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 "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Lysobacterales Christensen and Cook 1978 (Approved Lists 1980)
                     Family Lysobacteraceaeᵀ Christensen and Cook 1978 (Approved Lists 1980)
                       Genus Xanthomonas Dowson 1939 (Approved Lists 1980)
                         Xanthomonas citri (ex Hasse 1915) Gabriel et al. 1989
                           1 Xanthomonas citri subsp. citriᵀ (Gabriel et al. 1989) Schaad et al. 2007
                           2 Xanthomonas citri subsp. malvacearum (ex Smith 1901) Schaad et al. 2007