The first Patagotitan remains were uncovered in 2009 by Aurelio Hernandez. It was formally named and described in 2017.
Originally the only material known from Patagotitan was a lower thigh bone, but further expeditions uncovered more material. Ribs, tail bones, back bones, and neck bones have been found, as well as some of the shoulder, pelvic and thigh bones.
Through piecing together bones of many different specimens, scientists have a better picture of what Patagotitan looked like. Though it is more completely known than most titanosaurs, some important elements, such as its skull, are still undiscovered.
Patagotitan lived in the Late Cretaceous, in a forested environment that may also have contained floodplains.