Genus: Bajadasaurus GALLINA, APESTEGUIA, CANALE, & HALUZA, 2019
Etymology: Spanish, bajada, "downhill"; in reference to the locality Bajada Colorada, Neuquen Basin, Patagonia, Argentina and Greek, sauros, 'lizard."
Species: pronuspinax GALLINA, APESTEGUIA, CANALE, & HALUZA, 2019
Etymology: Latin, pronus, "bent over forward" and Greek, spinax, "spine"; referring to the anteriorly poinrted, curved, neural spines of the cervical vertebrae.
Holotype: MMCh-PV 75
Locality: Bajada Colorada locality 40 km south of Picun Leufu Town, National Route 237, Neuquen Basin, Patagonia, Argentina.
Horizon: Bajada Colorada Formation.
Age: Late Berriasian-Valanginian Stage, Lower Neocomian Supepoch, Lower Early Cretaceous Epoch,
Material: Left maxilla, left lacrimal, both prefrontals, both frontals, both parietals, both postorbitals, both squamosals, left quadratojugal, both pterygoids, both quadrates, supraoccipital, exoccipital-opisthotic complex, basioccipital, basisphenoid, both prootics, both laterosphenoids, both orbitosphenoids, both dentaries, left surangular, both angulars, both splenials, left prearticular, left articular, isolated upper tooth row, both proatlases, atlantal neurapophyses, axis adn ?fifth cervical vertebra..