A big one!
But a bone analysis revealed that the six uncovered P. mayorum individuals weren't fully grown, suggesting that there are even larger dinosaurs out there waiting to be found. [Read the full story on Patagotitan mayorum, the largest dinosaur on record]
The previous record holder was another titanosaur from Patagonia called Argentinosaurus hiunculensis.
It's possible that the dinosaurs used an ancient lake as a watering hole. Perhaps the lake dried up during times of drought, and some of the titanosaurs died there, partly from thirst.
New York masterpiece
During the dig, Pol emailed Norell a photo of himself lying on the dinosaur's gigantic femur. Intrigued, Norell asked Pol if the AMNH could display the newfound species. Pol agreed, and a cast of the titanosaur was made and assembled at the AMNH in 2016, before the titanosaur was formally named.
[Read the full story about the museum's ongoing titanosaur exhibit]
The family tree shows that the clade of P. mayorum is a sister clade to Rinconsauria, a lineage that includes some of the smallest titanosaurs on record, the researchers wrote in the study. Some of these "small" titanosaurs, including Rinconsaurus and Saltasaurus, had body masses of about 6 tons (5.4 metric tons).
[Read the full story on Patagotitan mayorum, the largest dinosaur on record]