Mammaliaformes Rowe 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511
[crown] Class Mammalia Linnaeus, 1758 - mammals
Ref: M.C. McKenna & S.K. Bell, 1997: 35
Subclass Theriiformes Rowe, 1988
see Division Theriiformes Rowe, 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 36 [new rank]
Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995
see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new rank]
Superlegion Trechnotheria McKenna, 1975
see Clade Trechnotheria McKenna 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new position]
Legion Cladotheria McKenna, 1975
see Clade Cladotheria McKenna 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 45
Sublegion Zatheria McKenna, 1975
see Clade Zatheria McKenna 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 48
Infralegion Tribosphenida McKenna, 1975
see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
Ref: M.C. McKenna & S.K. Bell, 1997: 48 [new rank]
[crown] Supercohort Theria Parker & Haswell, 1897 - therians
see Subclass Theria Parker & Haswell, 1897
Ref: M.C. McKenna & S.K. Bell, 1997: 49 [new rank]
Cohort Placentalia Owen, 1837 - placentals
Ref: M.C. McKenna & S.K. Bell, 1997: 80 [new rank]
Magnorder Epitheria McKenna, 1975
see Cohort Placentalia Owen, 1837
Ref: M.C. McKenna & S.K. Bell, 1997: 102 [new rank]
Superorder Preptotheria McKenna, 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 104 [new position]
Grandorder Ungulata Linnaeus, 1766
Ref: M.C. McKenna & S.K. Bell, 1997: 357
Mirorder †Meridiungulata McKenna, 1975 - South American ungulates
see Grandorder Meridiungulata McKenna, 1975
Ref: M.C. McKenna & S.K. Bell, 1997: 450
Order †Notoungulata Roth, 1903
Ref: M.C. McKenna & S.K. Bell, 1997: 455
Suborder †Hegetotheria Simpson, 1945
Ref: M.C. McKenna & S.K. Bell, 1997: 465
?Genus †Eopachyrucos Ameghino, 1901
Ref: M.C. McKenna & S.K. Bell, 1997: 465