Archaeoglobus
Ferroglobus The Archaeoglobi are a family of Archaea, with two genera. Both are hyperthermophiles, found in undersea hydrothermal vents.

Ferroglobus is chemoautotrophic, oxidizing iron salts from Fe²⁺ to Fe³⁺, and at the same time reducing nitrate to nitrite.

Archaeoglobus is unique among the Archaea in using sulfate as its oxidizing agent, although there are various sulfate-reducing bacteria that do the same.