[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota Margulis 1974 nom. nud.
     Kingdom Bacteria Cavalier-Smith 2002 stat. inval. - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
       Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval. - negibacteria see Domain Bacteria Woese et al. 1990 stat. inval.
         Phylum Proteobacteria Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
           Class Gammaproteobacteria Garrity et al. 2005
             01 Genus Alkalimonas Ma et al. 2007
             02 Order Acidithiobacillales Garrity et al. 2005
             03 Order Aeromonadales Martin-Carnahan and Joseph 2005
             04 Order Alteromonadales Bowman and McMeekin 2005
             05 Order Cardiobacteriales Garrity et al. 2005
             06 Order Chromatiales Imhoff 2005
             07 Order "Enterobacteriales" "Garrity and Holt 2001" nom. nud. see Order Enterobacterales Adeolu et al. 2016
             08 Order Legionellales Garrity et al. 2005
             09 Order Methylococcales Bowman 2005
             10 Order Oceanospirillales Garrity et al. 2005
             11 Order Orbales Kwong and Moran 2013
             12 Order Pasteurellales Garrity et al. 2005
             13 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
             14 Order "Salinisphaerales" "Garrity et al. 2007" nom. nud. see Order Nevskiales Naushad et al. 2015
             15 Order Thiotrichales Garrity et al. 2005 nom. illeg. see Order Beggiatoales Buchanan 1957 (Approved Lists 1980)
             16 Order "Vibrionales" "Garrity and Holt 2001" nom. nud.
             17 Order Xanthomonadales Saddler and Bradbury 2005 nom. illeg. see Order Lysobacterales Christensen and Cook 1978 (Approved Lists 1980)