Mammaliaformes Rowe 1988
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Cohort Placentalia Owen, 1837 - placentals
                     Magnorder Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                       Superorder Preptotheria McKenna, 1975
                         Grandorder Anagalida Szalay & McKenna, 1971 see Order Anagalida Szalay & McKenna, 1971
                           Mirorder Simplicidentata Weber, 1904
                             Order Rodentia Bowdich, 1821 - rodents
                               Suborder Hystricognatha Woods, 1976 see Suborder Hystricomorpha Brandt, 1855
                                 Infraorder Hystricognathi Tullberg, 1899
                                   Parvorder Caviida Bryant & McKenna, 1995 see Parvorder Caviomorpha Wood & Patterson, 1955
                                     Superfamily Octodontoidea Waterhouse, 1839
                                       Family Echimyidae Gray, 1825 - spiny rats
                                         Subfamily Heteropsomyinae Anthony, 1917
                                           01 Genus †Sallamys Hoffstetter & Lavocat, 1970
                                           02 Genus †Protadelphomys Ameghino, 1902
                                           03 Genus †Protacaremys Ameghino, 1902
                                           04 Genus †Acarechimys Patterson, 1965
                                           05 Genus †Chasichimys Pascual, 1967
                                           06 Genus †Pattersomys Pascual, 1967
                                           07 Genus †Eumysops Ameghino, 1888
                                           08 Genus Thrichomys Trouessart, 1881 - punaré
                                           09 Genus †Pampamys Verzi, Vucetich & Montalvo, 1995
                                           10 Genus †Palaeoechimys Spillmann, 1949
                                           11 Genus Proechimys Allen, 1899 - spiny rats
                                           12 Genus Euryzygomatomys Goeldi, 1901 - guiara
                                           13 Genus †Boromys Miller, 1916
                                           14 Genus †Heteropsomys Anthony, 1916
                                           15 Genus ‡Brotomys Miller, 1916
                                           16 Genus Carterodon Waterhouse, 1848
                                           17 Genus †Puertoricomys Woods, 1989
                                           18 Genus Clyomys Thomas, 1916
                                           19 Genus Lonchothrix Thomas, 1920
                                           20 Genus Hoplomys Allen, 1908 - armored rat
                                           21 Genus Mesomys Wagner, 1845