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
                       1 Genus "Caldococcus" Svetlichny et al. 1987 nom. inval.
                       2 Family Desulfurococcaceaeᵀ Zillig and Stetter 1983
                       3 Family Pyrodictiaceae Burggraf et al. 1997