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jigokutamago said:

Species that I've not seen
https://en.wikipedia.org/wiki/Adactylidium

Wow.

Speaking of weird repoductive cycles:
https://en.wikipedia.org/wiki/Anglerfish#Reproduction

Basically the males are tiny compared to the females, and they just swim around till they find a female, then latch on and are absorbed into the female becoming essentially a sperm switch for her to use when it's time to fertilise.