Species: ionensis SIMPSON, 1937
Etymology:

Holotype: AMNH 3219

Locality: Estancia Las Violetas, near Malaspina, Chubut Province, Argentina.

Horizon: Summit of the Salamanca Formation, Upper most Cretaceous or lower most Paleocene.

Biostratigraphy:

Age: Latest Cretaceous, Uppermost Mesozoic or Lowermost Paleocene Epoch, Lower Paleogene Period, Lower Tertiary Subera, Cenozoic Era.

Material: Right dentary and most of the postcranial skeleton.

Referred material:

PASCUAL, ARCHER, JAUREGUIZAR, PARDO, GODTHELP & HAND, 1992

Locality: Banco Negro Inferior, BNI, occurs at 45°30’S, 67°11’W, Golfo de San Jorge, Chubut Province, Central Patagonia, Argentina.

Horizon:

Biostratigraphy:

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

Material:

Number: Not given: