Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     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