Barosaurus

Say it BAR-oh-sore-us. The name means ‘heavy lizard’.

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

Length: 24 m
Diet: Plant-eater
When: Late Jurassic155 to 145 million years ago
Fossils found in: Tanzania, USA
Named by: Marsh (1890)
Family tree: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Diplodocidae

Where Barosaurus 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

Camptosaurus · same country
Coelurus · same country
Dryosaurus · same country
Gargoyleosaurus · same country
Giraffatitan · same country
Haplocanthosaurus · same country
Hesperosaurus · same country
Marshosaurus · same country

Other sauropods

Mamenchisaurus Late Jurassic
Euhelopus Late Jurassic
Europasaurus Late Jurassic
Giraffatitan Late Jurassic
Haplocanthosaurus Late Jurassic
Janenschia Late Jurassic
Supersaurus Early Cretaceous
Apatosaurus Late Jurassic

Source: Barosaurus 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.