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long-neck giant
Amphicoelias
Say it like this: “AM-fi-SEEL-ee-as”
Amphicoelias altus
Amphicoelias ate plants and walked on four legs. It lived in the Late Jurassic. Bones have been found in the United States.
- When
- Late Jurassic (Kimmeridgian · Tithonian) · roughly 154.8 to 143.1 million years ago
- Named in
- 1877 · Cope, E. D.
- Hip height
- 4 m · 13 ft
- Length
- 18 m · 59 ft
- Weight
- 15 tonnes
- Found in
- the United States · Morrison
- Food and walking
- Herbivore · Four legs
- Kind
- long-neck giant · Sauropod
- Family branch
- Diplodocoidea
The story in short
Amphicoelias was formally named in 1877 by E. D. Cope. The name means “on both sides.”
It lived in the Late Jurassic (Kimmeridgian · Tithonian), roughly 154.8 to 143.1 million years ago. Finds come from the United States, including the Morrison Formation. It was a herbivore and walked on four legs.
Published estimates put Amphicoelias at a length near 18 m, hips about 4 m high, and a body mass around 15 tonnes.
On the family tree it sits in Diplodocoidea, among the sauropod dinosaurs.