prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
           Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
             01 Genus Ancalomicrobium Staley 1968 (Approved Lists 1980)
             02 Genus Angulomicrobium Vasil'eva et al. 1986
             03 Genus Aquabacter Irgens et al. 1993
             04 Genus Blastochloris Hiraishi 1997
             05 Genus Cucumibacter Hwang and Cho 2008
             06 Genus Devosia Nakagawa et al. 1996
             07 Genus Dichotomicrobium Hirsch and Hoffmann 1989
             08 Genus Filomicrobium Schlesner 1988
             09 Genus Gemmiger Gossling and Moore 1975 (Approved Lists 1980)
             10 Genus Hyphomicrobium Stutzer and Hartleb 1899 (Approved Lists 1980)
             11 Genus Maritalea Hwang et al. 2009
             12 Genus Methylorhabdus Doronina et al. 1996
             13 Genus Methyloterrigena Kim et al. 2016
             14 Genus Paradevosia Geng et al. 2015
             15 Genus Pedomicrobium Aristovskaya 1961 (Approved Lists 1980)
             16 Genus Pelagibacterium Xu et al. 2011
             17 Genus Prosthecomicrobium Staley 1968 (Approved Lists 1980)
             18 Genus Rhodomicrobium Duchow and Douglas 1949 (Approved Lists 1980)
             19 Genus Rhodoplanes Hiraishi and Ueda 1994
             20 Genus Seliberia Aristovskaya and Parinkina 1963 (Approved Lists 1980)
             21 Genus Zhangella Xu et al. 2009 see Genus Maritalea Hwang et al. 2009