[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 Betaproteobacteria Garrity et al. 2006
         Order Rhodocyclales Garrity et al. 2006
           Family Rhodocyclaceae Garrity et al. 2006
             01 Genus Rhodocyclus Pfennig 1978 (Approved Lists 1980)
             02 Genus Azoarcus Reinhold-Hurek et al. 1993
             03 Genus Azonexus Reinhold-Hurek and Hurek 2000
             04 Genus Azospira Reinhold-Hurek and Hurek 2000
             04.0 Genus Dechlorosoma Achenbach et al. 2001 see Genus Azospira Reinhold-Hurek and Hurek 2000
             05 Genus Azovibrio Reinhold-Hurek and Hurek 2000
             06 Genus Dechloromonas Achenbach et al. 2001
             07 Genus Denitratisoma Fahrbach et al. 2006
             08 Genus Ferribacterium Cummings et al. 2000
             09 Genus Propionivibrio Tanaka et al. 1991
             09.0 Genus Propionibacter Meijer et al. 1999 see Genus Propionivibrio Tanaka et al. 1991
             10 Genus Quatrionicoccus Tindall and Euzéby 2006
             11 Genus Shinella An et al. 2006
             11.0 Genus Crabtreella Xie and Yokota 2006 see Genus Shinella An et al. 2006
             12 Genus Sterolibacterium Tarlera and Denner 2003
             13 Genus Thauera Macy et al. 1993
             14 Genus Zoogloea Itzigsohn 1868 (Approved Lists 1980)