- Length
- 22 m
- Diet
- Plant-eater
- When
- Late Jurassic155 to 145 million years ago
- Fossils found in
- China
- Named by
- Young (1954)
- Family tree
- Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Eusauropoda
Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59
Lived at the same time
- Chinshakiangosaurus · same country
- Chungkingosaurus · same country
- Sinraptor · same country
- Yangchuanosaurus · same country
- Yingshanosaurus · same country
- Euhelopus · same country
- Chaoyangsaurus · same country
- Anchiornis · same country
Other sauropods
- Barosaurus Late Jurassic
- Euhelopus Late Jurassic
- Europasaurus Late Jurassic
- Giraffatitan Late Jurassic
- Haplocanthosaurus Late Jurassic
- Janenschia Late Jurassic
- Supersaurus Early Cretaceous
- Apatosaurus Late Jurassic
Source: Mamenchisaurus 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.