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Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Hydrogenophilalia
Order: Hydrogenophilales
Family: Hydrogenophilaceae


The Hydrogenophilaceae are a family of the Hydrogenophilalia, with two genera – Hydrogenophilus and Tepidiphilus]]. Like all Proteobacteria, they are Gram-negative. All species are thermophilic, growing around 50°C and obtaining their energy from oxidizing hydrogen or organic molecules.

Thiobacillus spp. were previously found in this family but were reclassified into the order Nitrosomonadales at the same time that the Hydrogenophilales was removed from the Betaproteobacteria and a new class Hydrogenophilalia was formed.[1]

Hydrogenophilus thermoluteolus is a facultative chemolithoautotroph that previously had only been found in hot springs. However, it was isolated in 2004 from ice core samples retrieved from a depth around 3 km under the ice layer covering Lake Vostok in Antarctica.[2] The presence of these thermophilic bacteria in the ice suggests that a geothermal system exists beneath the cold water body of Lake Vostok.

Obsolete Thiobacillus species[edit]

The genus Thiobacillus was redefined to include only those species included among the Betaproteobacteria. Other member organisms once named "Thiobacillus" were transferred to Gammaproteobacteria:[3]


  1. ^ Boden, Hutt and Rae (2017) Reclassification of Thiobacillus aquaesulis (Wood & Kelly, 1995) as Annwoodia aquaesulis gen. nov., comb. nov., transfer of Thiobacillus (Beijerinck, 1904) from the Hydrogenophilales to the Nitrosomonadales, proposal of Hydrogenophilalia class. nov. within the 'Proteobacteria', and four new families within the orders Nitrosomonadales and Rhodocyclales. Int J Syst Evol Microbiol 67: 1191-1205
  2. ^ Sergey A. Bulat; Irina A. Alekhina; Michel Blot; Jean-Robert Petit; Martine de Angelis; Dietmar Wagenbach; Vladimir Ya. Lipenkov; Lada P. Vasilyeva; Dominika M. Wloch; Dominique Raynaud; Valery V. Lukin (August 2004). "DNA signature of thermophilic bacteria from the aged accretion ice of Lake Vostok, Antarctica: implications for searching for life in extreme icy environments". International Journal of Astrobiology. 3: 1–12. doi:10.1017/S1473550404001879. Retrieved 2011-01-29. 
  3. ^ Kelly DP; Wood AP (2000). "Reclassification of some species of Thiobacillus to the newly designated genera Acidithiobacillus gen. nov., Halothiobacillus gen. nov. and Thermithiobacillus gen. nov". International Journal of Systematic and Evolutionary Microbiology. 50: 511–516. doi:10.1099/00207713-50-2-511. PMID 10758854. Retrieved 19 December 2015.