There are no known eukaryotes which never had mitochondria
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There are no known eukaryotes which never had mitochondria by
Ciro Santilli 32 Updated 2024-09-07 Created 1970-01-01
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As of 2020, there are no known eukaryotes which have never had mitochondria.
Known eukaryotes without mitochondria, which are very rare, have lost mitochondria they previously had.
Having mitochondria appears to be a requisite for being an eukaryote. This is one of the central thesis of Power, Sex, Suicide by Nick Lane (2006).