Class Mammalia Linnaeus, 1758 - mammals Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Family Didelphidae Gray, 1821 - American opossums Genus Chironectes Illiger, 1811 - yapok 1 Chironectes minimus (Zimmermann, 1780) - water opossum