The flatworms “fence” using extendable two-headed dagger-like stylets. These stylets are pointed (and in some species hooked) in order to pierce their mate’s epidermis…
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P. bedfordi is exceptional in that it applies sperm onto the partner’s skin rather than injecting it
Exceptional, hu?
fun fact injecting is called traumatic insemination, usually exclusive to parasitic organisms that mate like bed bugs, sea louses, and other insects.
earthworm, slugs does something similar.
