On this page you can learn how to distinguish male and female praying mantises. You can do this in two ways; by looking at the number of segments on the abdomen or by looking for external sex differences like the length of the antennae.
Segment counting method
The segment counting method can be used for all praying mantis species that are older than L4 (fourth instar). In some species it is much harder to see than in other species. With small species you may need a magnifying glass.
The basis principle is simple: female praying mantises have 6 abdominal segments while males have 8. The final segment of the female is much larger than the others while the male has several small segments towards the end of the abdomen.
If you have to count the segments, you should look at the underside of the mantis. You cannot count the segments from looking at its back side. The picture will explain it all:
Looking at external differences between males and females
Adult male and female praying mantises are different from each other. This is called sexual dimorphism. The differences become more pronounced as the mantis grows older. This method of determining the sex of the mantis can be used between L5 and L8 instar, depending on the species. Some species look a lot alike while others are very different in body size or other aspects.
Males generally have longer and thicker antennae than females do. This can be seen most clearly when the mantis is adult, but as the nymph grows to become an adult it steadily develops the longer antennae. When comparing male and female nymphs you see that the female has thin hair-like antennae while the male has thick antennae. Species of the Empusidae family have males with feathered antennae (‘hairy’ antennae) while the females have smooth antennae.
Some species have a very clear difference in body size between males and females, for example the Orchid Mantis and the Budwing Mantis. As the mantis nymphs grow, you can start to notice that some nymphs stay behind in size compared to the others. These are the males. When adult the difference is even more obvious as neither of the sexes will grow anymore.
Male praying mantises are generally much more slender than female praying mantises. This can be seen especially well when looking at the thorax. Most species have a pronounced widening in this area, for example the shield of the Dead Leaf Mantis (Deroplatys desiccata), and males have a much smaller widening than the females. This effect becomes more and more pronounced as the mantis nymph becomes older.
Length of the wing
This difference can only be seen in adult mantises. The wings of a male praying mantis are generally longer than those of the females. The wings of the females reach to the end of their body or even do not reach that far, while the wings of the male are never shorter than the body. The wings of the male generally reach past the end of their body, sticking out a bit from the back. This is because male praying mantises will fly to find a mate, while females generally are to heavy to fly.