Order Polyprotodontia (Owen, 1866) Suborder Didelphimorphia Gill, 1872 see Order Didelphimorphia Gill, 1872 Superfamily Didelphoidea Gray, 1821 1 Family Didelphidae Gray, 1821 - American opossums 2 Family Microbiotheriidae Ameghino, 1887