Slimosaurs are monstrous creatures that serve Bowser in the Nintendo Adventure Book Dinosaur Dilemma. They are described as looking like normal dinosaurs, except being twice as large and smelling terrible.
Several of them, including the Thesaurus, Tie-rack-asaurus Necks, and Times-Square-atops, attack Mario and Yoshi during the final battle at Bowser's summer home at the Valley of Bowser. When Mario ultimately defeats them, they explode, coating the Snowbell Prize Committee and the entire room in thick goo.