procaryotes
   Domain Archaea Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum Crenarchaeota Garrity and Holt 2002 stat. inval. see Phylum Thermoproteota Garrity and Holt 2021
       Class Thermoprotei Reysenbach 2001 nom. inval. see Class Thermoprotei Reysenbach 2002
         Order Desulfurococcales Huber and Stetter 2001 nom. inval. see Order Desulfurococcales Huber and Stetter 2002
           Family Pyrodictiaceae Burggraf et al. 1997
             Genus Hyperthermus Zillig et al. 1991