Alphadontidae was a family of mammals belonging to the clade
Metatheria
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a more inclusive group than the marsupials; it contains all marsupials as wel ...
, the group of mammals that includes modern-day
marsupials.
References
{{Taxonbar, from=Q11904934
Prehistoric mammal families
Prehistoric metatherians