What dinosaur lived with a stegosaurus?

Stegosaurus lived in what is now the USA between 155 and 150 million years ago, as well as Portugal.

In America, Stegosaurus would have lived alongside the carnivores Allosaurus, Epanterias, Saurophaganax, Ceratosaurus, Elaphrosaurus, Torvosaurus, and Ornitholestes, the sauropods Diplodocus, Apatosaurus, Camarasaurus, Barosaurus, Eobrontosaurus, and BrachiOSaurus, the ornithopods Dryosaurus, Camptosaurus, Drinker, Othnielia, Othnielosaurus, Uteodon, the stegosaur Hesperosaurus, the ankylosaurs Mymooropelta and Gargoyleosaurus,

In Portugal, Stegosaurus probably lived alongside the carnivores Allosaurus, Ceratosaurus, and Lourinhanosaurus, the stegosaurids Miragaia and Dacentrurus, the ornithopod Draconyx, the ankylosaur Dracopelta, and the sauropods Lusotitan and Dinheirosaurus.