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sharp-clawed runner
Calamosaurus
Say it like this: “kal-uh-mo-SOR-us”
Calamosaurus foxi
Calamosaurus ate meat and walked on two legs. It lived in the Early Cretaceous. Bones have been found in the United Kingdom.
- When
- Early Cretaceous (Barremian) · roughly 125.8 to 121.4 million years ago
- Named in
- 1891 · Lydekker, R.
- Hip height
- Not established
- Length
- 3.5 m · 11 ft
- Weight
- Not established
- Found in
- the United Kingdom · Wessex
- Food and walking
- Carnivore · Two legs
- Kind
- sharp-clawed runner · Theropod
- Family branch
- Tyrannosauroidea
The story in short
Calamosaurus was formally named in 1891 by R. Lydekker. The name means “reed lizard.”
Fossils referred to Calamosaurus date to the Early Cretaceous (Barremian), roughly 125.8 to 121.4 million years ago. Finds come from the United Kingdom, including the Wessex Formation. It was a carnivore and walked on two legs.
Published estimates put Calamosaurus at a length near 3.5 m.
On the family tree it sits in Tyrannosauroidea, among the theropod dinosaurs.
Close relatives
Alectrosaurus
Alectrosaurus olseni
Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago
Aviatyrannis
Aviatyrannis jurassica
Late Jurassic (Oxfordian · Kimmeridgian · Tithonian) · roughly 161.5 to 143.1 million years ago
Chingkankousaurus
Chingkankousaurus fragilis
Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago