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 Thylamys grisea (Desmarest, 1827) see Thylamys macrura (Olfers, in W.L. Eschwege, 1818)