Mammaliaformes Rowe 1988, nom. cl. inval. see Clade Mammaliaformes Rowe 1988 [Rowe 2020]
   [crown clade] Mammalia Linnaeus, 1758 - mammals
     Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown clade] Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Placentalia Owen, 1837 - placentals
                     Xenarthra Cope, 1889 - xenarthrans see Superorder Xenarthra Cope, 1889
                       Pilosa Flower, 1883 - sloths
                         Phyllophaga Owen, 1842 see Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
                           Megatheria McKenna & Bell, 1997
                             Megatherioidea Gray, 1821
                               Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
                                 Megalonychinae Gervais, 1855
                                   1 †Pliometanastes Hirschfeld & Webb, 1968
                                   2 †Sinclairia Ameghino, 1912, nom. dub.
                                   3 †Megalonychops Kraglievich, 1926
                                   4 †Valgipes Gervais, 1874
                                   5 †Meizonyx Webb, 1985
                                   6 †Megalonychini Gervais, 1855
                                   7 Choloepodini Gray, 1871