The dinosaur was first discovered in 2012 in southern Argentina, since then researchers have been working to compile an accurate profile of the creature that belonged to a special group of dinosaurs called titanosaurs.
"There is one small part of this family that has an incredible size", said Diego Pol from the paleontological museum, Egidio Feruglio, in Argentina, who became one of the authors of a study published on Tuesday August 8, 2017, in the journal Proceedings of the Royal Society B. Both names honor a family farm that hosts researchers. But what truly sets these plant-eating dinos apart is their monumental size - the team estimates that P. mayorum averaged about 37 meters (122 feet) in length and grew to 6 meters (20 feet) in height at the shoulder.
A cast of the dinosaur's skeleton is on display at the American Museum of National History in NY. The structure was so large that the dinosaur head almost goes into the hallway of the NY museum.
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. Another titanosaur called Argentinosaurus was previously thought to be the largest.
Scientists have known titanosaurs for a while, but this is a new species and even a new genus, which is a larger grouping, Pol said.
"I don't think they were scary at all", he said. "They may be slow moving animals, wake up, walk around, try to run, this is really challenging for the big animals", he said.
The species has competition for the crown of largest ever land animal. Along with a forest, it was like an all-you-can-eat buffet for these dinosaurs and they just got bigger.