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]
               Phylum "Candidatus Freyrarchaeota" Xie et al. 2023, incertae sedis [monotypic]
                 1 Class "Candidatus Freyrarchaeia"ᵀ Xie et al. 2022 nom. pro-inval. [monotypic]