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 Marmosops Matschie, 1916
             Marmosops incanus (Lund, 1840) - gray slender opossum