Genus I Thermithiobacillus Kelly and Wood 2000 515VP Ann P Wood and Donovan P Kelly'lus. L. n. thermae warm baths; Gr. n. thios sulfur; n. Thermithiobacillus warmth-loving sulfur rodlet.

Gram-negative, nonsporeforming rods, 0.5 X 1-2 |m. Obligate aerobes, moderately thermophilic and obligately chemolitho-autotrophic on reduced inorganic sulfur compounds (thiosul-fate, polythionates, sulfur, and sulfide, but not thiocyanate); unable to oxidize ferrous iron. Contain ubiquinone Q-8. Other general characteristics are those of Thiobacillus. Member of the Gammaproteobacteria.

Type species: Thermithiobacillus tepidarius (Wood and Kelly 1985) Kelly and Wood 2000, 515 (Thiobacillus tepidarius Wood and Kelly 1985, 436.)

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