Class Mammalia Linnaeus, 1758 - mammals Order Didelphimorphia Gill, 1872 Family Didelphidae Gray, 1821 - American opossums Subfamily Didelphinae Gray, 1821 Genus Gracilinanus Gardner & Creighton, 1989 Gracilinanus agilis (Burmeister, 1854) - agile gracile opossum