Look up · dinosaur 141 of 1,425
long-neck giant · Doubtful name
Atlantosaurus
Atlantosaurus montanus
Atlantosaurus ate plants and moved in a way the fossils do not settle. It lived in the Late Jurassic. Bones have been found in the United States.
- When
- Late Jurassic
- Named in
- 1877 · Marsh, O. C.
- Hip height
- Not established
- Length
- Not established
- Weight
- Not established
- Found in
- the United States · Morrison
- Food and walking
- Herbivore · Not recorded
- Kind
- long-neck giant · Sauropod
- Family branch
- Sauropoda
The story in short
The genus Atlantosaurus dates to 1877, the year O. C. Marsh described it.
Fossils referred to Atlantosaurus date to the Late Jurassic, within an age that is only broadly constrained. Finds come from the United States, including the Morrison Formation. It was a herbivore. A habitual gait is not settled.
The fossils of Atlantosaurus are too incomplete for a responsible length, hip height, or weight, so those fields are left blank on purpose.
On the family tree it sits in Sauropoda, among the sauropod dinosaurs.
Close relatives
Aepisaurus
Aepisaurus elephantinus
Early Cretaceous (Albian) · roughly 113.2 to 100.5 million years ago
Amygdalodon
Amygdalodon patagonicus
Early Jurassic (Pliensbachian · Toarcian) · roughly 192.9 to 174.7 million years ago
Archaeodontosaurus
Archaeodontosaurus descouensi
Middle Jurassic (Bathonian) · roughly 168.2 to 165.3 million years ago