[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Epsilonproteobacteria Garrity et al. 2006
         Order Nautiliales Miroshnichenko et al. 2004
           Family Nautiliaceae Miroshnichenko et al. 2004
             Genus Nitratifractor Nakagawa et al. 2005
               1 Nitratifractor salsuginis Nakagawa et al. 2005