Procaryotic Genera
   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 "Bradyrhizobiaceae" Garrity et al. 2001 nom. ined. see Family Bradyrhizobiaceae Garrity et al. 2006
             Genus Oligotropha Meyer et al. 1994