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 Murinae Batsch, 1788 - Old World mice and rats
           Genus Tokudaia Kuroda, 1943 - Ryukyu spiny rat
             1 Tokudaia muenninki Johnson, 1946
             2 Tokudaia osimensis (Abe, 1934) - Ryukyu spiny rat