Class [Mammalia] Linnaeus, 1758 - mammals Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Family Didelphidae Gray, 1821 - American opossums Genus Metachirus Burmeister, 1854 - brown "four-eyed" opossum Metachirus nudicaudatus (Geoffroy Saint-Hilaire, 1803) - brown four-eyed opossum