Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Chromatiales Imhoff 2005
                     Family Chromatiaceaeᵀ Bavendamm 1924 (Approved Lists 1980)
                       01 Genus Alishewanella Fonnesbech Vogel et al. 2000
                       02 Genus Allochromatium Imhoff et al. 1998
                       03 Genus Caldichromatium Saini et al. 2020
                       04 Genus Chromatiumᵀ Perty 1852 (Approved Lists 1980)
                       05 Genus Halochromatium Imhoff et al. 1998
                       06 Genus Imhoffiella Nupur et al. 2017
                       07 Genus Isochromatium Imhoff et al. 1998 [monotypic]
                       08 Genus Lamprobacter Gorlenko et al. 1988 [monotypic]
                       09 Genus Lamprocystis Schroeter 1886 (Approved Lists 1980)
                       10 Genus Marichromatium Imhoff et al. 1998
                       11 Genus Nitrosococcus Winogradsky 1892 nom. cons. (Approved Lists 1980)
                       12 Genus Phaeobacterium Nupur et al. 2015
                       13 Genus Phaeochromatium Shivali et al. 2012 [monotypic]
                       14 Genus Rhabdochromatium (ex Winogradsky 1888) Dilling et al. 1996 [monotypic]
                       15 Genus Rheinheimera Brettar et al. 2002
                       16 Genus Thermochromatium Imhoff et al. 1998 [monotypic]
                       17 Genus Thioalkalicoccus Bryantseva et al. 2000 [monotypic]
                       18 Genus Thiobaca Rees et al. 2002 [monotypic]
                       19 Genus Thiocapsa Winogradsky 1888 (Approved Lists 1980)
                       20 Genus Thiococcus (ex Eimhjellen et al. 1967) Imhoff et al. 1998 [monotypic]
                       21 Genus Thiocystis Winogradsky 1888 (Approved Lists 1980)
                       22 Genus Thiodictyon Winogradsky 1888 (Approved Lists 1980)
                       23 Genus Thiohalocapsa Imhoff et al. 1998 [monotypic]
                       24 Genus Thiolamprovum Guyoneaud et al. 1998 [monotypic]
                       25 Genus Thiopedia Winogradsky 1888 (Approved Lists 1980) [monotypic]
                       26 Genus Thiophaeococcus Anil Kumar et al. 2008 [monotypic]
                       27 Genus Thiorhodococcus Guyoneaud et al. 1998
                       28 Genus Thiorhodovibrio Overmann et al. 1993 [monotypic]
                       29 Genus Thiospirillum Winogradsky 1888 (Approved Lists 1980) [monotypic]
                       30 Genus "Thioflavicoccus" Imhoff and Pfennig 2001 nom. inval. [monotypic]
                       31 Genus "Candidatus Nitrosacidicoccus" corrig. Picone et al. 2022
                       32 Genus "Candidatus Nitrosoglobus" Hayatsu et al. 2020
                       33 Genus "Candidatus Tenderia" Eddie et al. 2016
                       34 Genus "Candidatus Thioaporhodococcus" Amulyasai et al. 2022 nom. pro-inval.