Procaryotic Genera
   Domain "Archaea" Woese et al. 1990
     Phylum Euryarchaeota Garrity and Holt 2001
       Class Thermococci Zillig and Reysenbach 2001 nom. inval. [monotypic] see Class Thermococci Zillig and Reysenbach 2002
         1 Order Thermococcalesᵀ Zillig 1988 [monotypic]