Dinosaurs · Large ornithopod

Telmatosaurus

Say it tel-ma-toh-sore-us. The name means ‘swamp lizard’.

Telmatosaurus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of large ornithopods

Length: 5 m
Diet: Plant-eater
When: Late Cretaceous84 to 66 million years ago
Fossils found in: France, Romania, Spain
Named by: Nopcsa (1900)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Hadrosauridae

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

Large ornithopods. Big plant-eaters that walked on two or four legs, including the duck-billed dinosaurs. See all 36

Lived at the same time

Pyroraptor · same country
Struthiosaurus · same country
Rhabdodon · same country
Ampelosaurus · same country
Magyarosaurus · same country
Zalmoxes · same country
Anserimimus
Borogovia

Other large ornithopods

Bactrosaurus Late Cretaceous
Lophorhothon Late Cretaceous
Tsintaosaurus Late Cretaceous
Gryposaurus Late Cretaceous
Maiasaura Late Cretaceous
Brachylophosaurus Late Cretaceous
Nipponosaurus Late Cretaceous
Tanius Late Cretaceous

Source: Telmatosaurus 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.