Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
         Subfamily Sigmodontinae Wagner, 1843
           01 Genus Abrawayaomys Cunha & Cruz, 1979
           02 Genus Aepeomys Thomas, 1898
           03 Genus Akodon Meyen, 1833 - South American field mice
           04 Genus Andalgalomys Williams & Mares, 1978 see Genus Graomys Thomas, 1916
           05 Genus Andinomys Thomas, 1902 - Andean mouse
           06 Genus Anotomys Thomas, 1906 - fish-eating rat
           07 Genus Auliscomys Osgood, 1915
           08 Genus Baiomys True, 1894 - pygmy mice
           09 Genus Bibimys Massoia, 1979 - crimson-nosed rats
           10 Genus Blarinomys Thomas, 1896 - Brazilian shrew-mouse
           11 Genus Bolomys Thomas, 1916
           12 Genus Calomys Waterhouse, 1837 - vesper mice
           13 Genus Chelemys Thomas, 1903 - greater long-clawed mice
           14 Genus Chibchanomys Voss, 1988 - Chibchan water mouse
           15 Genus Chilomys Thomas, 1897 - Colombian forest mouse
           16 Genus Chinchillula Thomas, 1898 - Altiplano chinchilla mouse
           17 Genus Chroeomys Thomas, 1916 see Genus Abrothrix Waterhouse, 1837
           18 Genus Delomys Thomas, 1917
           19 Genus Eligmodontia Cuvier, 1837 - highland desert mice
           20 Genus Euneomys Coues, 1874 - Patagonian chinchilla-mice
           21 Genus Galenomys Thomas, 1916
           22 Genus Geoxus Thomas, 1919 - long-clawed mole mouse
           23 Genus Graomys Thomas, 1916
           24 Genus Habromys Hooper & Musser, 1964 - crested-tailed deer mice and slender-tailed deer mice
           25 Genus Hodomys Merriam, 1894 - Allen's wood rat
           26 Genus Holochilus Brandt, 1835 - web-footed rats
           27 Genus Ichthyomys Thomas, 1893 - fish-eating rats
           28 Genus Irenomys Thomas, 1919 - Chilean rat
           29 Genus Isthmomys Hooper & Musser, 1964 - yellow deer mouse and Mount Pirri deer mouse
           30 Genus Juscelinomys Moojen, 1965
           31 Genus Kunsia Hershkovitz, 1966 - South American giant rats
           32 Genus Lenoxus Thomas, 1909 - Andean rat
           33 Genus Megadontomys Merriam, 1898 - Thomas's deer mouse
           34 Genus ‡Megalomys Trouessart, 1881 - West Indian giant rice rats
           35 Genus Melanomys Thomas, 1902
           36 Genus Microryzomys Thomas, 1917
           37 Genus Neacomys Thomas, 1900 - bristly mice
           38 Genus Nectomys Peters, 1861 - Neotropical water rats
           39 Genus Nelsonia Merriam, 1897 - Nelson's wood rat
           40 Genus Neotoma Say & Ord, 1825 - woodrats
           41 Genus Neotomodon Merriam, 1898 - Mexican volcano mouse
           42 Genus Neotomys Thomas, 1894 - Andean swamp rat
           43 Genus Nesoryzomys Heller, 1904 - Galapagos rice rats
           44 Genus Neusticomys Anthony, 1921 - fish-eating rats
           45 Genus Notiomys Thomas, 1890 - long-clawed mouse
           46 Genus Nyctomys Saussure, 1860 - vesper rat
           47 Genus Ochrotomys Osgood, 1909 - golden mouse
           48 Genus Oecomys Thomas, 1906 - bicolored rice rats
           49 Genus Oligoryzomys Bangs, 1900
           50 Genus Onychomys Baird, 1857 - grasshopper mice
           51 Genus Oryzomys Baird, 1857 - rice rats
           52 Genus Osgoodomys Hooper & Musser, 1964 - Michoacán deer mouse
           53 Genus Otonyctomys Anthony, 1932 - Yucatan vesper rat
           54 Genus Ototylomys Merriam, 1901 - big-eared climbing rat
           55 Genus Oxymycterus Waterhouse, 1837 - burrowing mice
           56 Genus Peromyscus Gloger, 1841 - white-footed mice
           57 Genus Phaenomys Thomas, 1917 - Rio de Janeiro rice rat
           58 Genus Phyllotis Waterhouse, 1837 - leaf-eared mice
           59 Genus Podomys Osgood, 1909 - Florida mouse
           60 Genus Podoxymys Anthony, 1929 - Mount Roraima mouse
           61 Genus Pseudoryzomys Hershkovitz, 1959
           62 Genus Punomys Osgood, 1943 - puna mouse
           63 Genus Reithrodon Waterhouse, 1837 - coney rat
           64 Genus Reithrodontomys Giglioli, 1873 - American harvest mice
           65 Genus Rhagomys Thomas, 1917 - Brazilian arboreal mouse
           66 Genus Rheomys Thomas, 1906 - water mice
           67 Genus Rhipidomys Tschudi, 1844 - climbing mice
           68 Genus Scapteromys Waterhouse, 1837 - water rat
           69 Genus Scolomys Anthony, 1924 - spiny mouse
           70 Genus Scotinomys Thomas, 1913 - brown mice
           71 Genus Sigmodon Say & Ord, 1825 - cotton rats
           72 Genus Sigmodontomys Allen, 1897
           73 Genus Thalpomys Thomas, 1916
           74 Genus Thomasomys Coues, 1884 - Thomas's paramo mice
           75 Genus Tylomys Peters, 1866 - climbing rats
           76 Genus Wiedomys Hershkovitz, 1959 - red-nosed mouse
           77 Genus Wilfredomys Avila Pires, 1960
           78 Genus Xenomys Merriam, 1892 - Magdalena rat
           79 Genus Zygodontomys Allen, 1897 - cane mice