Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Gammaproteobacteria" nom. inval. see Class Gammaproteobacteria Garrity et al. 2005
       Order "Xanthomonadales" see Order Xanthomonadales Saddler and Bradbury 2005
         Family "Xanthomonadaceae" see Family Xanthomonadaceae Saddler and Bradbury 2005
           Genus Frateuria Swings et al. 1980
           Genus Lysobacter Christensen and Cook 1978 (Approved Lists 1980)
           Genus Nevskia Famintzin 1892 (Approved Lists 1980)
           Genus Pseudoxanthomonas Finkmann et al. 2000
           Genus Rhodanobacter Nalin et al. 1999
           Genus Stenotrophomonas Palleroni and Bradbury 1993
           Genus Xylella Wells et al. 1987
           1 Genus Xanthomonas Dowson 1939 (Approved Lists 1980)