prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   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 [monotypic]
           Family Nautiliaceae Miroshnichenko et al. 2004
             1 Genus Caminibacter Alain et al. 2002
             2 Genus Cetia Grosche et al. 2015 see Genus Caminibacter Alain et al. 2002
             3 Genus Lebetimonas Takai et al. 2005
             4 Genus Nautilia Miroshnichenko et al. 2002
             5 Genus Nitratifractor Nakagawa et al. 2005
             6 Genus Nitratiruptor Nakagawa et al. 2005
             7 Genus Thioreductor Nakagawa et al. 2005