Gender determination of mantises (sexing)
Males and females of all mantis species can be distinguished by the number of their sternites (the segments you can see on their belly):
Males got 8, females only 6 visible sternites. When mantises reach their fourth instar (L4) you usually can recognize the difference with the naked eye. Often you don´t even have to count. Usually it´s enough just to look at the last segments of the abdomens downside (belly): If the last segment is about as long and wide as the previous one – it´s a female. If the last segments become smaller and thiner – it´s a male. But when fully grown (adult), males also have an extended (longer) last segment.
Many species have more and even easier characteristics, by which you can distinguish the sexes
Additional small spike at the end of the males abdomen which you can see from the third or fourth instar (L3 or L4). (Idolomantis diabolica, Gongylus gongylodes, Blepharopsis mendica, Pseudocreobotra wahlbergii and others)
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