Dinosaurs · Large ornithopod

Jaxartosaurus

Say it jak-sahr-toh-sore-us. The name means ‘Jaxartes [River] lizard’.

Jaxartosaurus 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: 9 m
Diet: Plant-eater
When: Late Cretaceous94 to 84 million years ago
Fossils found in: Kazakhstan
Named by: Riabinin (1939)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Hadrosauridae › Lambeosaurinae

Where Jaxartosaurus 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

Other large ornithopods

Aralosaurus Late Cretaceous
Brachylophosaurus Late Cretaceous
Eolambia Late Cretaceous
Nipponosaurus Late Cretaceous
Protohadros Late Cretaceous
Tanius Late Cretaceous
Gryposaurus Late Cretaceous
Bactrosaurus Late Cretaceous

Source: Jaxartosaurus 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.