[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Crenarchaeota" Garrity and Holt 2001
       Class Thermoprotei Reysenbach 2002
         Order Desulfurococcales Huber and Stetter 2002
           Family Pyrodictiaceae Burggraf et al. 1997
             1 Genus Pyrodictium Stetter et al. 1984
             2 Genus Hyperthermus Zillig et al. 1991
             3 Genus Pyrolobus Blöchl et al. 1999