procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Epsilonproteobacteria" "Garrity and Holt 2001" nom. nud. [monotypic] see Class Epsilonproteobacteria Garrity et al. 2006
         Order "Campylobacterales" "Garrity and Holt 2001" nom. nud. see Order Campylobacterales Garrity et al. 2006
           Family Campylobacteraceae Vandamme and De Ley 1991
             1 Genus Campylobacter Sebald and Véron 1963 (Approved Lists 1980)
             2 Genus Arcobacter Vandamme et al. 1991
             3 Genus Sulfurospirillum Schumacher et al. 1993
             4 Genus Thiovulum Hinze 1913 (Approved Lists 1980)