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Temporal range: Upper Cretaceous
Skeletal reconstruction at the Naturmuseum Senckenberg
Scientific classification
Kingdom: Animalia
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
(unranked): Titanosauria
Genus: Argentinosaurus
Bonaparte & Coria, 1993

Argentinosaurus was a titanosaurid sauropod dinosaur. It was an enormous, long-necked, long-tailed, quadrupedal, plant-eater from Argentina, South America during the Cretaceous period.

Argentinosaurus meaning "Argentina lizard", was named by paleontologists Coria & José Bonaparte in 1993. It is known from fossilized back vertebrae, tibia, ribs and sacrum. It may be the largest dinosaur, but its remains are so imcomplete that palaeontologists prefer to use Saltasaurus for their calculations.