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 Chironectes Illiger, 1811 - yapok
             Chironectes minimus (Zimmermann, 1780) - water opossum
               Chironectes minimus panamensis Goldman, 1914