[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria Garrity et al. 2005
         Order Chromatiales Imhoff 2005
           Family Ectothiorhodospiraceae Imhoff 1984
             01 Genus Ectothiorhodospira Pelsh 1936 (Approved Lists 1980)
             02 Genus Alkalilimnicola corrig. Yakimov et al. 2001
             03 Genus Alkalispirillum Rijkenberg et al. 2002 nom. inval. see Genus Alkalispirillum Rijkenberg et al. 2025
             04 Genus Arhodomonas Adkins et al. 1993
             05 Genus Halorhodospira Imhoff and Süling 1997
             06 Genus Methylothermus Tsubota et al. 2005 nom. inval.
             07 Genus Nitrococcus Watson and Waterbury 1971 (Approved Lists 1980)
             08 Genus Thioalkalispira Sorokin et al. 2002
             09 Genus Thioalkalivibrio Sorokin et al. 2001
             09.0 Genus "Thialkalivibrio" "corrig." Sorokin et al. 2001 see Genus Thioalkalivibrio Sorokin et al. 2001
             10 Genus Thiorhodospira Bryantseva et al. 1999