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sexing roaches

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Does anyone know how to sex the following species?

N. cinerea

P. nivea

H. flexivatta

I have an idea on P. nivea I think... The males are overall smaller and the females are bulkier and slightly larger.

No idea on the other species though...

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Here it is demonstrated with Hissers. Not the same species but you get the idea.

Male: Picture

Female: Picture

Note that while the female's body ends with one, broad, large segment, the male's body ends with three.

Also, I know that H. flexivitta females are noticeably larger than males.

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