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 "Rhizobiales" see Order Rhizobiales Kuykendall 2006
         Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
           Genus Ancalomicrobium Staley 1968 (Approved Lists 1980)
           Genus Ancylobacter Raj 1983
           Genus Angulomicrobium Vasil'eva et al. 1986
           Genus Aquabacter Irgens et al. 1993
           Genus Azorhizobium Dreyfus et al. 1988
           Genus Blastochloris Hiraishi 1997
           Genus Devosia Nakagawa et al. 1996
           Genus Dichotomicrobium Hirsch and Hoffman 1989
           Genus Filomicrobium Schlesner 1988
           Genus Gemmiger Gossling and Moore 1975 (Approved Lists 1980)
           Genus Labrys Vasilyeva and Semenov 1985
           Genus Methylorhabdus Doronina et al. 1996
           Genus Pedomicrobium Aristovskaya 1961 (Approved Lists 1980)
           Genus Prosthecomicrobium Staley 1968 (Approved Lists 1980)
           Genus Rhodomicrobium Duchow and Douglas 1949 (Approved Lists 1980)
           Genus Rhodoplanes Hiraishi and Ueda 1994
           Genus Seliberia Aristovskaya and Parinkina 1963 (Approved Lists 1980)
           Genus Xanthobacter Wiegel et al. 1978 (Approved Lists 1980)
           1 Genus Hyphomicrobium Stutzer and Hartleb 1898 (Approved Lists 1980)