procaryotes
   Domain Archaea Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum Crenarchaeota Garrity and Holt 2001 [monotypic]
       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
           1 Family Desulfurococcaceae Zillig and Stetter 1983
           2 Family Pyrodictiaceae Burggraf et al. 1997