May 18 Praying Mantis Egg Case A praying mantis is a fascinating insect. I purchased egg cases that can hold hundreds of eggs. They finally hatched! The praying mantis life cycle is an example of incomplete metamorphosis because there are only three stages- egg, nymph, and adult. Posted May 18, 2019 by pbright2 in category Science Post navigation Shells and Hermit Crabs Entrepreneurs