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 Neacomys Thomas, 1900 - bristly mice
             1 Neacomys guianae Thomas, 1905
             2 Neacomys pictus Goldman, 1912
             3 Neacomys spinosus Thomas, 1882
             4 Neacomys tenuipes Thomas, 1900