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 Otomyinae Thomas, 1897 - African swamp rats see Subfamily Murinae Batsch, 1788
           Genus Parotomys Thomas, 1918 - Karroo rats
             1 Parotomys brantsii A. Smith, 1834 - Brant's whistling rat
             2 Parotomys littledalei Thomas, 1918 - Littledale's whistling rat
             3 Subgenus Liotomys Thomas, 1918 see Genus Parotomys Thomas, 1918