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 "Gammaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Gammaproteobacteria Garrity et al. 2005
         01 Order "Chromatiales" "Garrity and Holt 2001" nom. nud. see Order Chromatiales Imhoff 2005
         02 Order "Xanthomonadales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Xanthomonadales Saddler and Bradbury 2005 nom. illeg.
         03 Order "Cardiobacteriales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Cardiobacteriales Garrity et al. 2005
         04 Order "Thiotrichales" "Garrity and Holt 2001" nom. nud. see Order Thiotrichales Garrity et al. 2005 nom. illeg.
         05 Order "Legionellales" "Garrity and Holt 2001" nom. nud. see Order Legionellales Garrity et al. 2005
         06 Order "Methylococcales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Methylococcales Bowman 2005
         07 Order "Oceanospirillales" "Garrity and Holt 2001" nom. nud. see Order Oceanospirillales Garrity et al. 2005
         08 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
         09 Order "Alteromonadales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Alteromonadales Bowman and McMeekin 2005
         10 Order "Vibrionales" "Garrity and Holt 2001" nom. nud. [monotypic]
         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. [monotypic] see Order Enterobacterales Adeolu et al. 2016
         13 Order "Pasteurellales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Pasteurellales Garrity et al. 2005