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
           1 Genus Carterodon Waterhouse, 1848
           2 Genus Clyomys Thomas, 1916
           3 Genus Euryzygomatomys Goeldi, 1901 - guiara
           4 Genus Hoplomys Allen, 1908 - armored rat
           5 Genus Lonchothrix Thomas, 1920
           6 Genus Mesomys Wagner, 1845
           7 Genus Proechimys Allen, 1899 - spiny rats
           8 Genus Thrichomys Trouessart, 1881 - punaré