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Ilokelesia

Ilokelesia Temporal range: Cenomanian; ~95 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Family:	†Abelisauridae
Genus:	†Ilokelesia; Coria & Salgado, 1998
Species:	†I. aguadagrandensis
Binomial name
	†Ilokelesia aguadagrandensis Coria & Salgado, 1998

Genus of abelisaurid dinosaurs

Ilokelesia is an extinct genus of abelisaurid theropod dinosaurs, preserved in the layers of the earliest Late Cretaceous of the Huincul Formation (Neuquén Group) in Neuquén Province, Argentina.^[1] The only known specimen, consisting of fragmentary elements of the skull and skeleton, was described by Rodolfo Coria and Leonardo Salgado in late 1998.

Quick facts Scientific classification, Binomial name …

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Discovery and naming

Ilokelesia is only known from very fragmentary elements of the skull and the axial and appendicular skeleton, discovered in 1991.^[2] It was discovered ten meters away from where the holotype of Huinculsaurus was discovered. The genus was named and described in 1998.^[3]

The generic name is derived from the Mapuche language, ilo meaning “flesh” and kelesio, “lizard”; while the specific name reflects the name of the locality where the fossil was found, Aguada Grande.^[3]

Description

Ilokelesia was a medium-sized theropod. In 2010 Gregory S. Paul gave 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 lacking pleurocoels.^[3]

Ilokelesia was 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, with Abelisauridae and Noasauridae; but it was considered to retain primitive features for Abelisauria, 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]

References

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[1]

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
[2]

Coria, 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.
[3]

.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:”””””””‘””‘”}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url(“//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url(“//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url(“//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg”)right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url(“//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg”)right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(–color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(–color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}Coria, Rodolfo A.; Salgado, Leonardo (December 1998). “A Basal Abelisauria Novas, 1992 (Theropoda-Ceratosauria) from the Cretaceous of Patagonia, Argentina” (PDF). Gaia. 15: 89–102.
[4]

Paul, Gregory S. (2010). The Princeton Field Guide to Dinosaurs. New Jersey: Princeton University Press. p. 78.
[5]

Grillo, O. N.; Delcourt, R. (2016). “Allometry and body length of abelisauroid theropods: Pycnonemosaurus nevesi is the new king”. Cretaceous Research. 69: 71–89. Bibcode:2017CrRes..69…71G. doi:10.1016/j.cretres.2016.09.001.
[6]

Molina-Pérez & Larramendi (2016). Récords y curiosidades de los dinosaurios Terópodos y otros dinosauromorfos. Barcelona, Spain: Larousse. p. 257. ISBN 9780565094973.
[7]

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. PMID 19057888. S2CID 23619863.