Class Mammalia Linnaeus, 1758 - mammals Order Didelphimorphia Gill, 1872 Family Didelphidae Gray, 1821 - American opossums Subfamily Didelphinae Gray, 1821 Genus Didelphis Linnaeus, 1758 - large American opossums Didelphis aurita (Wied-Neuwied, 1826) - big-eared opossum