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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.

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

Procoptodon goliah

Kronosaurus queenslandicus
https://australian.museum/learn/australia-over-time/extinct-animals/kronosaurus-queenslandicus/

Kronosaurus queenslandicus

Riversleigh Rainforest Koala
https://australian.museum/learn/australia-over-time/extinct-animals/nimiokoala-greystanesi/

Nimiokoala greystanesi was a small koala from the early Miocene of northern Australia. It had a longer snout than the living koala but was only about a third of its size. Nimiokoala is represented by a well preserved skull, a significant discovery since koalas are rare in the fossil record.

Baru darrowi
https://australian.museum/learn/australia-over-time/extinct-animals/baru-darrowi/

Baru darrowi, a massive crocodile from the Miocene of northern Australia, was one of the largest of the mekosuchines, an extinct group of Australasian crocodiles. Although about as large as the living Saltwater Crocodile, Baru may have been more terrestrial in its habits.

Powerful Thylacine
https://australian.museum/learn/australia-over-time/extinct-animals/thylacinus-potens/

Thylacinus potens

Phoeniconotius eyrensis
https://australian.museum/learn/australia-over-time/extinct-animals/phoeniconotius-eyrensis/

Phoeniconotius eyrensis

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.

Thylacoleo carnifex
https://australian.museum/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.

Steropodon galmani
https://australian.museum/learn/australia-over-time/extinct-animals/steropodon-galmani/

Steropodon galmani, a platypus-like monotreme from the Early Cretaceous of Australia, was the first Mesozoic mammal discovered from Australia. It is known from an opalised lower jaw with molar teeth found at the mining town of Lightning Ridge in north central New South Wales.