Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Betaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Betaproteobacteriaᵀ Garrity et al. 2006
                   1 Genus Chitinivorax Chen et al. 2012, incertae sedis [monotypic]
                   2 Order Burkholderiales Garrity et al. 2006
                   3.1 Order Hydrogenophilales Garrity et al. 2006 [monotypic]
                   3.2 Order Sulfuricellales Watanabe et al. 2015 [monotypic]
                   4 Order Methylophilales Garrity et al. 2006 [monotypic]
                   5 Order Neisseriales Tønjum 2006
                   6 Order Nitrosomonadales Garrity et al. 2006
                   7 Order Rhodocyclales Garrity et al. 2006 [monotypic]
                   8 Order "Procabacteriales" Garrity et al., 2003 [monotypic]