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Description of ChromatiumGram-negative, ovoid to rod-shaped bacteria, phototrophic, use ammonia as a nitrogen source. Some are found only in sulfide-containing freshwater habitats exposed to light while others may occur in marine, estuarine, and freshwater environments. Motile by means of polar flagella. Described by PERTY, 1852. Zur Kenntnis kleinster Lebensformen. Jent and Reinert, Bern I-VIII, 1-228.