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 alfalfae (ex Riker et al. 1935) Schaad et al. 2007
                           Xanthomonas alfalfae subsp. citrumelonis Schaad et al. 2007