[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 Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006
           Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
             01 Genus Hyphomicrobium Stutzer and Hartleb 1898 (Approved Lists 1980)
             02 Genus Ancalomicrobium Staley 1968 (Approved Lists 1980)
             03 Genus Ancylobacter Raj 1983
             03.0 Genus Microcyclus Ørskov 1928 (Approved Lists 1980) nom. illeg. see Genus Ancylobacter Raj 1983
             04 Genus Angulomicrobium Vasil'eva et al. 1986
             05 Genus Aquabacter Irgens et al. 1993
             06 Genus Azorhizobium Dreyfus et al. 1988
             07 Genus Blastochloris Hiraishi 1997
             08 Genus Devosia Nakagawa et al. 1996
             09 Genus Dichotomicrobium Hirsch and Hoffman 1989
             10 Genus Filomicrobium Schlesner 1988
             11 Genus Gemmiger Gossling and Moore 1975 (Approved Lists 1980)
             12 Genus Labrys Vasilyeva and Semenov 1985
             13 Genus Methylorhabdus Doronina et al. 1996
             14 Genus Pedomicrobium Aristovskaya 1961 (Approved Lists 1980)
             15 Genus Prosthecomicrobium Staley 1968 (Approved Lists 1980)
             16 Genus Rhodomicrobium Duchow and Douglas 1949 (Approved Lists 1980)
             17 Genus Rhodoplanes Hiraishi and Ueda 1994
             18 Genus Seliberia Aristovskaya and Parinkina 1963 (Approved Lists 1980)
             19 Genus Starkeya Kelly et al. 2000
             20 Genus Xanthobacter Wiegel et al. 1978 (Approved Lists 1980)