Species: santacrucensis NOVAS, CAMBIASO & AMBROSIO, 2004
Etymology: In reference to the southern Argentine province of Santa Cruz.
Holotype: MPM-10001
Locality: Los Hornos Hill, southern coast of Viedma Lake, lat. 49°51’16.2”S, Long. 72°06;26.3”W, Santa Cruz Province, Argentina.
Horizon: Pari Aike Formation.
Biostratigraphy:
Age: Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material: Skull and nearly complete skeleton.
Note: Has large oval ‘uncinate’ processes.
Note: Has gastroliths CEREDA, 2006