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 Metachirus Burmeister, 1854 - brown "four-eyed" opossum Metachirus nudicaudatus (Geoffroy Saint-Hilaire, 1803) - brown four-eyed opossum Metachirus nudicaudatus tschudii Allen, 1900