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Neuquenraptor argentinus [jG] PDF Print E-mail
Dinosaurs - Dinosaurs N

Describer

Novas & Pol, 2005

Time

Cretaceous Late Cenomanian Turonian

Classification

Saurischia Theropoda Tetanurae Coelurosauria Maniraptora Unenlagiinae

Diet 

Carnivore

Fossilsite

Rio Neuquen Formation, Sierra del Portezuelo, Plaza Huincul, Argentina

Fall Under

Unenlagia comahuensis

Length

2.5 meter

Info

Genus 

Unenlagia comahuensis (Novas, 1997) > Unenlagia paynemili (Calvo, Porfiri & Kellner, 2004) >> Neuquenraptor argentinus (Novas & Pol, 2005) >> Araucanoraptor argentinus (Novas, 1997)

Material consists of fragments of cervical vertebra, dorsal ribs, haemal arches, left proximal radius, right femur and distal tibia, proximal tarsals, and most of the foot of the left hindlimb, found while digging up the ribcage of a titanosaur discovered near a site near Plaza Huincul, dated about 90 Ma. From this a head-to-tail length of 8 feet (2.5 m) and weight of 66 lbs (30 kg) are extrapolated.  This material is formerly namend as Nomen Nudum "Araucanoraptor".

Novas, F.E. & D. Pol, 2005. New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia. Nature 433: 858 - 861.

ABSTRACT: Most of what is known about the evolution of deinonychosaurs (that is, the group of theropods most closely related to birds) is based on discoveries from North America and Asia. Except for Unenlagia comahuensis and some fragmentary remains from northern Africa, no other evidence was available on deinonychosaurian diversity in Gondwana.

Here we report a new, Late Cretaceous member of the clade, Neuquenraptor argentinus gen. et sp. nov., representing uncontroversial evidence of a deinonychosaurian theropod in the Southern Hemisphere. The new discovery demonstrates that Cretaceous theropod faunas from the southern continents shared greater similarity with those of the northern landmasses than previously thought.

Available evidence suggests that deinonychosaurians were probably distributed worldwide at least by the beginning of the Cretaceous period. The phylogenetic position of the new deinonychosaur, as well as other Patagonian coelurosaurian theropods, is compatible with a vicariance model of diversification for some groups of Gondwanan and Laurasian dinosaurs.

 
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