Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Order Didelphimorphia Gill, 1872 Family Didelphidae Gray, 1821 - American opossums Subfamily Didelphinae Gray, 1821 Genus Didelphis Linnaeus, 1758 - large American opossums Didelphis imperfecta Mondolfi & Pérez-Hernández, 1984 - Guianan white-eared opossum