Saurischian dinosaurs of the Jurassic and Cretaceous include sauropods, the longest (at up to 40 meters ) and most massive terrestrial animals known (Argentinosaurus reached 80–100 metric tonnes, or 90–110 tons), as well as theropods, the largest terrestrial carnivores (Spinosaurus grew to 7–9 tonnes; the more famous Tyrannosaurus, to 6.8 tonnes).