Class Mammalia Linnaeus, 1758 - mammals
   Order Didelphimorphia Gill, 1872
     Family Didelphidae Gray, 1821 - American opossums
       Subfamily Didelphinae Gray, 1821
         Genus Marmosops Matschie, 1916
           Marmosops impavidus (Tschudi, 1845) - Tschudi's slender opossum