The northern snakenecked turtle Chelodina oblonga (formerly rugosa) has some remarkable ways of dealing with unpredictability in the availability of water in the wet-dry tropics of Australia and southern New Guinea. The adults aestivate beneath the drying mud of their billabongs to wait out the dry season, where they are susceptable to traditional harvest by indigenous peoples and exotic predators such as feral pigs. They cope with unpredictability in the timing of the end of the wet season by laying their eggs in saturated soil or even underwater. While innundated, the embryos undergo early developmental arrest stimulated by hypoxia. We have invested much time and energy in unravelling this intriguing reproductive biology. We described closely related species of snakeneck from the sandstone country of Arnhem Land and the Kimberley.


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