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Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Chromatiales
Family: Halothiobacillaceae
Genus: Halothiobacillus

Halothiobacillus halophilus
Halothiobacillus hydrothermalis
Halothiobacillus kellyi
Halothiobacillus neapolitanus

Halothiobacillus is a genus of Proteobacteria. All species are obligate aerobic bacteria; they require oxygen to grow. They are also halophilic; they live in environments with high concentrations of salt.

The members of this genus used to belong to Thiobacillus, before they were reclassified in the year 2000. They are now classified with the purple sulfur bacteria.


Kelly, D.P., and Wood, A.P. "Reclassification of some species of Thiobacillus to the newly designated genera Acidithiobacillus gen. nov., Halothiobacillus gen. nov. and Thermithiobacillus gen. nov." Int. J. Syst. Evol. Microbiol. (2000) 50:489-500.