[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 Gammaproteobacteria Garrity et al. 2005
         01 Order Chromatiales Imhoff 2005
         02 Order Acidithiobacillales Garrity et al. 2005
         03 Order Xanthomonadales Saddler and Bradbury 2005 nom. illeg. see Order Lysobacterales Christensen and Cook 1978 (Approved Lists 1980)
         04 Order Cardiobacteriales Garrity et al. 2005
         05 Order Thiotrichales Garrity et al. 2005 nom. illeg. see Order Beggiatoales Buchanan 1957 (Approved Lists 1980)
         06 Order Legionellales Garrity et al. 2005
         07 Order Methylococcales Bowman 2005
         08 Order Oceanospirillales Garrity et al. 2005
         09 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
         10 Order Alteromonadales Bowman and McMeekin 2005
         11 Order "Vibrionales" "Garrity and Holt 2001" nom. nud.
         12 Order Aeromonadales Martin-Carnahan and Joseph 2005
         13 Order "Enterobacteriales" "Garrity and Holt 2001" nom. nud. see Order Enterobacterales Adeolu et al. 2016
         14 Order Pasteurellales Garrity et al. 2005
         15 Order "Salinisphaerales" "Garrity et al. 2007" nom. nud. see Order Nevskiales Naushad et al. 2015