Patagotitan mayorum, the long-necked behemoth lived about 102 million years ago and was likely more than 120 feet long and weighed 69 tons, or about the same as 12 African elephants (the current largest land dweller).
By those numbers, Patagotitan just edges out the previous “largest dinosaur ever,” another titanosaur called Dreadnoughtus.
Researchers describes a new giant titanosaur, which represents the largest species described so far and one of the most complete titanosaurs. Its inclusion in an extended phylogenetic analysis and the optimization of body mass reveals the presence of an endemic clade of giant titanosaurs inhabited Patagonia between the Albian and the Santonian. This clade includes most of the giant species of titanosaurs and represents the major increase in body mass in the history of Titanosauria.