Class [Mammalia] Linnaeus, 1758 - mammals Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Family Didelphidae Gray, 1821 - American opossums Genus Micoureus Lesson, 1842 Micoureus alstoni (Allen, 1900) - Alston's mouse opossum