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 Ilokelesia aguadagradensis

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PostSubject: Ilokelesia aguadagradensis   Wed Oct 26, 2016 5:26 pm

Ilokelesia aguadagradensis



Temporal range: 99.6–93.5 Ma Late Cretaceous

Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Superfamily: Abelisauroidea
Family: Abelisauridae
Genus: Ilokelesia
Species: Ilokelesia aguadagradensis

Ilokelesia is a primitive abelisaur found in 1991, preserved in the layers of the earliest Late Cretaceous of the Río Limay Formation, Neuquén Group, located near Plaza Huincul, Neuquén Province, Argentina. The specimen, consisting of very fragmentary elements of the skull, the axial and the appendicular skeletons, was described by Coria et al. in late 1998.

The generic name’s etymology is derived from the Mapuche language, ilo meaning “flesh” and kelesio, “lizard”; while the specific descriptor reflects the name of the locality where the fossil was found, Aguada Grande.

Ilokelesia, a medium sized theropod, is characterized by features of the skull, namely of its 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.

I. aguadagrandensis was 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; it retained, however, primitive features for Abelisauria as are an opening in the quadrate bone and a T-shaped postorbital.
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