did it just molt? it may have lost it in a molting complication. Or it could have been injured in use. It should grow back in time, given several molts.
great looking mantis by the way. Ever consider adding some sand? They really like digging around in it, good enrichment activity for them. A smart animal likes this needs to be kept occupied.
Edit: It hasn't killed the shrimp in there?!! i think you got a broken mantis....
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