Genus: Amargasaurus SALGADO & BONAPARTE, 1991
Etymology: In reference to La Amarga Canyon, a Province in Neuquen, Argentina, and Greek, sauros, “lizard”: “La Amaraga Canyon lizard”.
= Amargasaruus BONAPARTE, 1984 (nomen nudum)
= Amargasaurus BONAPARTE, 1990 (nomen nudum)
= Amargosaurus McINTOSH, 1989 (sic)

Species: cazaui SALGADO & BONAPARTE, 1991
Etymology: In honor of Dr. Luis B. Cazau, for his interest in the palaeontology of the La Amarga Formation.
= Amargasaurus groeberi BONAPARTE, 1984 (nomen nudum)
= Amargasaurus cazaui BONAPARTE, 1990 (nomen nudum)

Holotype: MACN-N 15

Locality: 70 km south of Zapala City, approximately 2.5 km southeast of the crossing between Arroyo La Amarga and National Road 40, Department Picun Leufu, Neuquen Province, Patagonia, Argentina.

Horizon: La Amarga Formation.

Biostratigraphy:

Age: Amargan Tetrapod Assemblage, Barremian Stage, Lower Gallic Subepoch, Lower Early Cretaceous Epoch-Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Cranium, vertebral column from atlas-axis to sacrum, ilium, humerus, radius and ulna, femur, tibia fibula and astragalus.

Amargasaurus cazaui (modified from SALGADO & BONAPARTE, 1991, Holotype: MACN-N 15.

Referred material:

SALAGADO & BONAPARTE, 2007

PV-6126-MOZ: A posterior cervical vertebra.