Genus XII Thioalkalicoccus Bryantseva Gorlenko Kompantseva and Imhoff 2000b 2161VP

Johannes F. Imhoff'' cus. Gr. n. thios sulfur; Arab n. al kali potash, soda; L. masc. n. coccus sphere; M.L.masc. n. Thioalkalicoccus sulfur sphere from soda.

Cells are spherical or oval, typically form diplococcus-shaped cells during cell division, multiply by binary fission, and are Gram negative. Internal membranes are of the tubular type. Photosynthetic pigments are bacteriochlorophyll b and carotenoids with absorption properties similar to tetrahydrospirilloxanthin. The metabolism is strictly anaerobic and obligately phototrophic. During photolithoautotrophic growth with sulfide as electron donor, globules of S0 are accumulated inside the cytoplasm. The final oxidation product is sulfate. In the presence of sulfide and bicarbonate, organic substrates are photoassimilated. Mesophilic, obligate alkaliphilic bacterium with optimum growth at 20-25°C. Optimal development is dependent on sodium salts in low concentrations and on alkaline conditions.

Habitat: Surface of sediments rich in organic matter, and mi-crobial mats of soda lakes containing hydrogen sulfide and exposed to the light.

Type species: Thioalkalicoccus limnaeus Bryantseva, Gorlenko, Kompantseva and Imhoff 2000b, 2162.

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