[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 Campylobacterales Garrity et al. 2006
           1 Family Campylobacteraceae Vandamme and De Ley 1991
           2 Family Helicobacteraceae Garrity et al. 2006
           3 Family "Hydrogenimonaceae" (sic) Garrity et al. 2004 nom. nud. see Family Hydrogenimonadaceae corrig. Garrity et al. 2004 nom. nud.