Proto-mitochondrion

Proto-mitochondrion
Scientific classification
Domain:
Phylum:
Class:
Alphaproteobacteria (or sister to)
Order:

The proto-mitochondrion is the hypothetical ancestral bacterial endosymbiont from which all mitochondria in eukaryotes are thought to descend, after an episode of symbiogenesis which created the aerobic eukaryotes.