Please Help Identify My Crab Species/type.

[deconfrost]

Hi all,

I have recently got a crab free from a shop as he has only one left and couldnt sell it and i was purchasing a tank for rainbow crabs.
So i got this crab back and have no idea what species it is which the shop owner/assistant doesnt know as well.

If anyone can help me with it, i will be very much appreciated so i can have more ideas on how to care for it.