Genus XVII Thioflavicoccus Imhoff and Pfennig 2001 109VP Johannes F Imhoff'vi.coc'cus. Gr. n. thios sulfur; L. masc. adj. flavus golden-yellow, beige; L. masc. n. coccus sphere; M.L. masc. n. Thioflavicoccus beige-yellow coccus with sulfur.

Cells are spherical with diplococcus-shaped division stages, motile by flagella, multiply by binary fission. Gram negative; belong to the Gammaproteobacteria. Contain internal photosynthetic membranes of tubular shape. Photosynthetic pigments are bac-teriochlorophyll b and carotenoids.

Obligately phototrophic and strictly anaerobic. Photolithoau-totrophic growth under anoxic conditions in the light with sulfide and elemental sulfur as electron donors. During oxidation of sulfide, elemental sulfur transiently stored inside the cells in the form of highly refractile globules. Final oxidation product is sulfate. In the presence of sulfide and bicarbonate, simple organic substrates photoassimilated.

Mesophilic bacteria growing well at 20-30°C and neutral pH (pH range 6.5-7.5) and requiring sodium chloride for optimum growth.

Type species: Thioflavicoccus mobilis Imhoff and Pfennig 2001, 109.

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