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 "Enterobacteriales" Garrity and Holt 2001 nom. nud.
         Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
           Genus Alterococcus Shieh and Jean 1999
           Genus Arsenophonus Gherna et al. 1991
           Genus Brenneria Hauben et al. 1999
           Genus Buchnera Munson et al. 1991
           Genus Budvicia Bouvet et al. 1985
           Genus Buttiauxella Ferragut et al. 1982
           Genus Calymmatobacterium Aragão and Vianna 1913 (Approved Lists 1980) see Genus Klebsiella Trevisan 1885 (Approved Lists 1980)
           Genus Cedecea Grimont et al. 1981
           Genus Citrobacter Werkman and Gillen 1932 (Approved Lists 1980)
           Genus Edwardsiella Ewing and McWhorter 1965 (Approved Lists 1980)
           Genus Enterobacter Hormaeche and Edwards 1960 (Approved Lists 1980)
           Genus Erwinia Winslow et al. 1920 (Approved Lists 1980)
           Genus Ewingella Grimont et al. 1984
           Genus Hafnia Møller 1954 (Approved Lists 1980)
           Genus Klebsiella Trevisan 1885 (Approved Lists 1980)
           Genus Kluyvera Farmer et al. 1981
           Genus Leclercia Tamura et al. 1987
           Genus Leminorella Hickman-Brenner et al. 1985
           Genus Moellerella Hickman-Brenner et al. 1984
           Genus Morganella Fulton 1943 (Approved Lists 1980)
           Genus Obesumbacterium Shimwell 1963 (Approved Lists 1980)
           Genus Pantoea Gavini et al. 1989
           Genus Pectobacterium Waldee 1945 (Approved Lists 1980)
           Genus Photorhabdus Boemare et al. 1993
           Genus Plesiomonas corrig. Habs and Schubert 1962 (Approved Lists 1980)
           Genus Pragia Aldová et al. 1988
           Genus Proteus Hauser 1885 (Approved Lists 1980)
           Genus Providencia Ewing 1962 (Approved Lists 1980)
           Genus Rahnella Izard et al. 1981
           Genus Saccharobacter Yaping et al. 1990
           Genus Salmonella Lignieres 1900 (Approved Lists 1980)
           Genus Serratia Bizio 1823 (Approved Lists 1980)
           Genus Shigella Castellani and Chalmers 1919 (Approved Lists 1980)
           Genus Sodalis Dale and Maudlin 1999
           Genus Tatumella Hollis et al. 1982
           Genus Trabulsiella McWhorter et al. 1992
           Genus Wigglesworthia Aksoy 1995
           Genus Xenorhabdus Thomas and Poinar 1979 (Approved Lists 1980)
           Genus Yersinia van Loghem 1944 (Approved Lists 1980)
           Genus Yokenella Kosako et al. 1985
           1 Genus Escherichia Castellani and Chalmers 1919 (Approved Lists 1980)