Class Mammalia Linnaeus, 1758 - mammals
   Order Didelphimorphia Gill, 1872
     Family Didelphidae Gray, 1821 - American opossums
       Subfamily Didelphinae Gray, 1821
         Genus Metachirus Burmeister, 1854 - brown "four-eyed" opossum
           Metachirus nudicaudatus (Geoffroy Saint-Hilaire, 1803) - brown four-eyed opossum