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 Micoureus Lesson, 1842 Micoureus paraguayanus (Tate, 1931) - Tate's woolly mouse opossum Micoureus paraguayanus travassosi (Miranda-Ribeiro, 1936)