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
                     Order Nitrosopumilales Qin et al. 2017
                       Family Nitrosopumilaceaeᵀ Qin et al. 2017
                         1 Genus "Candidatus Cenarchaeum" DeLong and Preston 2020
                         2 Genus "Candidatus Nitrosokoinonia" Glasl et al. 2024 nom. pro-inval.
                         3 Genus "Candidatus Nitrosomarinus" Ahlgren et al. 2020
                         4 Genus "Candidatus Nitrosomaritimum" Zhao et al. 2024 nom. pro-inval.
                         5 Genus "Candidatus Nitrosospongia" Moeller et al. 2021
                         6 Genus Nitrosarchaeum Jung et al. 2018
                         7 Genus Nitrosopumilusᵀ Qin et al. 2017