Class Mammalia Linnaeus, 1758 - mammals
   Order Didelphimorphia Gill, 1872
     Family Didelphidae Gray, 1821 - American opossums
       Subfamily Didelphinae Gray, 1821
         Genus Monodelphis Burnett, 1830 - short-tailed opossums
           Monodelphis emiliae (Thomas, 1912) - Emilia's short-tailed opossum