Alphadontinae
Alphadontinae (binomen a Marshall et al anno 1990 inventum) est subfamilia mammalium marsupialium.

Systema taxinomicum Animalis 
Imperium: Eucaryota 
Regnum: Animalia 
Gradus: Metazoa 
Subgradus: Eumetazoa 
Subregnum: Bilateria 
Infraregnum: Eucoelomata 
Supraphylum: Deuterostomia 
Infraphylum: Chordonia 
Phylum: Chordata 
Subphylum: Vertebrata 
Infraphylum: Gnathostomata 
Supraclassis: Tetrapoda 
Infraclassis: Amniota 
Ramus: Mammaliaformes 
Classis: Mammalia 
Subclassis: Theriiformes 
Infraclassis: Holotheria 
Supralegio: Trechnotheria 
Legio: Cladotheria 
Sublegio: Zatheria 
Infralegio: Tribosphenida 
Supracohors: Theria 
Cohors: Marsupialia 
Magnaordo: Ameridelphia 
Ordo: Didelphimorphia 
Familia: Didelphidae 
Subfamilia: †Alphadontinae (Marshall et al, 1990) 
Genus: †Alphadon
Genus: †Albertatherium

Didelphidae