Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Gammaproteobacteria" nom. inval. see Class Gammaproteobacteria Garrity et al. 2005
       01 Order "Chromatiales" Garrity et al. 2001 nom. ined. see Order Chromatiales Imhoff 2005
       02 Order "Xanthomonadales" see Order Xanthomonadales Saddler and Bradbury 2005
       03 Order "Cardiobacteriales" nom. inval. see Order Cardiobacteriales Garrity et al. 2005
       04 Order "Thiotrichales" see Order Thiotrichales Garrity et al. 2005
       05 Order "Legionellales" Garrity and Holt 2001 nom. nud. see Order Legionellales Garrity et al. 2005
       06 Order "Methylococcales" nom. inval. see Order Methylococcales Bowman 2005
       08 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
       09 Order "Alteromonadales" Garrity et al. 2001 nom. ined. see Order Alteromonadales Bowman and McMeekin 2005
       10 Order "Vibrionales" Garrity & Holt, 2001
       11 Order "Aeromonadales" Garrity and Holt 2001 nom. nud. see Order Aeromonadales Martin-Carnahan and Joseph 2005
       12 Order "Enterobacteriales" Garrity and Holt 2001 nom. nud.
       13 Order "Pasteurellales" see Order Pasteurellales Garrity et al. 2005