Class [Mammalia] Linnaeus, 1758 - mammals
   Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818
     Family Didelphidae Gray, 1821 - American opossums
       Genus Thylamys Gray, 1843
         1 Thylamys elegans (Waterhouse, 1839) - elegant fat-tailed mouse opossum
         2 Thylamys grisea (Desmarest, 1827) see Thylamys macrura (Olfers, in W.L. Eschwege, 1818)
         3 Thylamys karimii (Petter, 1968) - Karimi's fat-tailed mouse opossum
         4 Thylamys lepida Thomas, 1888 see Marmosa lepida (Thomas, 1888)
         5 Thylamys pusilla (Desmarest, 1804) see Thylamys pusillus (Desmarest, 1804)
         6 Thylamys tatei (Handley, 1957) - Tate's fat-tailed mouse opossum
         7 Thylamys velutina (Wagner, 1842) see Thylamys velutinus (Wagner, 1842)