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A gonopore, sometimes called a gonadopore, is a genital pore in many . Hexapoda, including , have a single common gonopore, except mayfly, which have a pair of gonopores. More specifically, in the unmodified female, it is the opening of the common oviduct, and in the male, it is the opening of the ejaculatory duct.
The position of the gonopore varies considerably between groups, but is generally constant within groups, allowing its position to be used as a "segmental marker". In Malacostraca, it is on the sixth thoracic segment; in Symphyla, it is on the fourth trunk segment; in , it is on the second segment of the opisthosoma.Alessandro Minelli, Giuseppe Risco & Nigel Hughes (2025). 9780901702814, Wiley-Blackwell. ISBN 9780901702814 In and , the gonopores are close to the animal's tail, while in , they are on the third body segment behind the head, near the second pair of legs. (1992). 9780198576990, Oxford University Press. ISBN 9780198576990
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