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Diamantinasaurus,( meaning "Diamtina River Lizard") is a genus of derived titanosaurian dinosaur from the Albian Stage of the Early Cretaceous age rocks of Australia. It is known from partial postcranial
799px-Diamantinasaurus
remains.Diamantinasaurus was quite a big stocky dinosaur: it had a huge bulky, barrel-shaped body up to 52 feet (16 metres) long, thick, stout front and back limb bones which were just about the same length, and a box-shaped skull ant the end of its long neck similar to that of Camarasaurus. Diamantinasaurus is based on a partial skeleton including a right shoulder blade, a sternal plate, much of the forelimbs, much of the hindlimbs except the feet, partial hips, and ribs. Diamantinasaurus was unusual for a derived titanosaurian in retaining a thumb claw. Many titanosaurids are known to have had small armour plates, however, it is not known whether Diamantinasaurus had them.

Diamantinasaurus was described in 2009 by Scott Hucknoll and colleagues. The type species is D. matildae, in reference to the folk song "Waltzing Matilda", which was written by Banjo Paterson in nearby Winton where another Sauropod had been found called Wintonotitan. A phylogenetic analysis found Diamantinasaurus to be a lithostrotian titanosaurian sauropod, in the same clade as sauropods such as Opisthocoelicaudia and Saltasaurus. The discovery has been nicknamed "Matilda" after "Waltzing Matilda" and is probably the biggest Sauropod dinosaur in Australia.

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