’Tribotherians’ (Stem Boreasphenidans)

DESCRIBER    Cifelli, 1990
TIME    Cretaceous Late
Campanian
CLASS    Mammalia
SUBCLASS    Boreasphenida
ORDER    Aegialodontidae
FAMILY    Incertae Sedis
FOSSILSITE    Wahweap Formation, Utah, US
INFO

Type species by monotype. Represented only by the holotype (incomplete upper molar, with broken parastylar wing)