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an omnivorous oviraptorid theropod dinosaur from the Late Cretaceous of China.
Pronunciation: ji-GAN-to-RAP-tor
Meaning: Gigantic plunderer
Author/s: Xu (2007)
Synonyms: None known
First Discovery: Nei Mongol, China
Chart Position: 493

Gigantoraptor erlianensis

By an extraordinary twist of fate, Gigantoraptor was unearthed while making a TV documentary in which a sauropod known as Sonidosaurus was supposed to be the star of the show. As Chinese paleontologist Xu Xing re-enacted the discovery and brushed the muck from a randomly-pulled bone he realised that it actually belonged to a hitherto unknown theropod, then he got all excited and lost focus, at which point filming stopped. Sonidosaurus just can't catch a break.

One of the strange things about Gigantoraptor, which can be garnered from the name, is its sheer size. With vital statistics of 8, 4, 2 (length, height and weight... in meters and tons!) it was almost as big as the contemporaneous sauropod Xu was researching, and is one of the largest Asian theropods to boot. But, stranger still, it belongs to a lineage of theropod dinosaurs that paleontologists believed got progressively smaller as they became more bird-like.

Gigantoraptor is far and away the largest member of Oviraptorosauria (a family anchored by Oviraptor; the "egg thief" that did no such thing) and boasts longer arms compared to body size than any of its clan. Despite its considerable size, its legs were proportionately long and skinny too (longer and skinnier than any theropod known from anywhere, in fact) and these features combined mean it was actually more bird-like than its smaller, feathered relatives.

Unfortunately, no feather impressions were preserved with the skeleton but creatures of such mass don't need them, not for insulation anyway, as they tend to maintain a constant and relatively high body temperature through a phenomenon known as "gigantothermy"—they absorb heat from their surroundings and give less back than smaller animals because of a lower surface area to body volume ratio.

That said, they may have had feathers on their tail and head for displays of machismo and mate-finding. They may have had feathers on their wings for incubatory purposes too, as gigantic theropod nests from the Late Cretaceous of China and Mongolia, complete with enormous eggs (assigned to the oospecies Macroelongatoolithus xixiaensis)—some up to 53cm in length—may have been made and laid by Gigantoraptor. Imagine boiling one of those for your breakfast.
Gigantoraptor is derived from the Latin gigant- (from the Greek gigas), "giant" and the Latin raptor, "plunderer" or "thief".
The species epithet, erlianensis, refers to the Erlian Basin.
The first fossils of Gigantoraptor were discovered in the Iren Dabasu Formation, Erlian basin, at Saihangaobi, Sonid Zuoqi, Inner Mongolia in 2005.
The holotype (LH V0011, housed at the Long Hao Geologic and Paleontological Research Center) is the partial skeleton of a subadult including the lower jaws, a neck vertebra, most of the back, tail and frontlimbs, and bits of hindlimb.
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 84-71 mya
Est. max. length: 8 meters
Est. max. hip height: 3.5 meters
Est. max. weight: 1.8 tons
Diet: Omnivore
• Xing Xu, Qingwei Tan, Jianmin Wang, Xijin Zhao, Lin Tan (14th June 2007) "A gigantic bird-like dinosaur from the Late Cretaceous of China". Nature Vol 447, 14 June 2007. doi:10.1038/nature05849
• G.S. Paul (2010) "The Princeton Field Guide to Dinosaurs".
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To cite this page:
Atkinson, L. "GIGANTORAPTOR :: from DinoChecker's dinosaur archive".
›. Web access: 23rd Mar 2017.