Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 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 Xylella Wells et al. 1987 [monotypic]
                         Xylella fastidiosaᵀ Wells et al. 1987
                           1 Xylella fastidiosa subsp. fastidiosaᵀ (Wells et al. 1987) Schaad et al. 2009
                           2 Xylella fastidiosa subsp. multiplex Schaad et al. 2009