Hi Gregg, could you clarify that. I am under a different impression. Slugs are merely enlarged ovum, that were not fertilizied. (not an egg until fertilized and shelled or just shelled)
In that, slugs are about no healthy sperm reaching the ovum. Which can indeed be a result of the female, as you suggested, or the male, immobile sperm, weak, no sperm delivered during copulation. Males indeed can suffer from all of that. Or something as simple as non supportive chemistry in the oviducts, that does not allow the sperm to live long enough to fertilize the ovum.
With kings, I can explain how to tell which is which. Indeed, reproductive failure can fail in any of the steps to producing viable eggs. Thanks

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