prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Thermotogae" Reysenbach 2002 stat. inval. [monotypic] see Phylum Thermotogota Reysenbach 2021
       Class Thermotogae Reysenbach 2002
         Order Thermotogales Reysenbach 2002 [monotypic]
           Family Thermotogaceae Reysenbach 2002
             1 Genus Fervidobacterium Patel et al. 1985
             2 Genus Thermococcoides Feng et al. 2010 see Genus Kosmotoga DiPippo et al. 2009
             3 Genus Thermosipho Huber et al. 1989
             4 Genus Thermotoga Stetter and Huber 1986