Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
       1 Class "Alphaproteobacteria" Garrity and Holt 2001 nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
       2 Class "Betaproteobacteria" Garrity et al. 2001 nom. ined. see Class Betaproteobacteria Garrity et al. 2006
       3 Class "Gammaproteobacteria" nom. inval. see Class Gammaproteobacteria Garrity et al. 2005
       4 Class "Deltaproteobacteria" Garrity et al. 2001 nom. ined. see Class Deltaproteobacteria Kuever et al. 2006
       5 Class "Epsilonproteobacteria" nom. inval. [monotypic] see Class Epsilonproteobacteria Garrity et al. 2006