[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota Margulis 1974 nom. nud.
     Kingdom Bacteria Cavalier-Smith 2002 stat. inval. - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
       Subkingdom Negibacteria Cavalier-Smith 2002 stat. inval. - negibacteria see Domain Bacteria Woese et al. 1990 stat. inval.
         Phylum Proteobacteria Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
           Class Betaproteobacteria Garrity et al. 2006
             1 Genus Chitinivorax Chen et al. 2012
             2 Order Burkholderiales Garrity et al. 2006
             3 Order Hydrogenophilales Garrity et al. 2006
             4 Order Methylophilales Garrity et al. 2006 see Order Spirillales Prévot 1940 (Approved Lists 1980)
             5 Order Neisseriales Tønjum 2006
             6 Order Nitrosomonadales Garrity et al. 2006 nom. illeg. see Order Spirillales Prévot 1940 (Approved Lists 1980)
             7 Order "Procabacteriales" (sic) Garrity et al. 2002 nom. pro-inval. see Order Procaibacterales corrig. Garrity et al. 2002 nom. nud.
             8 Order Rhodocyclales Garrity et al. 2006