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
                   Order "Candidatus Geothermarchaeales" Adam et al. 2022 nom. pro-inval.
                     Family "Candidatus Geothermarchaeaceae"ᵀ Adam et al. 2022 nom. pro-inval. [monotypic]
                       1 Genus "Candidatus Geothermarchaeum"ᵀ Adam et al. 2022 nom. pro-inval.