I would insist the father be nothing but a sperm donor.
Sperm sacs generally occupying a good many segments and with simple interior undivided by a network of trabeculae.
Spermatheca or receptacle of the sperm in copulation, opening into the female duct.
Sperm ducts traverse several segments on their way to exterior.
There is no possibility that sperm and ova can escape by these tubes not in company with coelomic fluid.
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