Patagotitan mayorum

Patagotitan is a titanosaurian sauropod dinosaur genus found in the Chubut Province of Patagonia, Argentina. Patagotitan mayorum, originally revealed in 2014 and legally named in 2017 by José Carballido, Diego Pol, and colleagues, is the only species known from several individuals. Contemporary research estimated the type specimen, a young adult, to be 37 m (121 ft) long with a weight of 69 tonnes (76 short tons), subsequently corrected to 55-57 tonnes (61–63 short tons).

Patagotitan, like other titanosaur sauropods, was a quadrupedal herbivore with a long neck and tail that was renowned for its size. News sources in 2014 claimed size estimations of 40 m (131 ft) long and 77 tonnes (85 short tons); science journalist Riley Black cautioned in 2014 that it was still too early to establish size estimates with the desired scientific precision. Patagotitan mayorum's species description was published in 2017, with an estimated length of 37 m (121 ft) and an approximate weight of 69 tonnes (76 short tons) when using a scaling equation, and 44.2-77.6 tonnes (43.5-76.4 long tons; 48.7-85.5 short tons) when using a volumetric method based on 3D skeletal models.