Species: antiquus SIMPSON, 1926
Etymology: Latin, antiqua, "ancient."

Genholotype: YPM 13764

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Most of a right dentary.

Referred material:

HERRERA-FLORES, STUBBS & SOUR-TOVAR, 2022

USNM 26088: A fragment of a left dentary with remains of 2 caniniform teeth, one of them complete.