Handlewithcare
Versed in the lewd.
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All of those examples are single cells. This sort of tight integration usually happens very early in a species' evolutionary history. You wouldn't get tightly integrated symbiosis at a macroscopic scale normally in evolution, because by the time you'd get to large multicellular life, they'd already be too specialized to autonomy to integrate cleanly.
https://en.wikipedia.org/wiki/Portuguese_man_o'_war
Though the parts of this one are all the same species I think.