Ultrasaurus is a species of sauropod dinosaur that lived during the Early Cretaceous period, around 105 million years ago, discovered by Haang Mook Kim. Known only from parts of back vertebrae and part of an upper forearm, the species is considered to be false, since there is not enough fossil evidence to classify it into an existing sauropod family.
During their tour of the Jurassic Park facility in 1990, Ed Regis tells Lex Murphy that Brontosaurus is the largest dinosaur, although Tim Murphy states that Brachiosaurus was the largest dinosaur, and that some people thought that Ultrasaurus and Seismosaurus were even larger than Brachiosaurus.
