Australidelphia

The Australidelphus (Australidelphia) are a magnorden that includes all marsupial mammals living in Oceania, as well as the order Microbiotheria, endemic to South America.

The Australidelfians appeared on Earth during the Cretaceous in present-day Australia, which then formed the southern continent known as Gondwana together with Antarctica and South America, producing radiation throughout the territory, although they subsequently disappeared from large areas, remaining in the Currently, there is only one representative outside Oceania, the monito de monte (Dromiciops gliroides).

And it is precisely this that the oldest known species most closely resembled.

A summary cladogram of the magnorden is as follows:

- or Magnorden Australidelphia - (Szalay, 1982)
Superorden Microbiotheria - (Ameghino, 1889)
Ameghino, 1889
`-or Superorden Eometatheria - (Simpson, 1970)
(Kirsch, 1977)
Δ-o Orden Yalkaparidontia - Archer et al., 1988 (†)
(Gill, 1872)
(Gill, 1872)
`-or Granorden Syndactyli - (Gill, 1871)
Order Diprotodontia - Owen, 1866
`-or Order Peramelemorphia - (Kirsch, 1968)