procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Betaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Betaproteobacteria Garrity et al. 2006
         Order "Rhodocyclales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Rhodocyclales Garrity et al. 2006
           1 Family "Rhodocyclaceae" "Garrity and Holt 2001" nom. nud. see Family Rhodocyclaceae Garrity et al. 2006