Meniscoessus sp.
Late Cretaceous (Maastrichtian)
Hell Creek Formation
McCone county
Montana, USA.

Named for the numerous cusps covering their teeth, Meniscoessus possessed highly specialized dentition adapted for processing seeds, fruits, roots, and other plant material. These mammals were small, agile animals that lived alongside dinosaurs in the forests and floodplains of western North America.
4mm fully rooted multituberculate tooth.