Holotype:

Locality: Terlingua local fauna, OMNH V58 (TMM 43057), 8 km NNE Study Butte, Brewster County, Big Bend of the Rio Grande, Texas.

Horizon: Basal upper shale member, Agua Formation.

Biostratigraphy:

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

Material:

TMM 43057-62: Lower 4th premolar.

TMM 43057-63: Lower 4th premolar.

TMM 43057-64: Lower 4th premolar.

OMNH 2267: Lower 4th premolar.

OMNH 25089: Lower 4th premolar.

4 more lower 4th premolars.