Donovan P. Kelly and Ann P Wood'lus. Gr. n. hals sea, salt; Gr. n. thios sulfur; L. n. bacillus asmall rod; L. masc. n. Thiobacillus salt-loving sulfur rodlet.

Obligately chemolithoautotrophic Gram-negative rods, 0.3-0.6 X 1.0-2.5 |im, occurring singly or in pairs. Energy for growth is obtained from the oxidation of reduced inorganic sulfur compounds (thiosulfate, tetrathionate, trithionate, sulfur, and sulfide, but not thiocyanate); unable to oxidize ferrous iron. Tolerant of high concentrations of solutes (e.g., 4 M NaCl; 0.25 M sodium thiosulfate), with some strains showing moderate halophily with a requirement for NaCl (optima 0.4-1.0 M NaCl). Optimum temperature for growth 30-42°C and optimum pH 6.5-8.0. During growth on reduced sulfur compounds, pH is changed from neutrality to pH 2.5-3.0. Contain ubiquinone Q-8. Member of the Gammaproteobacteria.

Type species: Halothiobacillus neapolitanus (Parker 1957) Kelly and Wood 2000, 515 (Thiobacillus neapolitanus Parker 1957, 86.)

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