Class Mammalia Linnaeus, 1758 - mammals
   Order Didelphimorphia Gill, 1872
     Family Didelphidae Gray, 1821 - American opossums
       Subfamily Didelphinae Gray, 1821
         Genus Marmosops Matschie, 1916
           Marmosops dorothea (Thomas, 1911) - Dorothys' slender opossum