Barosaurus was a large Diplodocidae that lived in the Upper Jurassic Period. It could grow more than 26 meters (85 feet) in length and weigh up to 22 tons. It was closely related to Diplodocus.
Other names Barosaurus had was Gigantosaurus (not to be confused with the super predator Giganotosaurus).
||Wikipedia has a more detailed and comprehensive article on Barosaurus
Though no living animals of this species make an appearance in the film, Barosaurus is mentioned on a sign depicting the map of Gyrosphere Valley.
Barosaurus is number 56 of the Herbivore Threes that can be created in the game.