Dinosaurs · Sauropod
Haplocanthosaurus
Say it hap-lo-kan-tho-sore-us. The name means ‘simple-spined lizard’.
- Length
- 21.5 m
- Diet
- Plant-eater
- When
- Late Jurassic154 to 142 million years ago
- Fossils found in
- USA
- Named by
- Hatcher (1903)
- Family tree
- Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Macronaria › Camarasauromorpha › Camarasauridae
Sauropods. Long-necked, four-legged plant-eaters, the biggest animals ever to walk on land. See all 59
Lived at the same time
- Dryosaurus · same country
- Gargoyleosaurus · same country
- Hesperosaurus · same country
- Marshosaurus · same country
- Othnielia · same country
- Saurophaganax · same country
- Supersaurus · same country
- Barosaurus · same country
Other sauropods
- Euhelopus Late Jurassic
- Europasaurus Late Jurassic
- Giraffatitan Late Jurassic
- Janenschia Late Jurassic
- Supersaurus Early Cretaceous
- Barosaurus Late Jurassic
- Mamenchisaurus Late Jurassic
- Apatosaurus Late Jurassic
Source: Haplocanthosaurus 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.