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 Marmosops Matschie, 1916 Marmosops fuscatus (Thomas, 1896) - dusky slender opossum [Marmosops fuscatus fuscatus]ᵀ (Thomas, 1896)