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 Monodelphis Burnett, 1830 - short-tailed opossums Monodelphis scalops (Thomas, 1888) - long-nosed short-tailed opossum