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The Hydrogenothermaceaefamily are bacteria that live in harsh environmental settings. They have been found in hot springs, sulfur pools, and thermal ocean vents. They are true bacteria as opposed to the other inhabitants of extreme environments, the Archaea. An example occurrence of certain extremophiles in this family are organisms of the genus Sulfurihydrogenibium that are capable of surviving in extremely hot environments such as Hverigerdi, Iceland.
Obtaining energy
Hydrogenothermaceae families consist of aerobic or microaerophilic bacteria, which generally obtain energy by oxidation of hydrogen or reduced sulfur compounds by molecular oxygen.
C.Michael Hogan eds. E.Monosson and C.Cleveland (2010). "Extremophile". Encyclopedia of Earth. National Council for Science and the Environment, Washington DC. Retrieved 2011-06-11.
Hedlund, Brian P., et al. “Isolation of Diverse Members of the Aquificales from Geothermal Springs in Tengchong, China.” Frontiers in Microbiology, vol. 6, 2015, doi:10.3389/fmicb.2015.00157.