(Toothed river thief).
Named By: Novas, Excurra & Leocuona - 2008.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Megaraptora.
Species: O. burkei (type).
Size: Uncertain due to incomplete fossil material.
Known locations: Argentina.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Partial skull, teeth, caudal (tail) vertebra and a partial tibia (one of the lower leg bones).
name Orkoraptor is derived from 'Orr-Korr' the
Aoniken name for the
La Leona River of Argentina.When first described, Orkoraptor
thought to be a coelurosaur thus a possible tyrannosauroid.
later studies have since caused this notion to be dismissed as
Orkoraptor seems to actually be a form of late
surviving allosaurid, possibly a megaraptoran.
It's possible that the geographic isolation of South America from the rest of the world during the Cretaceous may have protected the lineage that led to Orkoraptor from other newly appearing forms. This is also reflected in the fact that Orkoraptor is one of the southernmost carnivorous dinosaurs that have been discovered in South America. Unless future fossil finds prove otherwise, Orkoraptor may have been restricted to the south due to the abundance of carcharodontid and abelisaurid theropods further north.
- Orkoraptor burkei nov. gen. et sp., a large theropod from the Maasdtrichtian Pari Aike Formation, southern Patagonia, Argentina. - Cretaceous Research 29(3):468-480. - F. E. Novas, M. D. Ezcurra & A. Lecuona - 2008.