Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Order Didelphimorphia Gill, 1872 Family Didelphidae Gray, 1821 - American opossums Subfamily Caluromyinae Kirsch & Reig, 1977 Genus Caluromysiops Sanborn, 1951 [monotypic] - black-shouldered opossum Caluromysiops irrupta Sanborn, 1951 - black-shouldered opossum