Procaryotic Genera
   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 Acidithiobacillales Garrity et al. 2001 nom. ined. see Order Acidithiobacillales Garrity et al. 2005
         03 Order "Xanthomonadales" [monotypic] see Order Xanthomonadales Saddler and Bradbury 2005
         04 Order "Cardiobacteriales" nom. inval. [monotypic] see Order Cardiobacteriales Garrity et al. 2005
         05 Order "Thiotrichales" see Order Thiotrichales Garrity et al. 2005
         06 Order "Legionellales" Garrity and Holt 2001 nom. nud. see Order Legionellales Garrity et al. 2005
         07 Order "Methylococcales" nom. inval. [monotypic] see Order Methylococcales Bowman 2005
         08 Order "Oceanspirillales" see Order Oceanospirillales Garrity et al. 2005
         09 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
         10 Order "Alteromonadales" Garrity et al. 2001 nom. ined. [monotypic] see Order Alteromonadales Bowman and McMeekin 2005
         11 Order "Vibrionales" Garrity & Holt, 2001 [monotypic]
         12 Order "Aeromonadales" Garrity and Holt 2001 nom. nud. see Order Aeromonadales Martin-Carnahan and Joseph 2005
         13 Order "Enterobacteriales" Garrity and Holt 2001 nom. nud. [monotypic]
         14 Order "Pasteurellales" [monotypic] see Order Pasteurellales Garrity et al. 2005