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long-neck giant
Rhomaleopakhus
Say it like this: “ro-mah-LAY-oh-PAK-us”
Rhomaleopakhus turpanensis
Rhomaleopakhus ate plants and walked on four legs. It lived in the Late Jurassic. Bones have been found in China.
- When
- Late Jurassic (Kimmeridgian · Tithonian) · roughly 154.8 to 143.1 million years ago
- Named in
- 2021 · Upchurch, P.; Mannion, P. D.; Xu, X.; Barrett, P. M.
- Hip height
- 3.6 m · 12 ft
- Length
- 20 m · 66 ft
- Weight
- 18 tonnes
- Found in
- China · Kalazha
- Food and walking
- Herbivore · Four legs
- Kind
- long-neck giant · Sauropod
- Family branch
- Mamenchisauridae
The story in short
Rhomaleopakhus was formally named in 2021 by P. Upchurch and colleagues. The name means “strong forearm.”
It lived in the Late Jurassic (Kimmeridgian · Tithonian), roughly 154.8 to 143.1 million years ago. Finds come from China, including the Kalazha Formation. It was a herbivore and walked on four legs.
Published estimates put Rhomaleopakhus at a length near 20 m, hips about 3.6 m high, and a body mass around 18 tonnes.
On the family tree it sits in Mamenchisauridae, among the sauropod dinosaurs.
Close relatives
Analong
Analong chuanjieensis
Middle Jurassic (Bajocian) · roughly 170.9 to 168.2 million years ago
Anhuilong
Anhuilong diboensis
Middle Jurassic (Aalenian–Callovian) · roughly 174.7 to 161.5 million years ago
Chuanjiesaurus
Chuanjiesaurus anaensis
Middle Jurassic (Bajocian) · roughly 170.9 to 168.2 million years ago