It turns out there is at least one eukaryote that does not have mitochondria! The oxymonad Monocercomonoides sp. I thought they were essential parts of eukaryote cells. This paper is from 2016, but I had never heard of this before.
https://www.cell.com/current-biology/fulltext/S0960-9822(16)30263-9
#oxymonad
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