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
           Genus Thomasomys Coues, 1884 - Thomas's paramo mice
             01 Thomasomys aureus Tomes, 1860
             02 Thomasomys baeops Thomas, 1899
             03 Thomasomys bombycinus Anthony, 1925
             04 Thomasomys cinereiventer J. A. Allen, 1912
             05 Thomasomys cinereus Thomas, 1882
             06 Thomasomys daphne Thomas, 1917
             07 Thomasomys eleusis Thomas, 1926
             08 Thomasomys gracilis Thomas, 1917
             09 Thomasomys hylophilus Osgood, 1912
             10 Thomasomys incanus Thomas, 1894
             11 Thomasomys ischyurus Osgood, 1914
             12 Thomasomys kalinowskii Thomas, 1894
             13 Thomasomys ladewi Anthony, 1926
             14 Thomasomys laniger Thomas, 1895
             15 Thomasomys monochromos Bangs, 1900
             16 Thomasomys niveipes Thomas, 1896
             17 Thomasomys notatus Thomas, 1917
             18 Thomasomys oreas Anthony, 1926
             19 Thomasomys paramorum Thomas, 1898
             20 Thomasomys pyrrhonotus Thomas, 1886
             21 Thomasomys rhoadsi Stone, 1914
             22 Thomasomys rosalinda Thomas & St. Leger, 1926
             23 Thomasomys silvestris Anthony, 1924
             24 Thomasomys taczanowskii Thomas, 1882
             25 Thomasomys vestitus Thomas, 1898