How does one determine the sex of soft ticks (Argasidae)?

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Ndudim Isaac Ogo

Sexual dimorphism is not obvious/marked in soft ticks. However, the sexes are differentiated only by the size of the genital aperture/opening located anteriorly on the ventral surface of the ticks. The aperture is thought to be larger in the female.

Thies H. Büscher

Also, the shape of the genital aperture should be informative in most cases. The opening in males is ~semilunar shaped (and therefore apparently smaller) due to a cuticular protrusion posteriously, while that of the females is oval.