LONGRICH, MAKOVICKY, TOKARYK, COOPER, SAITTA, ERICKSON, SZELKELY & SNIVELY, 2026

Locality: Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

YPM 55587: Premaxillary tooth of a hatchling.