Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Alphaproteobacteria" Garrity and Holt 2001 nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
       Order "Rhodobacterales" see Order Rhodobacterales Garrity et al. 2006
         Family "Rhodobacteraceae" see Family Rhodobacteraceae Garrity et al. 2006
           Genus Ahrensia Uchino et al. 1999
           Genus Amaricoccus Maszenan et al. 1997
           Genus Antarctobacter Labrenz et al. 1998
           Genus Gemmobacter Rothe et al. 1988
           Genus Hirschia Schlesner et al. 1990
           Genus Hyphomonas (ex Pongratz 1957) Moore et al. 1984
           Genus Maricaulis Abraham et al. 1999
           Genus Octadecabacter Gosink et al. 1998
           Genus Paracoccus Davis 1969 (Approved Lists 1980)
           Genus Rhodovulum Hiraishi and Ueda 1994
           Genus Roseivivax Suzuki et al. 1999
           Genus Roseobacter Shiba 1991
           Genus Roseovarius Labrenz et al. 1999
           Genus Rubrimonas Suzuki et al. 1999
           Genus Ruegeria Uchino et al. 1999
           Genus Sagittula Gonzalez et al. 1997
           Genus Staleya Labrenz et al. 2000 see Genus Sulfitobacter Sorokin 1996
           Genus Stappia Uchino et al. 1999
           Genus Sulfitobacter Sorokin 1996
           1 Genus Rhodobacter Imhoff et al. 1984