Mammaliaformes Rowe 1988, nom. cl. inval. see Clade Mammaliaformes Rowe 1988 [Rowe 2020]
Period: Late Triassic - Present [237 Mya - present]; Status: extant
   [crown] Class Mammalia Linnaeus, 1758 - mammals
  Period: Late Triassic - Present [237 Mya - present]; Status: extant
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
    Period: Late Triassic - Present [237 Mya - present]; Status: extant
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
      Period: Late Triassic - Present [237 Mya - present]; Status: extant
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
        Period: Early Jurassic - Present [201.3 Mya - present]; Status: extant
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
          Period: Middle Jurassic - Present [174.1 Mya - present]; Status: extant
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
            Period: Middle Jurassic - Present [174.1 Mya - present]; Status: extant
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
              Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
                   Cohort Placentalia Owen, 1837 - placentals
                  Period: Early Cretaceous - Present [145 Mya - present]; Status: extant
                     Magnorder Xenarthra Cope, 1889 - xenarthrans see Superorder Xenarthra Cope, 1889
                    Period: Late Paleocene - Present [59.2 Mya - present]; Status: extant
                       Order Pilosa Flower, 1883 - sloths
                      Period: Middle Eocene - Present [47.8 Mya - present]; Status: extant
                         Suborder Phyllophaga Owen, 1842 see Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
                        Status: extant
                           Infraorder Megatheria McKenna & Bell, 1997
                          Status: extant
                             Superfamily Megatherioidea Gray, 1821
                            Status: extant
                               Family Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
                              Distribution: North, Middle & South America, Antarctic; Period: Middle Eocene - Present [47.8 Mya - present]; Status: extant
                                 Subfamily Megalonychinae Gervais, 1855
                                Status: extant
                                   Tribe Choloepodini Gray, 1871
                                  Status: extant
                                     Subtribe ‡Acratocnina Varona, 1974
                                    Status: extinct
                                       1 Genus †Miocnus Matthew, 1931
                                      Status: fossil
                                       2 Genus †Acratocnus Anthony, 1916 - Puerto Rican ground sloth
                                      Status: fossil
                                       3 Genus ‡Synocnus Paula Couto, 1967 - lesser Haitian ground sloth
                                      Status: extinct