Desulfobacterales are an order of sulfate-reducing bacteria within the phylum Thermodesulfobacteria.[1] The order contains three families; Desulfobacteraceae, Desulfobulbaceae, and Nitrospinaceae.[2] The bacterium in this order are strict anaerobic respirators, using sulfate or nitrate as the terminal electron acceptor instead of oxygen. Desulfobacterales can degrade ethanol, molecular hydrogen, organic acids, and small hydrocarbons.[3][4] The bacterium of this order have a wide ecological range and play important environmental roles in symbiotic relationships and nutrient cycling.