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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.

Silvabestius johnnilandi
https://australianmuseum.net.au/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://australianmuseum.net.au/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.

Nimiokoala greystanesi
https://australianmuseum.net.au/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.

Trilophosuchus rackhami
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/trilophosuchus-rackhami/

Trilophosuchus rackhami was a small mekosuchine crocodile from the early Miocene of northern Australia. It had a short, deep head, large eyes and three longitudinal ridges along its skull (giving it its name).

Baru darrowi
https://australianmuseum.net.au/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.

Alamitophis tingamarra
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/alamitophis-tingamarra/

Alamitophis tingamarra was a small Eocene madtsoiid, an extinct family of primitive snakes known mainly from Gondwana. Madtsoiids have the longest fossil record of any group of snakes, with a record that stretches from about 90 million to 100,000 years ago.

Genyornis newtoni
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/genyornis-newtoni/

Genyornis newtoni

Steropodon galmani
https://australianmuseum.net.au/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.

Paljara tirarense
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/paljara-tirarense/

Paljara tirarense was a small ringtail possum (family Pseudocheiridae) from the early Miocene of South Australia and northwestern Queensland. Ringtail possums were once much more diverse than they are today, distributed across many now-dry parts of Australia that were forested during the Cainozoic.