’Tribotherians’ (Stem Boreasphenidans)

DESCRIBER    Butler, 1978
TIME    Cretaceous Early
Aptian Albian
CLASS    Mammalia
SUBCLASS    Boreasphenida
ORDER    Incertae Sedis
FAMILY    Incertae Sedis
FOSSILSITE    Trinity Group, Texas, US
INFO

Type species by monotype. Based on the holotype, a dentary fragment with the penultimate premolar in eruption, the deciduous last premolar underlain by its successor, and the first molar.