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.