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 Altungulata Prothero & Schoch, 1989
Ref: M.C. McKenna & S.K. Bell, 1997: 468 [new rank]
Order Perissodactyla Owen, 1848 - odd-toed ungulates
Ref: M.C. McKenna & S.K. Bell, 1997: 469 [new position]
Suborder Ceratomorpha Wood, 1937
Ref: M.C. McKenna & S.K. Bell, 1997: 473
Infraorder Tapiromorpha Haeckel, 1866
Ref: M.C. McKenna & S.K. Bell, 1997: 478 [new rank]
Superfamily Tapiroidea Gray, 1825
Ref: M.C. McKenna & S.K. Bell, 1997: 487 [new position]
1 Genus †Sastrilophus Sahni & Khare, 1971
Ref: M.C. McKenna & S.K. Bell, 1997: 487
2 Genus †Indolophus Pilgrim, 1925
Ref: M.C. McKenna & S.K. Bell, 1997: 487
3 Family †Helaletidae Osborn, 1892
Ref: M.C. McKenna & S.K. Bell, 1997: 487
4 Family †Isectolophidae Peterson, 1919
Ref: M.C. McKenna & S.K. Bell, 1997: 487
5 Family †Lophiodontidae Gill, 1872
Ref: M.C. McKenna & S.K. Bell, 1997: 488
6 Family †Deperetellidae Radinsky, 1965
Ref: M.C. McKenna & S.K. Bell, 1997: 488
7 Family †Lophialetidae Matthew & Granger, 1925
Ref: M.C. McKenna & S.K. Bell, 1997: 488
8 Family Tapiridae Gray, 1821 - tapirs
Ref: M.C. McKenna & S.K. Bell, 1997: 489