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Three "well preserved" specimens of Lavocatisaurus agrioensis, hitherto unknown, were discovered by a team of paleontologists from the province of Neuquén.
Adults and two juvenile dinosaurs are thought to have traveled the planet about 110 million years ago.
They were herbivores and would have belonged to the group of dinosaurs known as Sauropods – including Diplodocus and Brontosaurus – among the largest beasts to roam the planet.
Titans are said to have extremely long necks and tails with a relatively small head.
"" Not only is it the discovery of a new species in an area where one does not expect to find fossils, but the skull is almost complete "
Researcher Jose Luis Carballido
The fossils showed the adult a length of about 12 meters, while scientists think that young lizards measured up to seven meters.
The team from Spain and Argentina found parts of the neck, tail and back, but was shocked to find that the adult's skull is "almost complete".
Researcher Jose Luis Carballido, of the Egidio Feruglio Museum, told AFP: "We found most of the cranial bones: the muzzle, the jaws, many teeth, as well as the bones that define the orbits, by example. we managed to create an almost complete reconstruction.
"Not only is the discovery of a new species in an area where one does not expect to find fossils, but the skull is almost done."
The new species is believed to have traveled in a group and died together.
Their discovery was a great surprise to paleontologists, convinced that the area where their remains were found was a desert where food and water supplies for herbivores were declining.
Dr. Cabadillido added: "Although we can imagine that this group of sauropods could have adapted to move in more arid environments, with little vegetation, little humidity and little water, this is a place where you would not seek no fossils. "
The heaviest Sauropod would be the Argentinosaurus, which would have weighed 80 tons.
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