Argentinosaurus

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, found in Neuquén Province. It may be the largest dinosaur,Mortimer, Mickey ( Chi glucógeno fisyzt2001-09-12). "Titanosaurs too large?". Dinosaur Mailing List.   but its remains are so incomplete that palaeontologists prefer to use Saltasaurus for their calculations. An accurate estimate was got for the much more complete sub-adult Dreadnoughtus.

 Rough estimates 
The following shows the disagreement on estimates of size:
Thomas Holtz: 120 feet (36.6 meters)?Holtz, Thomas R. Jr. 2012. Dinosaurs: the most complete, up-to-date encyclopedia for dinosaur lovers of all ages .
Mickey Mortimer: 22 - 26 meters.

 References 

category:Titanosaurs
Category:Cretaceous dinosaurs
Category:Neuquén Province