Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Chromatiales Imhoff 2005
                     Family Chromatiaceae Bavendamm 1924 (Approved Lists 1980)
                       Genus Phaeobacterium Nupur et al. 2015
                       01 Genus Chromatiumᵀ Perty 1852 (Approved Lists 1980)
                       02 Genus Allochromatium Imhoff et al. 1998
                       03 Genus Halochromatium Imhoff et al. 1998
                       04 Genus Isochromatium Imhoff et al. 1998 [monotypic]
                       05 Genus Lamprobacter Gorlenko et al. 1988 [monotypic]
                       06 Genus Lamprocystis Schroeter 1886 (Approved Lists 1980)
                       07.1 Genus Marichromatium Imhoff et al. 1998
                       07.2 Genus Phaeochromatium Shivali et al. 2012 [monotypic]
                       08 Genus Nitrosococcus Winogradsky 1892 (Approved Lists 1980)
                       09 Genus Rhabdochromatium (ex Winogradsky 1888) Dilling et al. 1996 [monotypic]
                       10 Genus Rheinheimera Brettar et al. 2002
                       11 Genus Thermochromatium Imhoff et al. 1998 [monotypic]
                       12 Genus Thioalkalicoccus Bryantseva et al. 2000 [monotypic]
                       13 Genus Thiobaca Rees et al. 2002 [monotypic]
                       14 Genus Thiocapsa Winogradsky 1888 (Approved Lists 1980)
                       15 Genus Thiococcus (ex Eimhjellen et al. 1967) Imhoff et al. 1998 [monotypic]
                       16 Genus Thiocystis Winogradsky 1888 (Approved Lists 1980)
                       17 Genus Thiodictyon Winogradsky 1888 (Approved Lists 1980)
                       18 Genus Thioflavicoccus Imhoff and Pfennig 2001 [monotypic]
                       19 Genus Thiohalocapsa Imhoff et al. 1998 [monotypic]
                       20 Genus Thiolamprovum Guyoneaud et al. 1998 [monotypic]
                       21 Genus Thiopedia Winogradsky 1888 (Approved Lists 1980) [monotypic]
                       22 Genus Thiophaeococcus Anil Kumar et al. 2008 [monotypic]
                       23 Genus Thiorhodococcus Guyoneaud et al. 1998
                       24 Genus Thiorhodovibrio Overmann et al. 1993 [monotypic]
                       25 Genus Thiospirillum Winogradsky 1888 (Approved Lists 1980) [monotypic]