Domain Bacteria Woese et al. 1990
   Phylum Thermodesulfobacteria Garrity and Holt 2001 see Phylum Deltaproteobacteria Kuever et al., 2006
     Class Thermodesulfobacteria Hatchikian et al. 2001 see Class Thermodesulfobacteria Hatchikian et al. 2002
       1 Order Thermodesulfobacteriales Hatchikian et al. 2001 see Order Thermodesulfobacteriales Hatchikian et al. 2002