prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   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 Order "Enterobacteriales" Garrity and Holt 2001 nom. nud. [monotypic]
         02 Order "Vibrionales" Garrity & Holt, 2001 [monotypic]
         03 Order Acidiferrobacterales Kojima et al. 2015 [monotypic]
         04 Order Acidithiobacillales Garrity et al. 2005
         05 Order Aeromonadales Martin-Carnahan and Joseph 2005
         06 Order Alteromonadales Bowman and McMeekin 2005
         07 Order Arenicellales Teramoto et al. 2015 [monotypic]
         08 Order Cardiobacteriales Garrity et al. 2005 [monotypic]
         09 Order Cellvibrionales Spring et al. 2015
         10 Order Chromatiales Imhoff 2005
         11 Order Legionellales Garrity et al. 2005
         12 Order Lysobacterales Christensen and Cook 1978 (Approved Lists 1980)
         13 Order Methylococcales Bowman 2005
         14 Order Nevskiales Naushad et al. 2015
         15 Order Oceanospirillales Garrity et al. 2005
         16 Order Orbales Kwong and Moran 2013 [monotypic]
         17 Order Pasteurellales Garrity et al. 2005 [monotypic]
         18 Order Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980)
         19 Order Thiotrichales Garrity et al. 2005
         20 Genus Alkalimarinus Zhao et al. 2015, incertae sedis
         21 Genus Alkalimonas Ma et al. 2007, incertae sedis
         22 Genus Arenicella Romanenko et al. 2010, incertae sedis
         23 Genus Gallaecimonas Rodríguez-Blanco et al. 2010, incertae sedis
         24 Genus Ignatzschineria Tóth et al. 2007, incertae sedis
         25 Genus Litorivivens Park et al. 2015, incertae sedis
         26 Genus Marinicella Romanenko et al. 2010, incertae sedis
         27 Genus Methylohalomonas Sorokin et al. 2007, incertae sedis
         28 Genus Methylonatrum Sorokin et al. 2007, incertae sedis
         29 Genus Plasticicumulans Jiang et al. 2011, incertae sedis
         30 Genus Pseudohongiella Wang et al. 2015, incertae sedis
         31 Genus Sedimenticola Narasingarao and Häggblom 2006, incertae sedis
         32 Genus Thiohalobacter Sorokin et al. 2010, incertae sedis
         33 Genus Thiohalomonas Sorokin et al. 2007, incertae sedis
         34 Genus Thiohalorhabdus Sorokin et al. 2008, incertae sedis
         35 Genus Thiolapillus Nunoura et al. 2015, incertae sedis
         36 Genus Wohlfahrtiimonas Tóth et al. 2008, incertae sedis