 Dinosaurs that lived alongside Stegosaurus included theropods Allosaurus , Saurophaganax , Torvosaurus , Ceratosaurus , Marshosaurus , Stokesosaurus , Ornitholestes , Coelurus and Tanycolagreus . Sauropods dominated the region , and included Brachiosaurus , Apatosaurus , Diplodocus , Camarasaurus , and Barosaurus . Other ornithischians included Camptosaurus , Gargoyleosaurus , Dryosaurus , Othnielosaurus and Drinker . Stegosaurus is commonly found at the same sites as Allosaurus , Apatosaurus , Camarasaurus , and Diplodocus . 
