Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family Echimyidae Gray, 1825 - spiny rats
         Subfamily Eumysopinae Rusconi, 1935 see Subfamily Heteropsomyinae Anthony, 1917
           Genus Clyomys Thomas, 1916
             1 Clyomys bishopi Ávila-Pires & Wutke, 1981
             2 Clyomys laticeps (Thomas, 1909)