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 Thylamys Gray, 1843
             Thylamys karimii (Petter, 1968) - Karimi's fat-tailed mouse opossum