New pieces have been added to the puzzle of the evolution of some of the oldest fish that lived on Earth more than 400 million years ago. In two separate studies, experts in Australia and China have found new clues about primitive lungfishes, the closest living relatives of land vertebrates. The new research builds on long-running work by Flinders University and other paleontologists in the fossil-rich Gogo site in Western Australia's far north, and with the Chinese Academy of Sciences.