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 Lestodelphys Tate, 1934 [monotypic] - Patagonian opossum Lestodelphys halli (Thomas, 1921) - Patagonian opossum