While it is tempting to go with longicollis I have to point out the the scutes on the plastron are missing, exposing the bony plates. The entoplastron plate is forward, not surrounded by the epiplastrons. This does not seem to fit longicollis and probably not even Chlelodina. See Cogger 2014, page 224. We need and opinion from someone who is up on turtles, perhaps Aurthur Georges?