procaryotes
   Domain Bacteria Woese et al. 1990
     Phylum Thermotogae Reysenbach 2001
       Class Thermotogae Reysenbach 2001 nom. inval. see Class Thermotogae Reysenbach 2002
         1 Order Thermotogales Reysenbach 2001 nom. inval. see Order Thermotogales Reysenbach 2002