prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       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
             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