Evolutionary biology: Essence of mitochondria

@article{Henze2003EvolutionaryBE,
  title={Evolutionary biology: Essence of mitochondria},
  author={Katrin Henze and William F. Martin},
  journal={Nature},
  year={2003},
  volume={426},
  pages={127-128}
}
For years, a unicellular creature called Giardia has occupied a special place in biology because it was thought to lack mitochondria. But it does have them — though tiny, they pack a surprising anaerobic punch. 
Is Giardia a living fossil?
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TLDR
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