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
         1 Order "Burkholderiales" "Garrity and Holt 2001" nom. nud. see Order Burkholderiales Garrity et al. 2006
         2 Order "Hydrogenophilales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Hydrogenophilales Garrity et al. 2006
         3 Order "Methylophilales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Methylophilales Garrity et al. 2006
         4 Order "Neisseriales" "Garrity and Holt 2001" nom. nud. see Order Neisseriales Tønjum 2006
         5 Order "Nitrosomonadales" "Garrity and Holt 2001" nom. nud. see Order Nitrosomonadales Garrity et al. 2006 nom. illeg.
         6 Order "Rhodocyclales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Rhodocyclales Garrity et al. 2006