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 Micoureus Lesson, 1842
             1 Micoureus alstoni (Allen, 1900) - Alston's mouse opossum
             2 Micoureus constantiae (Thomas, 1904) - white-bellied woolly mouse opossum
             3 Micoureus demerarae (Thomas, 1905) - woolly mouse opossum
             4 Micoureus paraguayanus (Tate, 1931) - Tate's woolly mouse opossum
             5 Micoureus phaeus (Thomas, 1899) - little woolly mouse opossum
             6 Micoureus regina (Thomas, 1898) - bare-tailed woolly mouse opossum