procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Gammaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Gammaproteobacteria Garrity et al. 2005
         Order "Xanthomonadales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Xanthomonadales Saddler and Bradbury 2005 nom. illeg.
           Family "Xanthomonadaceae" "Garrity and Holt 2001" nom. nud. see Family Xanthomonadaceae Saddler and Bradbury 2005 nom. illeg.
             1 Genus Xanthomonas Dowson 1939 (Approved Lists 1980)
             2 Genus Frateuria Swings et al. 1980
             3 Genus Lysobacter Christensen and Cook 1978 (Approved Lists 1980)
             4 Genus Nevskia Famintzin 1892 (Approved Lists 1980)
             5 Genus Pseudoxanthomonas Finkmann et al. 2000
             6 Genus Rhodanobacter Nalin et al. 1999
             7 Genus Stenotrophomonas Palleroni and Bradbury 1993
             8 Genus Xylella Wells et al. 1987