The Australian land hermit crab (Coenobita variabilis) is a terrestrial hermit crab species, native to australia. It is a nocturnal, omnivorous crustacean. They are gregarious and thrive in tropical areas near water.
The Australian land hermit crab is endemic to northern parts of Australia including northern Western Australia, Northern Territory and northern Queensland
good old wikipedia!
For the mainland i would say a simple no. I really doubt something like that could remain undectected for this amount of time.
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