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The class Mammalia (mammals) is divided into two subclasses based on reproductive techniques: egg-laying mammals (monotremes) and mammals which give live birth (therians). The latter subclass is divided into two infraclasses: pouched mammals (marsupials) and placental mammals (eutherians).

This list contains the monotremes and marsupials. For placental mammals, see List of placental mammals.

Subclass Prototheria (the monotremes)[editar]

Orden Monotremata (monotremes, egg-laying mammals)[editar]

Subclass Theria[editar]

Infraclass Metatheria (marsupials)[editar]

Orden Didelphimorphia (American opossums)[editar]

Virginia opossum (Didelphis virginiana)

Orden Paucituberculata (shrew opossums)[editar]

Orden Microbiotheria (monito del monte)[editar]

Orden Notoryctemorphia (marsupial moles)[editar]

Orden Dasyuromorphia (marsupial carnivores)[editar]

Thylacine (Thylacinus cynocephalus)

Orden Peramelemorphia (bandicoots and bilbies)[editar]

Eastern barred bandicoot

Orden Diprotodontia (diprotodont marsupials)[editar]

SubOrden Vombatiformes (wombats and koalas)[editar]
SubOrden Phalangeriformes (possums and gliders)[editar]
SubOrden Macropodiformes (kangaroos, wallaroos, wallabies)[editar]