life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
       Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
         Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002
           Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
             Phylum Chordata Bateson, 1885 - chordates
               Subphylum Vertebrata Cuvier, 1812 - vertebrates
                 Infraphylum Gnathostomata Gegenbaur, 1874 - jawed vertebrates see Superclass Gnathostomata Gegenbaur, 1874
                   Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
                     Subclass Sarcopterygii Romer, 1955 see Clade Sarcopterygii Romer, 1955
                       Infraclass †Tetrapodomorpha Ahlberg, 1991 see [unranked] Tetrapodomorpha Ahlberg, 1991
                         Superclass Tetrapoda Goodrich, 1930 - tetrapods see Clade Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
                           Class Neotetrapoda
                             Superorder Reptiliomorpha Säve-Söderbergh, 1934 see [unranked] Reptiliomorpha Säve-Söderbergh, 1934
                               Order Unnamed
                                 Series Amniota Haeckel, 1866 see Clade Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988]
                                   Class Synapsida Osborn, 1903 see Clade Synapsida Osborn 1903 [Gauthier et al. 1989]
                                     Order Unnamed
                                       Suborder Unnamed
                                         Order †Therapsida Broom, 1905 see [unranked] Therapsida Broom, 1905
                                           Suborder †Cynodontia Owen, 1861 - cynodonts see Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]
                                             Infraorder Probainognathia see [unranked] Probainognathia Hopson, 1990
                                               Infrasuborder Mammaliamorpha see Clade Mammaliamorpha Rowe 1988
                                                 Class Mammalia Linnaeus, 1758 - mammals
                                                   Class Mammalia
                                                     Superdivision Theriimorpha see Clade Theriimorpha Rowe 1993
                                                       Division Theriiformes Rowe, 1988 see Clade Theriiformes Rowe 1988
                                                         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
                                                           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
                                                             Sublegion Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
                                                               Infralegion Theria Parker & Haswell, 1897 see Subclass Theria Parker & Haswell, 1897
                                                                 Supercohort Metatheria Huxley, 1880 see Infraclass Metatheria Huxley, 1880
                                                                   Cohort Marsupialia Jameson, 1818 - marsupials
                                                                     Order Didelphimorphia Gill, 1872 [monotypic]
                                                                       1 Family Didelphidae Gray, 1821 - American opossums