I purchased a praying mantis egg case and put it in my greenhouse to help get rid of an aphid infestation. Nothing seemed to happen for the longest time, but now it looks like there are hundreds of dead mantises attached to the egg case (and each other, they're like a large growth off the side of the egg case).
Are these mantis dead? I know mantises molt but these bodies look pretty intact (they even have tentacles!). Is this normal?