Class Mammalia Linnaeus, 1758 - mammals
Order Marsupialia Jameson, 1818 - marsupials
see Cohort Marsupialia Jameson, 1818
Family Didelphidae Gray, 1821 - American opossums
Genus Marmosa Gray, 1821 - murine opossums
Subgenus Thylamys Gray, 1843
see Genus Thylamys Gray, 1843
Marmosa microtarsus group
see Genus Gracilinanus Gardner & Creighton, 1989
Marmosa dryas Thomas, 1898
see Gracilinanus dryas (Thomas, 1898)