[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order "Enterobacteriales" Garrity and Holt 2001 nom. nud.
           Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
             Genus Shigella Castellani and Chalmers 1919 (Approved Lists 1980)
               1 Shigella dysenteriae (Shiga 1897) Castellani and Chalmers 1919 (Approved Lists 1980)
               2 Shigella boydii Ewing 1949 (Approved Lists 1980)
               3 Shigella flexneri Castellani and Chalmers 1919 (Approved Lists 1980)
               4 Shigella sonnei (Levine 1920) Weldin 1927 (Approved Lists 1980)