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 Rhodobiaceae Garrity et al. 2006
             1 Genus Afifella Urdiain et al. 2009
             2 Genus Anderseniella Brettar et al. 2007
             3 Genus Lutibaculum Anil Kumar et al. 2012
             4 Genus Parvibaculum Schleheck et al. 2004
             5 Genus Rhodobium Hiraishi et al. 1995
             6 Genus Rhodoligotrophos Fukuda et al. 2012
             7 Genus Roseospirillum Glaeser and Overmann 2001 nom. inval.
             8 Genus Tepidamorphus Albuquerque et al. 2010
             9 Genus Tepidicaulis Takeuchi et al. 2015