Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 2024 [paraphyletic]
               Kingdom Thermoproteati Guy and Ettema 2024
                 Phylum Thermoproteotaᵀ Garrity and Holt 2021
                   Class Thermoproteiᵀ Reysenbach 2002
                     Order Desulfurococcales Huber and Stetter 2002
                       Family Desulfurococcaceaeᵀ Zillig and Stetter 1983
                         1 Genus Desulfurococcusᵀ Zillig and Stetter 1983
                         2 Genus Ignicoccus Huber et al. 2000
                         3 Genus Ignisphaera Niederberger et al. 2006 [monotypic]
                         4 Genus Staphylothermus Stetter and Fiala 1986
                         5 Genus Sulfophobococcus Hensel et al. 1997 [monotypic]
                         6 Genus Thermogladius Kochetkova et al. 2016
                         7 Genus Thermosphaera Huber et al. 1998 [monotypic]
                         8 Genus "Zestomicrobium" Dzhuraeva et al. 2024 nom. inval.
                         9 Genus Zestosphaera St. John et al. 2021