[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota
     Kingdom Bacteria Cavalier-Smith 2002 - bacteria see Domain Bacteria Woese et al. 1990
       Subkingdom Negibacteria Cavalier-Smith 2002 - negibacteria see Domain Bacteria Woese et al. 1990
         Phylum Proteobacteria Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
           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.
             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 see Order Nevskiales Naushad et al. 2015
             15 Order Thiotrichales Garrity et al. 2005
             16 Order "Vibrionales" Garrity & Holt, 2001
             17 Order Xanthomonadales Saddler and Bradbury 2005 see Order Lysobacterales Christensen and Cook 1978 (Approved Lists 1980)