prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   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 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
             8 Genus Tepidamorphus Albuquerque et al. 2010
             9 Genus Tepidicaulis Takeuchi et al. 2015