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sharp-clawed runner
Acrocanthosaurus
Say it like this: “AK-roh-KAN-thuh-SOR-uhs”
Acrocanthosaurus atokensis
Acrocanthosaurus ate meat and walked on two legs. It lived in the Early Cretaceous. Bones have been found in the United States.
- When
- Early Cretaceous (Aptian · Albian) · roughly 121.4 to 100.5 million years ago
- Named in
- 1950 · Stovall, J. W.; Langston, W.
- Hip height
- 4 m · 13 ft
- Length
- 11–12.2 m · 36–40 ft
- Weight
- 7.5–8.4 tonnes
- Found in
- the United States · Antlers
- Food and walking
- Carnivore · Two legs
- Kind
- sharp-clawed runner · Theropod
- Family branch
- Carcharodontosauridae
The story in short
Acrocanthosaurus was formally named in 1950 by J. W. Stovall and W. Langston.
It lived in the Early Cretaceous (Aptian · Albian), roughly 121.4 to 100.5 million years ago. Finds come from the United States, including the Antlers Formation. It was a carnivore and walked on two legs.
Published estimates put Acrocanthosaurus at a length near 11–12.2 m, hips about 4 m high, and a body mass around 7.5–8.4 tonnes.
On the family tree it sits in Carcharodontosauridae, among the theropod dinosaurs.
Close relatives
Concavenator
Concavenator corcovatus
Early Cretaceous (Barremian) · roughly 125.8 to 121.4 million years ago
Eocarcharia
Eocarcharia dinops
Early Cretaceous (Aptian · Albian) · roughly 121.4 to 100.5 million years ago
Kelmayisaurus
Kelmayisaurus petrolicus
Early Cretaceous (Barremian · Aptian) · roughly 125.8 to 113.2 million years ago