Scientists found the new species' bones among three different layers of sediment, suggesting the dinosaurs frequented the floodplain where they became buried and preserved. Both names honor a family farm that hosts researchers.
The 122-foot skeletal cast, a Titanosaur, was given the name Patagotitan mayorum by paleontologists during a ceremony at the museum Wednesday.
Recently, in the region of Patagonia, Argentina, were found fossils that supposedly belong to the largest known dinosaur species at this point.
While it's unclear just how tall it would have been with a fully extended neck, the main body of the dinosaur would have been over 20 feet high. It's so big that the dinosaur's head sticks out into a hallway at the NY museum.
Analysis showed that Patagotitan had a probable body mass of 69 tons (62 metric tonnes).
If you'd like to compare Patagotitan to the famous carnivores that have made residence in the popular imagination, forget about it: Tyrannosaurus rex, for instance, "look like dwarfs when you put them against one of these giant titanosaurs", Pol told Time magazine. You could stack 12 African elephants on top of the other and mayorum would still likely outweigh them.
Although some estimates have given another Patagonian titanosaur, Argentinosaurus, the title of biggest land animal ever, with a body mass of more than 80 tonnes, these have not been based on limb measurements and may be unreliable.
Pol said "the million-dollar question" was finding out "what happened 100 million years ago in Patagonia" that allowed these animals to be "contenders for the heavy weight championships of dinosaurs".
"In one of the levels there is a femur that, clearly, had been stepped on by another animal", said researcher Jose Luis.
This theory also raises another very exciting prospect: there may be dinosaurs out there that out-grew even Patagotitan mayorum's monumental scale.
The researchers explain why the titanosaurs reached such great dimension by assuming it lived during an explosion of flowering plants that allowed the species to thrive. Researchers believe it is the largest dinosaur species ever discovered.