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Patagotitan was an enormous titanosaur from the Cretaceous of Argentina. It vies with Argentinosaurus and an isolated shin-bone that has been referred to Alamosaurus for the title of largest land animal, but the two specimens of Patagotitan provide a much clearer view of the animal’s skeleton than in Argentinosaurus (and obviously more than a single shin bone!).
Patagotitan has had several claims made about its length and mass. It doesn’t appear heavier than Argentinosaurus, although I haven’t yet done a GDI mass estimate for it. While it has been reported to be as long as 40 m (131 feet), and the mount at the Field Museum is reported to be 37 m (122 feet) long, those estimates seem to be significantly inflated by the addition of extra vertebrae in the middle of the tail. In this reconstruction I get a length of ~28 m (92 feet), which is still a very long animal, but falls short of prior estimates.
The evidence
