[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
           1 Family Chromatiaceae Bavendamm 1924 (Approved Lists 1980)
           2 Family Ectothiorhodospiraceae Imhoff 1984
           3 Family Halothiobacillaceae Kelly and Wood 2005