Genus: Unquillosaurus J. E. POWELL, 1979
Etymology: For Unquillo, in the Candaleria region of Salta Province, Argentina, and Greek, sauros, 'lizard'; Unquillo lizard.

Species: ceibalensis J. E. POWELL, 1979
Etymology: From the locality El Ceibal.
= Unquillosaurus ceibalii J. E. POWELL, 1979

Holotype: PVL 3670-11

Locality: Arroyo Morterito, El Ceibal, Candelaria, Salta Province, Argentina.

Horizon: Los Blanquitos Formation, Pirgua Subgroup, Salta Group.

Biostratigraphy:

Age: Campanian Stage, Late Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Nearly complete pubis.