Class Mammalia Linnaeus, 1758 - mammals
Count: [*†*] 5o; †16o;76f;282g;438s
Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians
see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
Count: [*†*] 4o; †5o;24f;82g;141s
Infraclass Eutheria Gill, 1872
Count: [*†*] 2o; †3o;12f;40g;62s
Magnorder Epitheria McKenna, 1975
see Cohort Placentalia Owen, 1837
Count: [*†*] 2o; †3o;11f;35g;56s
Superorder Ungulatomorpha Archibald, 1996
Count: [†*] †2o;4f;15g;20s
Order †"Condylarthra" Cope, 1881 [paraphyletic]
Count: [†*] †2f;4g;4s
Family †Periptychidae Cope, 1882
Count: [†*] †1g;1s
1 Genus †"Mimatuta" Van Valen, 1978 [paraphyletic?]
Count: [†*] †1s