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 Nitrososphaeria Stieglmeier et al. 2014
                     1 Order "Candidatus Caldarchaeales" Rinke et al. 2021 nom. pro-inval.
                     2 Order "Candidatus Methylarchaeales" Ou et al. 2022 nom. pro-inval. [monotypic]
                     3 Order "Candidatus Nitrosomirales" Zheng et al. 2024 nom. pro-inval. [monotypic]
                     4 Order Conexivisphaerales Kato et al. 2021 [monotypic]
                     5 Order Nitrosopumilales Qin et al. 2017
                     6 Order Nitrososphaeralesᵀ Stieglmeier et al. 2014
                     7 Order Nitrosotaleales Lehtovirta-Morley et al. 2024 [monotypic]