Murusraptor barrosaensis was discovered in 2001 by the Argentinian-Canadian Dinosaur Project team, and was described in July 2016 in PLOS ONE, an open-access journal.
It was found in the Sierra Barrossa Formation, an outcropping about 30km from the town of Plaza Huincul, described as the "Drumheller of Argentina" by Philip. J. Currie.
Murusraptor is a megaraptor from the Late Cretaceous epoch. As the name implies, megaraptors are a large family of raptors (generally considered to be agile theropods with large toe claws).
The holotype of Murusraptor was 6.5 metres long, but it is believed to be an immature specimen judging by the visibility of sutures on the braincase, so adults were likely longer. It was a bipedal dinosaur with a long snout, a long tail for balance, and arms with three clawed fingers; the thumbs having a long claw. The skull has evidence of a severe infection, which may be related to what appear to be tooth marks from another therapod. Some extensive nasal sutures suggest that Murusraptor may have had a nasal crest.
The hip and rib bones of Murusraptor were found to be hollow, which was noted as being unusual for such a large therapod. It is believed that having these hollow bones allowed Murusraptor to be very agile for its size.
Murusraptor was a carnivore, as with all megaraptors, as evidenced by its teeth.
"Murusraptor" means "wall thief", referring to the fact that this raptor was found in a canyon wall. "Barrosaensis" alludes to Sierra Barrossa, the rock formation where it was discovered.