Procaryotic Genera Domain "Bacteria" Woese et al. 1990 Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005 Class "Betaproteobacteria" Garrity et al. 2001 nom. ined. see Class Betaproteobacteria Garrity et al. 2006 Order "Rhodocyclales" [monotypic] see Order Rhodocyclales Garrity et al. 2006 Family "Rhodocyclaceae" see 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 05 Genus Azovibrio Reinhold-Hurek and Hurek 2000 06 Genus Ferribacterium Cummings et al. 2000 07 Genus Propionibacter Meijer et al. 1999 see Genus Propionivibrio Tanaka et al. 1991 08 Genus Propionivibrio Tanaka et al. 1991 09 Genus Thauera Macy et al. 1993 10 Genus Zoogloea Itzigsohn 1868 (Approved Lists 1980)