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
                       Genus Xanthobacterᵀ Wiegel et al. 1978 (Approved Lists 1980)
                         1 Xanthobacter agilis Jenni and Aragno 1988
                         2 Xanthobacter aminoxidans Doronina and Trotsenko 2003
                         3 Xanthobacter autotrophicusᵀ (Baumgarten et al. 1974) Wiegel et al. 1978 (Approved Lists 1980)
                         4 Xanthobacter flavus Malik and Claus 1979 (Approved Lists 1980)
                         5 Xanthobacter tagetidis Padden et al. 1997
                         6 Xanthobacter viscosus Doronina and Trotsenko 2003