Massive dinosaur skeleton found by palaeontologists in Argentina could reportedly be the largest terrestrial animal with a body mass that can be accurately determined, reports the Washington Post. The new massive dinosaur skeleton found had a long neck and tail almost as long as a city bus. It stood two stories high at the shoulder and weighed at some 65 tons, a weight described by USA Today as heavier than a fully loaded semi-truck.

The new massive dinosaur skeleton found has been named "Dreadnoughtus schrani", and it is reportedly one of the most massive land animals of all time. Not only does Dreadnoughtus have a ridiculously weight, but its remains are the first super-large dinosaur to be found with so many pieces.

According to the Washington Post, the measurements of the bones of the massive dinosaur skeleton found, from its hind leg and foreleg, revealed that it weighed 65 tons. However, it still wasn't finished growing when it died in the Patagonian hills of Argentina about 77 million years ago.

Study author and paleontologist Kenneth Lacovara at Drexel University said, "To put this in perspective, an African elephant is about five tons, T. rex is eight tons, Diplodocus is 18 tons, and a Boeing 737 is around 50 tons."

 "And then you have Dreadnoughtus at 65 tons," said Lacovara.

According to CBS News, before discovery of Dreadnoughtus, other discoveries of "super-massive" dinosaurs before were known only from fragmentary fossils. This means the new massive dinosaur skeleton found will be able to provide researchers with a unique opportunity to learn about the anatomy and evolutionary history of one of the largest animals that ever lived.

The new massive dinosaur skeleton found of the Dreadnoughtus is reportedly so complete and beautifully preserved that the insights it could provide is unprecedented.

The Dreadnoughtus is "a really important discovery," says paleontologist Michael D'Emic of Stony Brook University, who is not associated with the new massive dinosaur skeleton found.

D'Emic said, "The glimpses we have of those giant, giant dinosaurs are pretty fleeting. ... (Dreadnoughtus) will serve as a key to understanding all those other, more fragmentary specimens."

The massive dinosaur skeleton found was discovered in Argentina in 2005 and because of the completeness of its bones, it allowed scientists to determine its weight with unusual precision, reports USA Today.

To put into perspective the colossal weight of the Dreadnoughtus, it is compared to many models of the Boeing 737. At 65 tons, it is even heavier than the passenger jets.

Lacovara said it's the largest dinosaur whose weight can be accurately calculated.

Lacovara reportedly named the beast after the impervious early 20th century battleships.

With "Dreadnoughtus schrani", Dreadnoughtus means "fears nothing", while "schrani" was hailed in honor of American entrepreneur Adam Schran, who provided support for the research, according to CBS News.

Despite the immense size and weight of the massive dinosaur skeleton found, Lacovara said there may still be a "good chance" that a dinosaur named "Argentinosaurus" is heavier than Dreadnoughtus.

Roger Benson, a paleontologist of the University of Oxford unaffiliated with the new discovery, puts Dreadnoughtus behind Argentinosaurus, which reportedly weighed as much as 90 tons.

Despite Benson's claim, clearly Dreadnoughtus is still unimaginably large and imposing, as described by USA Today.

According to CBS News, the plant-eating dinosaur had a characteristic peg-like teeth, plank-like ribs and huge legs. It reportedly belonged to a group called "titanosaurs", which were common in southern continents around 66 to 100 million years ago.

The massive dinosaur skeleton found was a plant eater, but despite this, it was equipped for battle with its muscular tail which could be used as a weapon. It also had large claws on its back feet formidable to natural enemies.

Its size alone would have made it the king of the forests in its home in the late Cretaceous.

Lacovara says, "If this thing just leaned on a T. rex, it would probably kill it. Walking up to it "would be like approaching a living building. ... It would be a pretty overwhelming moment, and not advisable."

However, being that large isn't all it's cracked up to be.

Based on the width and strength of the massive dinosaur skeleton found, toppling over would have meant instantaneous death.

"If you look at its really big ribs, there's no way they're going to withstand 65 tons of weight on top of them. It would have been a catastrophic event in the life of a Dreadnoughtus if it fell over," said Lacovara.

Still, with its 37-foot-long neck, it wouldn't have done much walking. The neck could reportedly provide easy access to a wide bounty of vegetation.

In the end however, the Dreadnoughtus was still susceptible to death by natural causes. According to USA Today, power from a river in full flood was what killed the giant creature.

A strong torrent reportedly swept away two Dreadnoughtuses some 80 million years ago. They could have been dead before the waters dumped them on a bed of quicksand-like sediment.

Luckily though, the mud swallowed the animals whole and scientists had the massive dinosaur skeleton found whole. Locavara and his team were able to recover around 70% of the types of bones Dreadnoughtus had below its head.

According to multiple reports, the study on Dreadnoughtus was published online Thursday in the journal "Scientific Reports."

CBS News reports the researchers have excavated the fossil in southern Patagonia, Argentina, over four field seasons between 2005 and 2009. A smaller specimen with less-complete remains was also discovered at the site.

Scientists believe there to be more massive dinosaurs out there, but because of lack of bones, their masses can't be accurately calculated.

Currently, researchers have around 10 Dreadnoughtus papers in the pipeline, four of which are already written. This reportedly takes the analysis a step further.

One study looks at the dinosaur's movements through the use of robotic and computer simulations, with 3D scans of the bones which are already publicly available for free download along with the current study.

Lacovara said, "Kids are going to be able to download the Dreadnoughtus bones and play with them."

"This is the kind of creature that will soon make it into Hollywood," he said. "You can guarantee that the next documentary on dinosaurs will feature this new creature," he added.

Massive dinosaur skeleton found recently will serve as a Rosetta Stone to unlocking the mysteries of other enormous dinosaurs, said D'Emic, a palaeontologist.

To see how surprisingly huge this dinosaur find is, watch the video below.