[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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
         Order Chromatiales Imhoff 2005
           Family Chromatiaceae Bavendamm 1924 (Approved Lists 1980)
             01 Genus Chromatium 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
             05 Genus Lamprobacter Gorlenko et al. 1988
             06 Genus Lamprocystis Schroeter 1886 (Approved Lists 1980)
             06.0 Genus Pfennigia Tindall 1999 see Genus Lamprocystis Schroeter 1886 (Approved Lists 1980)
             07 Genus Marichromatium Imhoff et al. 1998
             08 Genus Nitrosococcus Winogradsky 1892 (Approved Lists 1980)
             09 Genus Rhabdochromatium (ex Winogradsky 1888) Dilling et al. 1996
             10 Genus Rheinheimera Brettar et al. 2002
             11 Genus Thermochromatium Imhoff et al. 1998
             12 Genus Thioalkalicoccus Bryantseva et al. 2000
             13 Genus Thiobaca Rees et al. 2002
             14 Genus Thiocapsa Winogradsky 1888 (Approved Lists 1980)
             14.0 Genus Amoebobacter Winogradsky 1888 (Approved Lists 1980) see Genus Thiocapsa Winogradsky 1888 (Approved Lists 1980)
             15 Genus Thiococcus (ex Eimhjellen et al. 1967) Imhoff et al. 1998
             16 Genus Thiocystis Winogradsky 1888 (Approved Lists 1980)
             17 Genus Thiodictyon Winogradsky 1888 (Approved Lists 1980)
             18 Genus Thioflavicoccus Imhoff and Pfennig 2001
             19 Genus Thiohalocapsa Imhoff et al. 1998
             20 Genus Thiolamprovum Guyoneaud et al. 1998
             21 Genus Thiopedia Winogradsky 1888 (Approved Lists 1980)
             22 Genus Thiorhodococcus Guyoneaud et al. 1998
             23 Genus Thiorhodovibrio Overmann et al. 1993
             24 Genus Thiospirillum Winogradsky 1888 (Approved Lists 1980)