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What you should know:

Desulfovibrio are Gram - negative anaerobic straight or curved rods. They are chemoheterotrophs which reduce sulfur to H2S gas during anaerobic respiration. Hydrogen sulfide produced by these anaerobes often precipitates in iron-rich waters or soils, causing a black color (Desulfovibrio are responsible for the color of the Black Sea). These are very common in waterlogged soils and mud flats.


Domain Bacteria

    Phylum Proteobacteria

        Class d - Proteobacteria

Bergey's Manual Volume 2: The Proteobacteria