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