008, pp. 183-236, doi: 10.1017/S1477201907002246.
- Rodolfo A. Coria: Nonavian theropods. In: Zulma Gasparini, Leonardo Salgado, Rodolfo A. Coria (ed.): Patagonian Mesozoic reptiles. Indiana University Press, Bloomington 2007, ISBN 0,253,348,579th
- Rodolfo A. Coria, Leonardo Salgado: A Basal Abelisauria Novas, 1992 ( Theropoda - Ceratosauria ) from the Cretaceous of Patagonia, Argentina. In: Gaia N ° 15, Lisbon, December 1998, pp. 89-102.
- R. S. Tykoski, T. Rowe: Ceratosauria. In: DB Weishampel, P. Dodson, H. Osmólska (eds.): The Dinosauria. 2nd edition. University of California Press, Berkeley, 2004, ISBN 0-520-24209-2, pp. 47-70.