Mammaliaformes Rowe 1988, nom. cl. inval.
see Clade Mammaliaformes Rowe 1988 [Rowe 2020]
Period: Late Triassic - Present [237 Mya - present]; Status: extant
[crown] Class Mammalia Linnaeus, 1758 - mammals
Period: Late Triassic - Present [237 Mya - present]; Status: extant
Subclass Theriiformes Rowe, 1988
see Division Theriiformes Rowe, 1988
Period: Late Triassic - Present [237 Mya - present]; Status: extant
Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995
see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
Period: Late Triassic - Present [237 Mya - present]; Status: extant
Superlegion Trechnotheria McKenna, 1975
see Clade Trechnotheria McKenna 1975
Period: Early Jurassic - Present [201.3 Mya - present]; Status: extant
Legion Cladotheria McKenna, 1975
see Clade Cladotheria McKenna 1975
Period: Middle Jurassic - Present [174.1 Mya - present]; Status: extant
Sublegion Zatheria McKenna, 1975
see Clade Zatheria McKenna 1975
Period: Middle Jurassic - Present [174.1 Mya - present]; Status: extant
Infralegion Tribosphenida McKenna, 1975
see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
[crown] Supercohort Theria Parker & Haswell, 1897 - therians
see Subclass Theria Parker & Haswell, 1897
Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
Cohort Marsupialia Jameson, 1818 - marsupials
Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
Magnorder Ameridelphia Szalay, 1982
see Clade Ameridelphia Szalay 1982
Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
Order Didelphimorphia Gill, 1872
Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
Family Didelphidae Gray, 1821 - American opossums
Distribution: Africa, Europe, Asia, North, Middle & South America; Period: Late Cretaceous - Present [100.5 Mya - present]; Status: extant
Genus †Bistius Clemens & Lillegraven, 1986
Status: fossil