Class Mammalia Linnaeus, 1758 - mammals
   Order Didelphimorphia Gill, 1872
     Family Didelphidae Gray, 1821 - American opossums
       Subfamily Didelphinae Gray, 1821
         Genus Marmosa Gray, 1821 - murine opossums
           Marmosa xerophila Handley & Gordon, 1979 - Guajira mouse opossum