Amargasaurus

Say it A-MARG-oh-sore-us. The name means ‘Amarga lizard’.

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

Length: 12 m
Weight: 9 tonnes
Diet: Plant-eatertough plants
When: Early Cretaceous132 to 127 million years ago
Fossils found in: Argentina
Named by: Salgado and Bonaparte (1991)
Family tree: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Dicraeosauridae

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

Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59

Lived at the same time

Other sauropods

Aragosaurus Early Cretaceous
Jobaria Early Cretaceous
Pelorosaurus Early Cretaceous
Ligabuesaurus Early Cretaceous
Malawisaurus Early Cretaceous
Nigersaurus Early Cretaceous
Brachytrachelopan Mid Jurassic
Camarasaurus Late Jurassic

Source: Amargasaurus 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.