Dinosaurs · Armoured dinosaur

Hylaeosaurus

Say it HIGH-lee-oh-sore-us. The name means ‘woodland lizard’.

Hylaeosaurus 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: 5 m
Diet: Plant-eater
When: Early Cretaceous150 to 135 million years ago
Fossils found in: England
Named by: Mantell (1833)
Family tree: Dinosauria › Ornithischia › Thyreophora › Ankylosauria

Where Hylaeosaurus 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

Found in Britain. Fossils of Hylaeosaurus have been found in the United Kingdom. Read about how Britain moved across the globe in Britain's journey.

Lived at the same time

Becklespinax · same country
Valdosaurus · same country
Camptosaurus · same country
Iguanodon · same country
Dacentrurus · same country
Dicraeosaurus
Nqwebasaurus
Camarasaurus

Other armoured dinosaurs

Stegosaurus Late Jurassic
Dacentrurus Late Jurassic
Gargoyleosaurus Late Jurassic
Hesperosaurus Late Jurassic
Kentrosaurus Late Jurassic
Tuojiangosaurus Late Jurassic
Cedarpelta Early Cretaceous
Gastonia Early Cretaceous

Source: Hylaeosaurus 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.