prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Betaproteobacteria Garrity et al. 2006
         Order Rhodocyclales Garrity et al. 2006 [monotypic]
           Family Rhodocyclaceae Garrity et al. 2006
             01 Genus Azoarcus Reinhold-Hurek et al. 1993
             02 Genus Azonexus Reinhold-Hurek and Hurek 2000
             03 Genus Azospira Reinhold-Hurek and Hurek 2000
             04 Genus Azovibrio Reinhold-Hurek and Hurek 2000
             05 Genus Dechloromonas Achenbach et al. 2001
             06 Genus Dechlorosoma Achenbach et al. 2001 see Genus Azospira Reinhold-Hurek and Hurek 2000
             07 Genus Denitratisoma Fahrbach et al. 2006
             08 Genus Ferribacterium Cummings et al. 2000
             09 Genus Georgfuchsia Weelink et al. 2011
             10 Genus Methyloversatilis Kalyuzhnaya et al. 2006
             11 Genus Propionibacter Meijer et al. 1999 see Genus Propionivibrio Tanaka et al. 1991
             12 Genus Propionivibrio Tanaka et al. 1991
             13 Genus Quatrionicoccus Tindall and Euzéby 2006
             14 Genus Rhodocyclus Pfennig 1978 (Approved Lists 1980)
             15 Genus Sterolibacterium Tarlera and Denner 2003
             16 Genus Sulfurisoma Kojima and Fukui 2014
             17 Genus Sulfuritalea Kojima and Fukui 2011
             18 Genus Thauera Macy et al. 1993
             19 Genus Uliginosibacterium Weon et al. 2008
             20 Genus Zoogloea Itzigsohn 1868 (Approved Lists 1980)