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 Caluromys Allen, 1900 - woolly opossums Subgenus Mallodelphys Thomas, 1920 Caluromys derbianus (Waterhouse, 1841) - Derby's woolly opossum Caluromys derbianus fervidus (Thomas, 1913)