Wikipedia
Meiolaniidae is an extinct family of large, possibly herbivorous turtles with heavily armored heads and tails. They are best known from the last surviving genus, Meiolania, which lived in the rain forests of Australia from the Oligocene until the Pleistocene, and relict populations that lived on Lord Howe Island and New Caledonia until 2000 years ago. A similar form is also known from the Miocene Saint Bathans Fauna of New Zealand.
The family was once thought to have originated in Australia sometime in the Oligocene, when the earliest Meiolania first appeared. However, due to the discovery of South American meiolaniids, including Crossochelys and Niolamia in Eocene Argentina, it is now believed that the meiolaniids appeared sometime prior to the breakup of Gondwana during the Cretaceous. Though once believed to be cryptodires, meiolaniids are outside of the Testudines crown-group, potentially indicating that their origin is even further back.New evidence from the Palaeocene of Patagonia (Argentina) on the evolution and palaeo-biogeography of Meiolaniformes (Testudinata, new taxon name), Journal of Systematic Palaeontology
Volume 11, Issue 7, 2013, DOI:10.1080/14772019.2012.708674 Several basal non-testudine turtles possibly related to meionaliids are known in both laurasian and gondwanann landmasses in the Cretaceous, such as the Asian Mongolochelys.