Appearance (Morphology)
Three distinct body regions: head, thorax (where the legs and wings are attached), abdomen.
Part of the thorax is elongated to create a distinctive 'neck'.
Front legs modified as raptorial graspers with strong spikes for grabbing and holding prey.
Large compound eyes on the head which moves freely around (up to 180°) and three simple eyes between the compound eyes.
Incomplete or simple metamorphosis (hemimetabolous).
Adult Males and Females
Females usually have heavier abdomen and are larger than males.
Immatures (different stages)
A distinct Styrofoam-like egg case protects Mantid eggs throughout the winter. Up to 200 or more nymphs may emerge from the egg case. The nymphs look like adults except for size and the sexual definition. Coloration and patterns in the nymph stage may be different than the adult.
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参考资料：http://insected.arizona.edu/mantidinfo.htm