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