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Chunia illuminata
https://australian.museum/learn/australia-over-time/extinct-animals/chunia-illuminata/

Chunia was a primitive ektopodontid, a distinctive group of Cainozoic Australian possums that may have been specialized seed-eaters. Ektopodontids, first thought to be monotremes, had short faces, large, forward-facing eyes and the most unusual and complex teeth of any marsupial.

Riversleigh Tube-nosed Bandicoot
https://australian.museum/learn/australia-over-time/extinct-animals/yarala-burchfieldi/

Yarala burchfieldi is one of the oldest and smallest bandicoots known, as well as the most archaic. It would have foraged in the forest leaf litter for insects and may have been at least partly carnivorous, like the dasyurids.

Procoptodon goliah
https://australian.museum/learn/australia-over-time/extinct-animals/procoptodon-goliah/

Procoptodon goliah

Wakaleo
https://australian.museum/learn/australia-over-time/extinct-animals/wakaleo-vanderleuri/

Wakaleo vanderleuri was a dog-sized thylacoleonid ('marsupial lion') and one of the largest predators in Australia during the Miocene. Like other thylacoleonids, Wakaleo had teeth that were modified for stabbing and cutting.

Euryzygoma dunense
https://australian.museum/learn/australia-over-time/extinct-animals/euryzygoma-dunense/

Euryzygoma dunense

Liasis dubudingala
https://australian.museum/learn/australia-over-time/extinct-animals/liasis-dubudingala/

Liasis dubudinala is the largest snake known from Australia, estimated to have been about 9 metres in length. The only known specimen of Liasis dubudinala was found at Bluff Downs in northeastern Queensland, and is Pliocene in age (about 4.5 million years old)

Diprotodon optatum
https://australian.museum/learn/australia-over-time/extinct-animals/diprotodon-optatum/

Diprotodon optatum

Murgonemys braithwaitei
https://australian.museum/learn/australia-over-time/extinct-animals/murgonemys-braithwaitei/

Murgonemys braithwaitei, known from a nearly complete shell (carapace), was a trionychid (soft-shelled) turtle and the oldest trionychid from the Southern Hemisphere.

Silvabestius johnnilandi
https://australian.museum/learn/australia-over-time/extinct-animals/silvabestius-johnnilandi/

Silvabestius johnnilandi was a rare, sheep-sized diprotodontoid marsupial, one of the smallest and most primitive discovered to date. Silvabestius would have been a browser, feeding on leaves, stems and other soft parts of plants.

Perameles bowensis
https://australian.museum/learn/australia-over-time/extinct-animals/perameles-bowensis/

Perameles bowensis, from the Pliocene of New South Wales, is one of the oldest and most primitive of the Peramelidae, the family to which most Australian bandicoots belong.