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 marsupialis Linnaeus, 1758 - common opossum [Didelphis marsupialis marsupialis]ᵀ Linnaeus, 1758