Here, a reciprocal copulation between the sea slugs with both penile stylets (pst) inserted into the mating partners' foreheads (h); the penile bulbs (pb)…Read More »
are inserted in the mating partners' female genital openings hidden behind the right parapods (pa). The close-up photograph of a reciprocal copulation (c) shows the penile stylet of the left individual inserted into the forehead of the right individual. Less «
Not only do the slugs inject sperm into each other, they also stab each other in the head for several minutes after penetrating each other with their penile…Read More »
bulbs; they remain stabbed and pumping prostate fluid into each other's circulatory systems for the majority of their 40-minute mating period, researchers report on Nov. 12, 2013, in the journal Proceedings of the Royal Society B. Less «
The slug's penile stylet (arrow) penetrates its mate's outer membrane and injects prostate fluid into its circulatory system.
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