Class Mammalia Linnaeus, 1758 - mammals
   Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818
     Family Didelphidae Gray, 1821 - American opossums
       Genus Marmosa Gray, 1821 - murine opossums
         Subgenus Marmosa Gray, 1821
           Marmosa noctivaga group see Genus Marmosops Matschie, 1916
             Marmosa cracens (Handley & Gordon, in Eisenberg, ed., 1979) see Marmosops cracens (Handley & Gordon, 1979)