Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     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