Domain Bacteria Woese et al. 1990
   Phylum Thermotogae Margulis and Schwartz 1998 - thermophilic fermenters see Phylum Thermotogae Reysenbach 2001
     Class Thermotogae Reysenbach 2001 see Class Thermotogae Reysenbach 2002
       1 Order Thermotogales Reysenbach 2001 see Order Thermotogales Reysenbach 2002