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 "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhizobiales Kuykendall 2006
                     Family Xanthobacteraceae Lee et al. 2005
                       1 Genus Ancylobacter Raj 1983
                       2 Genus Azorhizobium Dreyfus et al. 1988
                       3 Genus Labrys Vasilyeva and Semenov 1985
                       4 Genus Pseudolabrys Kämpfer et al. 2006 [monotypic]
                       5 Genus Pseudoxanthobacter Arun et al. 2008 [monotypic]
                       6 Genus Starkeya Kelly et al. 2000
                       7 Genus Xanthobacterᵀ Wiegel et al. 1978 (Approved Lists 1980)