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 Philander Brisson, 1762 - gray and black "four-eyed" opossums
             Philander mcilhennyi Gardner & Patton, 1972 - McIlhenny's four-eyed opossum