genital opening

From ZooTerms (Dictionary of Invertebrate Zoology)
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genital opening: 1. (Arthropoda: Chelicerata) a. In Acari, originally a transverse slit or trifid orifice associated with segment eight. b. In many actinotrochid Acari, it is found in the progenital chamber where it is named the eugenital opening.

2. (Mollusca: Bivalvia) Opening for gonadal products leading into the cloacal passage.