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 incana (Lund, 1841[1840]) see Marmosops incanus (Lund, 1840)