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Thylacoleo carnifex
https://australianmuseum.net.au/learn/animals/mammals/thylacoleo-carnifex/

Thylacoleo carnifex, the largest carnivorous Australian mammal known, may have hunted other Pleistocene megafauna like the giant Diprotodon. Thylacoleo was one of the first fossil mammals described from Australia, discovered not long after European settlement.

Mythunga camara
https://australianmuseum.net.au/learn/animals/reptiles/mythunga-camara/

Mythunga camara

Chunia illuminata
https://australianmuseum.net.au/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.

Yarala burchfieldi
https://australianmuseum.net.au/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://australianmuseum.net.au/learn/australia-over-time/extinct-animals/procoptodon-goliah/

Procoptodon goliah

Wakaleo vanderleuri
https://australianmuseum.net.au/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://australianmuseum.net.au/learn/australia-over-time/extinct-animals/euryzygoma-dunense/

Euryzygoma dunense

Liasis dubudingala
https://australianmuseum.net.au/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://australianmuseum.net.au/learn/australia-over-time/extinct-animals/diprotodon-optatum/

Diprotodon optatum

Murgonemys braithwaitei
https://australianmuseum.net.au/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.