Procaryotic Genera Domain "Bacteria" Woese et al. 1990 Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005 Class "Epsilonproteobacteria" nom. inval. [monotypic] see Class Epsilonproteobacteria Garrity et al. 2006 Order "Campylobacterales" nom. inval. see Order Campylobacterales Garrity et al. 2006 1 Family Campylobacteraceae Vandamme and De Ley 1991 2 Family "Helicobacteraceae" nom. inval. see Family Helicobacteraceae Garrity et al. 2006