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In page Fauna of Australia:

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Australia has indigenous placental mammals from two orders: the bats — order Chiroptera — represented by six families; and the mice and rats — order Rodentia, family Muridae. There are only two endemic genera of bats,[2] although 7% of the world's bat species live in Australia.[3] Rodents first arrived in Australia 5–10 MYA,[2] undergoing a wide radiation to produce the species collectively known as the "old endemic" rodents.[4] The old endemics are represented by 14 extant genera.[citation needed] A million years ago, the rat entered Australia from New Guinea and evolved into seven species of Rattus, collectively called the "new endemics".[4]