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Amargasaurus (A-mar-gah-sore-us), Amarga Lizard, lived in the Early Cretaceous of South America. Amargasaurus was a long-necked sauropod dinosaur belonging to a group called "dicraeosaurs". These medium-sized sauropods lived in Late Jurassic and Early Cretaceous of Africa and South America, where medium size ornithischians like stegosaurs and iguanodonts werre uncommon, so the dicraeosaurs filled their ecological role.

Content List

1. Genera & species

2. Characteristics

a. Size

b. Behavior

3. History of Discovery

4. Paleoenvironment

5. References

Genera and Species

Classification: Sauropoda, Dicraeosauridae.

Species: A. cazaui


Amargasaurus was a medium size sauropod with a short neck. It had a frill running along most of its neck and back, supported by an extremely long spine. There was a high sail over the hips. It has been speculated that the spikes could have formed a sail over the neck. The spines could have been used for defense and were almost certainly a display feature.


LENGTH: 9 m (30 ft). WEIGHT: 2 - 3 tons.


It was a low to medium browser and could have had the same social behavior as its diplodocid relatives.

History of Discovery

Discovered in 1991 by Salgado, L. and Bonaparte, J.F and known from a nearly complete skeleton including braincase but missing the tail.


Found in South America western Argentina in well watered forested plains with short dry seasons.


1.	Paul, G. (2010). The Princeton Field Guide to Dinosaurs (pp. 4440). Princeton, New Jersey: University Press Princeton.
2.	Worth, G. (1999). The Dinosaur Encyclopaedia dev13 (pp. 304). Scarborough, Western Australia: HyperWorks Reference Software.