Yea, infact after my Peacock mantis shrimp had been shipped and finally picked it up, it was missing his right dactyl(claw/hammer). I read over some of Roy Caldwell who is pretty sure a mantis shrimp expert, and said when they molt they'll put all the energy into making a whole new claw. After the first molt, there was a small new claw. The second, the claw was about 80% fully healthy, and he started using it, and on his next molt he should have a new, full healthy claw. Other shrimps like CBS (peppermints, cleaners, etc,) will molt new appendages very quickly.