Genus: Leinkupal GALLINA, APESTEGUIA, HALUZA, & CANALE, 2014
Etymology: Mapudungun, the language of the Mapuchee Native South American nation that inhabits northwestern Patagonia, Argentina, lein, "vanishing" and kupal, "family"; in reference to the record of the last known representative of the family Diplodocidae.

Species: laticauda GALLINA, APESTEGUIA, HALUZA, & CANALE, 2014
Etymology: Latin, lati (from latus), "wide," and Latin, cauda, "tail": in reference to the broad tail evidenced by the lateral extension of the transverse processes in proximal caudal vertebrae.

Holotype: MMCH-Pv 63-1

Locality: 40 km south of Picun Leufu town on the national route 237, southeastern Neuquen Province, Patagonia, Argentina.

Horizon: Bajada Colorado Formation.

Biostratigraphy:

Age: Berriasian-Valangian Stage, Lower Neocomian Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: Anterior caudal 7.

Paratypes:

MMCH-Pv 63-2/3: 2 anterior caudal vertebrae.

MMCH-Pv 63-4: Posterior cervical vertebra.

MMCH-Pv 63-5: Anterior dorsal vertebra.

MMCH-Pv 63-6: Anterior caudal vertebra.

MMCH-Pv 63-7/8: 2 mid-caudal vertebrae.

Referred material:

GARDERES, GALLINA, WHITLOCK & TOLEDO, 2022

Locality: Bajada Colorada locality 40 km south of Picun Leufu Town, National Route 237, Neuquen Basin, Patagonia, Argentina.

Horizon: Bajada Colorada Formation.

Biostratigraphy:

Age: Late Berriasian-Valanginian Stage, Lower Neocomian Supepoch, Lower Early Cretaceous Epoch,

Material:

MMCh-Pv 232: Endocast, inner ear and peripheral structuries.