Mammaliaformes Rowe, 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511
[crown clade] Mammalia Linnaeus, 1758
Ref: M.C. McKenna & S.K. Bell, 1997: 35
Theriiformes Rowe, 1988, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 36 [new rank]
Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new rank]
Trechnotheria McKenna, 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new position]
Cladotheria McKenna, 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 45
Zatheria [McKenna, 1975]
Ref: M.C. McKenna & S.K. Bell, 1997: 48
Tribosphenida McKenna, 1975:27, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 48 [new rank]
[crown clade] Theria Parker & Haswell, 1897:448, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 49 [new rank]
Placentalia Owen, 1837:903, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 80 [new rank]
Epitheria McKenna, 1975, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 102 [new rank]
Preptotheria [McKenna, 1975]
Ref: M.C. McKenna & S.K. Bell, 1997: 104 [new position]
Anagalida [Szalay & McKenna, 1971]
Ref: M.C. McKenna & S.K. Bell, 1997: 104-105
Simplicidentata Weber, 1904, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 113 [new rank]
Rodentia [Bowdich, 1821]
Ref: M.C. McKenna & S.K. Bell, 1997: 114 [new position]
Myomorpha [Brandt, 1855]
Ref: M.C. McKenna & S.K. Bell, 1997: 131
Myodonta Schaub in Grassé & Dekeyser, 1955, new rank
Ref: M.C. McKenna & S.K. Bell, 1997: 132 [new rank]
Muroidea [Batsch, 1788]
Ref: M.C. McKenna & S.K. Bell, 1997: 135
Muridae [Batsch, 1788]
Ref: M.C. McKenna & S.K. Bell, 1997: 136
†Afrocricetodontinae [Lavocat, 1973]
Ref: M.C. McKenna & S.K. Bell, 1997: 156
1 †Notocricetodon [Lavocat, 1973]
Ref: M.C. McKenna & S.K. Bell, 1997: 156
2 †Afrocricetodon [Lavocat, 1973]
Ref: M.C. McKenna & S.K. Bell, 1997: 156
3 †Protarsomys [Lavocat, 1973]
Ref: M.C. McKenna & S.K. Bell, 1997: 156