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 scapulata Burmeister, 1856 see Marmosops incanus (Lund, 1840)