life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Status: extant
   Superkingdom Prokarya see Domain Bacteria Woese et al. 1990
  Status: extant
     Kingdom Bacteria (Cohn 1870) Cavalier-Smith 1983 - bacteria see Kingdom Bacteria Cavalier-Smith 2002
    Status: extant
       Subkingdom Eubacteria Cavalier-Smith 1981 see Domain Bacteria Woese et al. 1990
      Status: extant
         Division Gracilicutes Gibbons and Murray 1978 (Approved Lists 1980) see Phylum Gracilicutes
        Status: extant
           Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
          Status: extant
             "Gamma Group" see Class Gammaproteobacteria Garrity et al. 2005
            Status: extant
               1 "Enterics" see Class Gammaproteobacteria nom. inval.
              Status: extant
               2 Genus Azotobacter Beijerinck 1901 (Approved Lists 1980)
              Status: extant
               3 Genus Beggiatoa Trevisan 1842 (Approved Lists 1980)
              Status: extant
               4 Genus Chromatium Perty 1852 (Approved Lists 1980)
              Status: extant
               5 Genus Legionella Brenner et al. 1979 (Approved Lists 1980)
              Status: extant
               6 Genus Leucothrix Oersted 1844 (Approved Lists 1980)
              Status: extant
               8 Genus Thiocapsa Winogradsky 1888 (Approved Lists 1980)
              Status: extant
               9 Genus Thiospirillum Winogradsky 1888 (Approved Lists 1980)
              Status: extant