[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         1 Order Burkholderiales Garrity et al. 2006
         2 Order Hydrogenophilales Garrity et al. 2006
         3 Order Methylophilales Garrity et al. 2006 see Order Spirillales Prévot 1940 (Approved Lists 1980)
         4 Order Neisseriales Tønjum 2006
         5 Order Nitrosomonadales Garrity et al. 2006 nom. illeg. see Order Spirillales Prévot 1940 (Approved Lists 1980)
         6 Order Rhodocyclales Garrity et al. 2006
         7 Order "Procabacteriales" (sic) Garrity et al. 2002 nom. pro-inval. see Order Procaibacterales corrig. Garrity et al. 2002 nom. nud.