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 Metachirus Burmeister, 1854 - brown "four-eyed" opossum
             1 Metachirus nudicaudatus (Geoffroy Saint-Hilaire, 1803) - brown four-eyed opossum