Holotype:

Locality: West rim of mesa north of Arroyo del Rosario, 6 miles west of El Rosario, El Rosario, Baja California State, Mexico.

Horizon: “EL Gallo Formation”, Middle one-third of the Upper Campanian.

Biostratigraphy:

Age: Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

IGM 4301 (old LACM 66167/20886): 2 premaxillary teeth.

IGM 4302 (old LACM 66167/20886): 2 premaxillary teeth.

IGM 4303 (old LACM 3294/42570): Premaxillary tooth.

IGM 4304 (old LACM 3294/28999): Premaxillary tooth.
Note: Some of these premaxillary teeth are square not ‘D’ shaped in crossection.