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 Calomys Waterhouse, 1837 - vesper mice
             1 Calomys boliviae Thomas, 1901
             2 Calomys callidus Thomas, 1916
             3 Calomys callosus Rengger, 1830
             4 Calomys hummelincki Husson, 1960
             5 Calomys laucha Fischer, 1814
             6 Calomys lepidus (Thomas, 1884) - graceful laucha
             7 Calomys musculinus (Thomas, 1913)
             8 Calomys sorellus Thomas, 1900
             9 Calomys tener Winge, 1887