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
             01 Thylamys cinderella (Thomas, 1902) - Cinderella fat-tailed mouse opossum
             02 Thylamys elegans (Waterhouse, 1839) - elegant fat-tailed mouse opossum
             03 Thylamys karimii (Petter, 1968) - Karimi's fat-tailed mouse opossum
             04 Thylamys macrurus (Olfers, 1818) - Paraguayan fat-tailed mouse opossum
             05 Thylamys pallidior (Thomas, 1902) - white-bellied fat-tailed mouse opossum
             06 Thylamys pusillus (Desmarest, 1804) - common fat-tailed mouse opossum
             07 Thylamys sponsorius (Thomas, 1921) - Argentine fat-tailed mouse opossum
             08 Thylamys tatei (Handley, 1957) - Tate's fat-tailed mouse opossum
             09 Thylamys velutinus (Wagner, 1842) - dwarf fat-tailed mouse opossum
             10 Thylamys venustus (Thomas, 1902) - buff-bellied fat-tailed mouse opossum