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T. rex skull ZoomDinosaurs.com
Dinosaur
News
Biggest Meat-eaters Found in Argentina
New Theropods Bigger than T. rex or Giganotosaurus
April 29, 1999

Giganotosaurus Argentinian paleontologist Rodolfo Coria has excavated two enormous meat-eating dinosaurs from the Patagonian desert of southwestern Argentina. These newly discovered fossils were theropod dinosaurs even larger than Giganotosaurus (which was larger than T. rex). These fossils date from about 90 million years ago, from the Cretaceous period.

Like the other enormous meat-eating dinosaurs, these newly-discovered meat-eaters had a large head with many sharp teeth, short arms, hollow bones, and a long tail. Over 200 bones have been found, coming from five different animals. Unfortunately, none of the skeletons is complete, so assessing the exact lengths is difficult, but the largest bones are bigger than the corresponding bones in Giganotosaurus or T. rex.

The dig site is in Neuquen province, Argentinia. Coria, a paleontologist from the Carmen Funes Museum in Neuquen, Argentina, described the original Giganotosaurus in 1993.



Giganotosaurus

Giganotosaurus was a 47-foot long meat-eating dinosaur which weighed about 8 tons and stood 12 feet tall (at the hips). It walked on two legs, had a brain the size of a banana, and had enormous jaws with 8-inch long, knife-like, serrated teeth in a 6 feet (1.8 m) long skull. Giganotosaurus was a theropod from the mid-Cretaceous period, living about 100-95 million years ago, toward the end of the Mesozoic Era, the "Age of Reptiles".

Although some news sources (like Reuters) reported that Giganotosaurus kept T. rex from venturing into South America, this is wrong.

Giganotosaurus lived and died millions of years before T. rex evolved. Also, a sea separated North and South America during the Cretaceous. These two titans could never have met, unless they had a time machine and a boat.

Giganotosaurus was a carnivorous dinosaur that was even larger than T. rex. Because of its very small brain case, it had been thought that Giganotosaurus was a relatively dumb dinosaur, exhibiting few complex behaviors. Giga-noto-saurus means "giant southern reptile". Giganotosaurus was originally found by a local auto mechanic whose hobby is hunting dinosaur bones. In honor of the discoverer, Ruben Carolini, the huge dinosaur has been named Giganotosaurus carolinii. Its fossil was unearthed in the Patagonia region of southeastern Argentina (near the town of El Chocon) in 1993. 70 percent of the skeleton has been found. Near the Giganotosaurus, fossils were found of a 75-foot-long sauropods (plant eaters), Argentinosaurus, presumably a victim of Giganotosaurus.

A Comparison of Giganotosaurus and T. rex
GIGANOTOSAURUS caroliniiTYRANNOSAURUS rex
Skull length6 feet (1.8 m)5 feet (1.5 m)
Hands3 fingerslarger, with 2 fingers
Height at hips12 feet (3.7 m)10 feet (3 m)
Length45-47 feet (14.5 m)40 feet (12 m)
Weightabout 8 tonsabout 5 tons
Teethlong, knife-like, serrated - slicing actionconical, serrated - crushing action
Brain size, shapesmall, banana shapedlarger and wider
When they livedabout 100-95 million years agoabout 68- 65 million years ago
Where they livedSouth AmericaNorth America
PictureGiganotosaurus

Giganotosaurus was probably bigger than Tyrannosaurus rex, who was about 40 feet long, about 5 tons in weight and about 10 feet tall at the hips. Giganotosaurus, however, was more lightly built and had a much smaller brain case. Giganotosaurus lived about 30 million years before Tyrannosaurus rex, which was among the last of the dinosaur species alive before the Cretaceous-Tertiary extinction 65 million years ago.

Giganotosaurus was a theropod dinosaur. The theropods were a suborder of the Order Saurischia, the lizard-hipped dinosaurs.

GIGANOTOSAURUS ACTIVITIES

RELATED LINKS
A pack of Giganotosaurus found in Patagonia

Information sheet on Giganotosaurus

Information sheet on T. rex

Information about packs of dinosaurs

Other extreme dinosaurs - biggest, smallest, fastest, smartest, etc.

Other fossils found in South America.

A Geologic Time Chart.




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