The Aquificaceae family are bacteria that live in harsh environmental settings such as hot springs, sulfur pools, and hydrothermal vents.

Although they are true bacteria as opposed to the other inhabitants of extreme environments, the Archaea, Aquificaceae genera are an early phylogenetic branch.

[1] The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[2] and National Center for Biotechnology Information (NCBI)[3] Hydrogenobaculum acidophilum (Shima & Suzuki 1993) Stohr et al. 2001 Aquifex pyrophilus Huber and Stetter 1992 (type sp.)

H. calditorris Nakagawa et al. 2004 (type sp.)

Hydrogenobaculum acidophilum Aquifex pyrophilus Hydrogenivirga calditorris Thermocrinis minervae H. hydrogenophilus H. thermophilus T. albus T. jamiesonii T. ruber Unassigned species: This bacteria-related article is a stub.