prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class Thermococci Zillig and Reysenbach 2002 [monotypic]
         Order Thermococcales Zillig 1988 [monotypic]
           Family Thermococcaceae Zillig 1988
             Genus Thermococcus Zillig 1983