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 Mesomys Wagner, 1845
             1 Mesomys didelphoides (Desmarest, 1817)
             2 Mesomys hispidus (Desmarest, 1817)
             3 Mesomys leniceps Thomas, 1926
             4 Mesomys obscurus (Wagner, 1840) see Makalata obscura (Wagner, 1840)
             5 Mesomys stimulax Thomas, 1911