Megaraptor

From Wikipedia, the free encyclopedia

Megaraptor

Extinct (fossil)

Scientific classification

Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Saurischia
Suborder:	Theropoda
Infraorder:	Carnosauria
Superfamily:	Allosauroidea
Genus:	Megaraptor
Species:	M. namunhaiquii

Binomial name

Megaraptor namunhuaiquii
Novas, 1998

Megaraptor ("giant thief") was once thought to be the largest dromaeosaur ever found, but is now known to be a carnosaur related to Allosaurus. It lived in Late Cretaceous times in the Patagonian region of Argentina. It was a contemporary of Giganotosaurus, one of largest carnivorous dinosaurs of all time.

[edit] Identification

Megaraptor was initially described as a giant dromaeosaur (Novas, 1998). It was known primarily from a single claw, about 1ft long, that resembled the sickle-shaped foot claw of dromaeosaurids. The discovery of a complete front limb, however, showed that this giant claw actually came from the first finger of a carnosaur's hand (Calvo et al., 2004). The hand is still quite different from other carnosaurs, so it is not clear whether Megaraptor is an allosaurid, a carcharodontosaurid, a megalosauroid, or something else entirely.

It should be noted that, when first discovered and prior to publication, the spinosaurid Baryonyx was also reported to be a dromaeosaur, again based on a large hand claw. It can be viewed at Fernbank Science Center in Atlanta, GA.

[edit] References

Calvo, J. O., Porfiri, J.D., Veralli, C., Novas, F.E., and Poblete, F. (2004). Phylogenetic status of Megaraptor namunhuaiquii Novas based on a new specimen from Neuquén, Patagonia, Argentina. Ameghiniana 41:565-575.
Novas, F.E. (1998). Megaraptor namunhuaiquii, gen. et sp. nov., a large-clawed, Late Cretaceous theropod from Patagonia. Journal of Vertebrate Paleontology 18:4-9.