Species: cavernensis SIMPSON, 1933
Etymology:

Holotype: AMNH 3158

Locality: Barranca South of Lake Colhue-Huapi, Chubut, Patagonia, Argentina.

Horizon: Sarmiento Formation, Casamayor, Notostylops Beds.

Biostratigraphy:

Age: Middle-Late Eocene Epoch, Paleogene Period, Lower Tertiary Subera, Lower Cenozoic Era.

Material: Mid-section of skull, lower jaw missing the right anterior end.

_____________________________________________________________________________________

Species: palaeocenicus BONA, 2007
Etymology: In reference to the Paleocene.

Holotype: MPEF-PV 1933

Locality: El Gauchito, 45°14'S, 67°06'E., Chubut Province, Argentina.

Horizon: Salamanca Formation.

Biostratigraphy:

Age: Paleocene Epoch, Lower Paleogene Period, Lower Tertiary Subera, Cenozoic Era.

Material: Fragmentary lower jaw.

Referred material:

MPEF PV-1935: Fragmentary denary.

MLP 90-II-12-177, MPL 90-II012-124, MLP 93 XII-10-11: Teeth.

MLP 93 XII-10-13: Left anterior dentary.

MLP 950XII-10-27: Teeth.

MACN-PV CH 1914: Fragmentary mandible.

MACN-PV-CH 1915: Fragmentary left dentary.

MACN-PV-CH 1616: Anterior mandible.

MACN-PV CH 1627: Fragmetary mandible.