The genus was endemic to Australia , living from the Late Miocene subepoch through the Pleistocene epoch ( around 11.6 mya -- 11,000 years ago ) .
The genus thought to be in existence for approximately 11.59 million years .
The genus was endemic to Australia , living from the Late Miocene subepoch through the Pleistocene epoch ( around 11.6 mya -- 11,000 years ago ) , and thought to be in existence for approximately 11.59 million years .