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 Marmosa Gray, 1821 Marmosa noctivaga group see Genus Marmosops Matschie, 1916 Marmosa yungasensis Tate, 1931 see Marmosops dorothea (Thomas, 1911)