What the hell is this?

Hahaha.... Went to Pantai Kundur last week and among the many astonishments is this:)

I'm so astonished when i see this, not because i never seen this before, but I get to hold it:)))). Its somewhat called king crab or whatever. And its called 'belangkas' or something. And my friend sweatly ask me if its a crab where is the pincers? I was like.... swt. lol

Hehehe... then i got naughty and flip it upside down. lol

Well, it looks like even small animals struggle to live. And imagine it actually challenge me to a fencing match. lol I let it go though