As for the species, I can only get down to the genus which is Austrothelphusa/Holthuisana. I'm not sure what they have finally been classified as. It is one of those two.
http://www.amonline.net.au/sand/news/fr ... _crabs.htm
http://www.geocities.com/athens/delphi/ ... d_crab.htm
Freshwater land crabs, Holthuisana spp. (family Sundathelphusidae), is common in and around freshwater streams, ponds and swamps. It burrows into the ground or stream banks.