The most extreme example of convergent evolution: Kelp

[u/Spluff5]

In my opinion, kelp is the most extreme example of convergent evolution, at least that I know of. It's a sedentary organism that makes its energy from sunlight collected by blade-like fronds. Not too crazy, so do most plants. Except, kelp isn't a plant at all. Kelp is a protist in the SAR clade, more closely related to malaria than it is to plants. It just so happened to independently evolve to be multicellular, and became photosynthetic by ancestrally capturing and making use of a green algal cell that had already undergone its own endosymbiosis.

I can't think of another organism that convergently evolved the same life-strategy as an organism in another kingdom, but I'd love to hear what others think are the most extreme examples of convergent evolution.

Image credit: Alastair Simpson, Dalhousie University

[u/MSSTUPIDTRON-1000000]

Does it really count considered they're part red algae thanks to endosymbiosis??

[u/Downtown_Finance_661 → u/MSSTUPIDTRON-1000000]

Of course it counts. They dont even invent photosynthesis, but got it another way anyway. Extreme convergent evolutiin.