Look up · dinosaur 41 of 1,425
long-neck giant
Alamosaurus
Say it like this: “AL-a-mo-SAWR-us”
Alamosaurus sanjuanensis
Alamosaurus ate plants and walked on four legs. It lived in the Late Cretaceous. Bones have been found in the United States.
- When
- Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago
- Named in
- 1922 · Gilmore, C. W.
- Hip height
- 4.5 m · 15 ft
- Length
- 21 m · 69 ft
- Weight
- 30–80 tonnes
- Found in
- the United States · Ojo Alamo
- Food and walking
- Herbivore · Four legs
- Kind
- long-neck giant · Sauropod
- Family branch
- Saltasauridae
The story in short
The genus Alamosaurus dates to 1922, the year C. W. Gilmore described it. The name means “ojo Alamo lizard.”
It lived in the Late Cretaceous (Maastrichtian), roughly 72.2 to 66 million years ago. Finds come from the United States, including the Ojo Alamo Formation. It was a herbivore and walked on four legs.
Published estimates put Alamosaurus at a length near 21 m, hips about 4.5 m high, and a body mass around 30–80 tonnes.
On the family tree it sits in Saltasauridae, among the sauropod dinosaurs.
Close relatives
Abditosaurus
Abditosaurus kuehnei
Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago
Igai
Igai semkhu
Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago
Qingxiusaurus
Qingxiusaurus youjiangensis
Late Cretaceous (Cenomanian–Maastrichtian) · roughly 100.5 to 66 million years ago