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sharp-clawed runner
Duonychus
Say it like this: “ju-oh-NI-kuss”
Duonychus tsogtbaatari
Duonychus ate plants and walked on two legs. It lived in the Late Cretaceous. Bones have been found in Mongolia.
- When
- Late Cretaceous (Cenomanian–Santonian) · roughly 100.5 to 83.6 million years ago
- Named in
- 2025 · Kobayashi, Y.; Zelenitsky, D. K.; Fiorillo, A. R.; Chinzorig, T.
- Hip height
- Not established
- Length
- 3 m · 10 ft
- Weight
- 260 kg · 573 lb
- Found in
- Mongolia · Bayanshiree
- Food and walking
- Herbivore · Two legs
- Kind
- sharp-clawed runner · Theropod
- Family branch
- Therizinosauridae
The story in short
The genus Duonychus dates to 2025, the year Y. Kobayashi and colleagues described it.
Fossils referred to Duonychus date to the Late Cretaceous (Cenomanian–Santonian), roughly 100.5 to 83.6 million years ago. Finds come from Mongolia, including the Bayanshiree Formation. It was a herbivore and walked on two legs.
Published estimates put Duonychus at a length near 3 m and a body mass around 260 kg.
On the family tree it sits in Therizinosauridae, among the theropod dinosaurs.
Close relatives
Erlikosaurus
Erlikosaurus andrewsi
Late Cretaceous (Turonian · Coniacian · Santonian) · roughly 93.9 to 83.6 million years ago
Nanshiungosaurus
Nanshiungosaurus brevispinus
Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago
Nothronychus
Nothronychus mckinleyi
Late Cretaceous (Turonian) · roughly 93.9 to 89.8 million years ago