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By sexual reproduction I am referring to, at least, gametogenesis or mating bridges. I was previously under the impression that unicellular organisms did not reproduce sexually at all.

So far the sexually reproducing unicellular eukaryotes I am aware of are yeast, diatoms, malaria-causing Plasmodium and some diplomonads.

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This addresses your original question of "simplest" versus smallest. I'm not sure of sizes.

Investigate diplomonads: https://en.wikipedia.org/wiki/Diplomonad Most notable among them is Giardia: https://en.wikipedia.org/wiki/Giardia

These critters are primitive enough to lack Golgi and their version of "mitochondria" are substantially different enough (not synthesizing ATP) to be called by another name, mitosomes. Most have two nucleii and were not even thought to reproduce sexually until relatively recently

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