Genus: Alcidedorbignya MUIZON & MARSHALL, 1987
Etymology: In honor of Alcide d’Orbigny (1802-1857), first professor of Paleontology at the National Museum of Natural History in Paris.

Species: inopinata MUIZON & MARSHALL, 1987
Etymology:

Holotype: YPFB PAL 6121

Locality: Vila Vila, Department of Cochabamba, Tiupampa, Bolivia.

Horizon: Mammal-bearing level of the El Molino Formation.

Biostratigraphy:

Age: Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Maxillary fragment with P4-M3

Referred material:

YPFB PAL 6122: M1.

YPFB PAL 6123: M1.

YPFB PAL 6127: P4.

YPFB PAL 6124: m2.

YPFB PAL 6125: m2.

YPFB PAL 6126: p4.

YPFB PAL 6128: Fragmentary mandible.