Ilokelesiais an extinct genus ofabelisauridtheropod,[1]preserved in the layers of theearliestLate Cretaceous[2]of theHuincul Formation,Neuquén Group, located near Plaza Huincul,Neuquén Province,Argentina.The specimen, consisting of very fragmentary elements of the skull and the axial and appendicular skeleton, was described byRodolfo CoriaandLeonardo Salgadoin late 1998.[3]
| Ilokelesia Temporal range:Cenomanian
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| Life restoration | |
Scientific classification
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Abelisauridae |
| Genus: | †Ilokelesia Coria & Salgado, 1998 |
| Species: | †I. aguadagrandensis
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| Binomial name | |
| †Ilokelesia aguadagrandensis Coria & Salgado, 1998
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Discovery and naming
editIlokelesiais only known from very fragmentary elements of the skull and the axial and appendicular skeleton, discovered in 1991.[1]It was discovered ten meters away from where the holotype ofHuinculsauruswas discovered. The genus was named and described in 1998.[3]
Etymology
editThe generic name's etymology is derived from theMapuchelanguage,ilomeaning "flesh" andkelesio,"lizard"; while the specific descriptor reflects the name of the locality where the fossil was found, Aguada Grande.[3]
Description
editIlokelesia wasa medium-sizedtheropod.In 2010Gregory S. Paulgave a length of 4 meters (13 ft) and a weight of 200 kg (440 lbs).[4]In 2016 it was estimated to be 5.3 metres (17 ft) in length in a comprehensive analysis of abelisaur size.[5]The same year another estimation listed it higher at 5.8 meters (19 ft) and 840 kg (1,850 lbs).[6]It is characterized by features of the skull, namely of the quadrate and postorbital bones. The vertebral series also has distinctive characters setting it apart from other abelisaurs, such as reduced processes on the cervical vertebrae and dorsal vertebrae lackingpleurocoels.[3]
I. aguadagrandensiswas considered the most basal abelisaur described at the time, sharing characters, such as an expansion of the postorbital bone above the orbit and a flange of the same bone inside the orbit, withAbelisauridaeandNoasauridae;but it was considered to retain primitive features forAbelisauria,such as an opening in the quadrate bone and a T-shaped postorbital.[3]A subsequent analysis has placed it within Abelisauridae, as a brachyrostran carnotaurine.[7]
See also
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References
edit- ^abCoria, R.A.; Salgado, L. & Calvo, J.O. (1991) "Primeros restos de dinosaurios Theropoda del Miembro Huincul, Formación Río Limay (Cretácico Tardío Presenoniano), Neuquén, Argentina."Ameghiniana,28: 405-406.
- ^Coria, R.A.; Currie, P.J. & Carabajal, A.P. (2006). "A new abelisauroid theropod from northwestern Patagonia"Canadian Journal of Earth Sciences 43:1283—1289. doi:101139/E06-25
- ^abcdeCoria, Rodolfo A.; Salgado, Leonardo (December 1998)."A Basal Abelisauria Novas, 1992 (Theropoda-Ceratosauria) from the Cretaceous of Patagonia, Argentina"(PDF).Gaia.15:89–102.
- ^Paul, Gregory S. (2010).The Princeton Field Guide to Dinosaurs.New Jersey: Princeton University Press. p. 78.
- ^Grillo, O. N.; Delcourt, R. (2016). "Allometry and body length of abelisauroid theropods:Pycnonemosaurus nevesiis the new king ".Cretaceous Research.69:71–89.Bibcode:2017CrRes..69...71G.doi:10.1016/j.cretres.2016.09.001.
- ^Molina-Pérez & Larramendi (2016).Récords y curiosidades de los dinosaurios Terópodos y otros dinosauromorfos.Barcelona, Spain: Larousse. p. 257.ISBN9780565094973.
- ^Canale, J.I.; Scanferla, C.A.; Agnolin, F. & Novas, F.E. (2009)."New carnivorous dinosaur from the Late Cretaceous of NW Patagonia and the evolution of abelisaurid theropods"(PDF).Naturwissenschaften.96(3): 409–414.Bibcode:2009NW.....96..409C.doi:10.1007/s00114-008-0487-4.hdl:11336/52024.PMID19057888.S2CID23619863.