Dinosaurs · Armoured dinosaur

Stegosaurus

Say it STEG-oh-SORE-us. The name means ‘roof lizard’.

Stegosaurus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of armoured dinosaurs

Length: 9 m
Diet: Plant-eater
When: Late Jurassic152 to 145 million years ago
Fossils found in: USA
Named by: Marsh (1877)
Family tree: Dinosauria › Ornithischia › Thyreophora › Stegosauria › Stegosauridae › Stegosaurinae

Where Stegosaurus sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Armoured dinosaurs. Plated and armoured plant-eaters, such as Stegosaurus and the ankylosaurs. See all 33

Lived at the same time

Allosaurus · same country
Apatosaurus · same country
Barosaurus · same country
Brachiosaurus · same country
Camptosaurus · same country
Ceratosaurus · same country
Coelurus · same country
Diplodocus · same country

Other armoured dinosaurs

Dacentrurus Late Jurassic
Gargoyleosaurus Late Jurassic
Hesperosaurus Late Jurassic
Hylaeosaurus Early Cretaceous
Kentrosaurus Late Jurassic
Tuojiangosaurus Late Jurassic
Chungkingosaurus Late Jurassic
Yingshanosaurus Late Jurassic

Source: Stegosaurus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.