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


The Hydrogenophilaceae are a family of Betaproteobacteria, with two genera. Like all Proteobacteria they are Gram-negative. Hydrogenophilus are thermophilic, growing around 50 °C and obtaining their energy from oxidizing hydrogen. It includes the genera Hydrogenophilus and Thiobacillus (see below for the removal of certain species).

Thiobacillus spp. can be used in pest control, such as potato scabs. If an affected area is treated with sulfur and Thiobacillus spp., the bacteria will oxidise the sulfur to sulfuric acid, which will destroy the pest, as the potato scabs cannot tolerate acidic conditions. Thiobacillus thioparus may contribute to the formation of acid rain through the oxidation of sulfur dioxide to sulfurous acid.

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 of ~3 km under the ice layer covering Lake Vostok in Antarctica.[1] The presence of this 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:[2]


  1. ^ 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. 
  2. ^ 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. PMID 10758854. Retrieved 19 December 2015.