obligately phototrophic and strictly anaerobic. Photolithoautotrophic growth under an conditions in the light with sulfide and so as electron donors. During oxidation of sulfide, S transiently stored inside the cells in the form of highly refractile globules. Sulfate is the final oxidation product. Storage materials are polysaccharides, poly-l-hydroxybutyrate, S0, and polyphosphate