Amargasaurus is a sauropod dinosaur of Cretaceous South America.


Amargasaurus reached only 10 meters in length, but its most distinguishing feature was a row of long spines running down its neck and back. It has been speculated that these spines may have supported a sail, but paleontologist Gregory S. Paul argued that this would decrease neck flexibility and instead suggested that they were covered with a horny sheath.[1]


Amargasaurus fossils were first discovered in Argentina. It was named in 1991 by Jose Bonaparte and his colleagues.[2]


Like all sauropods, Amargasaurus was a herbivore.


  1. Paul, Gregory S. (2000) The Scientific American Book of Dinosaurs, p 94. St. Martin's Press. ISBN 0-312-26226-4.
  2. Salgado L & Bonaparte JF. (1991). Un nuevo sauropodo Dicraeosauridae, Amargasaurus cazaui gen. et sp. nov., de la Provincia del Neuquén, Argentina. Ameghiniana 28: 333-346. [in Spanish]