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]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Epsilonproteobacteria Garrity et al. 2006
                   Order Nautiliales Miroshnichenko et al. 2004 [monotypic]
                     Family Nautiliaceaeᵀ Miroshnichenko et al. 2004
                       Genus Nitratifractor Nakagawa et al. 2005 [monotypic]
                         Nitratifractor salsuginisᵀ Nakagawa et al. 2005