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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.

Nimbacinus dicksoni
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/nimbacinus-dicksoni/

Nimbacinus dicksoni was a small, fox-sized thylacine, a carnivorous marsupial distantly related to the 'Tasmanian Tiger' (Thylacinus cynocephalus). Thylacines were the main mammalian predators of the Miocene.

Thylacinus potens
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/thylacinus-potens/

Thylacinus potens

Dromornis planei (Bullockornis planei)
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/dromornis-planei-bullockornis-planei/

Dromornis planei (Bullockornis planei)

Obdurodon dicksoni
https://australianmuseum.net.au/learn/australia-over-time/extinct-animals/obdurodon-dicksoni/

Obdurodon dicksoni

Platypterygius australis
https://australianmuseum.net.au/learn/dinosaurs/fact-sheets/platypterygius-australis/

Platypterygius longmani was an ichthyosaur, a dolphin-like marine reptile that roamed the Eromanga Sea of inland Australia during the Early Cretaceous.

Minmi paravertebra
https://australianmuseum.net.au/learn/dinosaurs/fact-sheets/minmi-paravertebra/

Minmi paravertebra was an ankylosaur, a quadrupedal dinosaur covered in bony armour. It was discovered in 1964 near Minmi Crossing, Queensland, and was the first ankylosaur known from the Southern Hemisphere.

Muttaburrasaurus langdoni
https://australianmuseum.net.au/learn/dinosaurs/fact-sheets/muttaburrasaurus-langdoni/

Muttaburrasaurus was a large, plant-eating ornithopod from the Early Cretaceous of eastern Australia.

Kambara implexidens
https://australianmuseum.net.au/learn/dinosaurs/fact-sheets/kambara-implexidens/

Kambara implexidens, from the early Eocene of Queensland, was a mekosuchine, an ancient group of primitive Gondwanan crocodiles.