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"The early Australians had many tens of thousands of years to kill the mega fauna. They also may have killed off a pre sapiens homonid about 12,000 years ago called Kow swamp people. In the wall of human evolution in the Smithsonian one of the Kow skulls is in the far right lower corner. It is called homo sapien, but after comparing it to Neanderthal and earlier Heidelbergensis skulls, I am of the opinion it had more in common with the Heidelberg skulls."

Maybe Denisovians?

Kow Swamp People

"The enigma of Kow Swamp is that the skulls are younger than those at Keilor and Willandra Lakes, but appear much more archaic. The people at Kow Swamp had large, long heads with very thick bone, up to 13 mm thick. Their faces were large, wide and projecting, with prominent brow ridges and flat, receding foreheads. From above they show a pronounced inward curvature behind the eye sockets, giving the skull the appearance of a flask. They had enormous teeth and jaws, some even larger than Java Man, Homo erectus (Previously called Pithecanthropus, from the middle Pleistocene of Sangiran."