Dinosaurs · Prosauropod

Ammosaurus

Say it ah-moh-SORE-us. The name means ‘sand lizard’.

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

Length: 5 m
Diet: Plant-eater
When: Early Jurassic195 to 180 million years ago
Fossils found in: USA
Named by: Marsh (1891)
Family tree: Dinosauria › Saurischia › Sauropodomorpha › Anchisauria › Anchisauridae

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

Prosauropods. Early long-necked plant-eaters, relatives of the sauropods. See all 16

Lived at the same time

Podokesaurus · same country
Segisaurus · same country
Coelophysis · same country
Anchisaurus · same country
Dilophosaurus · same country
Kotasaurus
Emausaurus
Aardonyx

Other prosauropods

Yimenosaurus Early Jurassic
Aardonyx Early Jurassic
Anchisaurus Early Jurassic
Lufengosaurus Early Jurassic
Jingshanosaurus Early Jurassic
Yunnanosaurus Early Jurassic
Massospondylus Early Jurassic
Plateosaurus Late Triassic

Source: Ammosaurus 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.