prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   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. [monotypic]
           Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
             01 Genus Arsenophonus Gherna et al. 1991
             02 Genus Biostraticola Verbarg et al. 2008
             03 Genus Brenneria Hauben et al. 1999
             04 Genus Buchnera Munson et al. 1991
             05 Genus Budvicia Bouvet et al. 1985
             06 Genus Buttiauxella Ferragut et al. 1982
             07 Genus Calymmatobacterium Aragão and Vianna 1913 (Approved Lists 1980) see Genus Klebsiella Trevisan 1885 (Approved Lists 1980)
             08 Genus Cedecea Grimont et al. 1981
             09 Genus Citrobacter Werkman and Gillen 1932 (Approved Lists 1980)
             10 Genus Cosenzaea Giammanco et al. 2011
             11 Genus Cronobacter Iversen et al. 2008
             12 Genus Dickeya Samson et al. 2005
             13 Genus Edwardsiella Ewing and McWhorter 1965 (Approved Lists 1980)
             14 Genus Enterobacillus Patil et al. 2015
             15 Genus Enterobacter Hormaeche and Edwards 1960 (Approved Lists 1980)
             16 Genus Erwinia Winslow et al. 1920 (Approved Lists 1980)
             17 Genus Escherichia Castellani and Chalmers 1919 (Approved Lists 1980)
             18 Genus Ewingella Grimont et al. 1984
             19 Genus Franconibacter Stephan et al. 2014
             20 Genus Gibbsiella Brady et al. 2011
             21 Genus Hafnia Møller 1954 (Approved Lists 1980)
             22 Genus Klebsiella Trevisan 1885 (Approved Lists 1980)
             23 Genus Kluyvera Farmer et al. 1981
             24 Genus Leclercia Tamura et al. 1987
             25 Genus Leminorella Hickman-Brenner et al. 1985
             26 Genus Levinea Young et al. 1971 (Approved Lists 1980) see Genus Citrobacter Werkman and Gillen 1932 (Approved Lists 1980)
             27 Genus Lonsdalea Brady et al. 2012
             28 Genus Mangrovibacter Rameshkumar et al. 2010
             29 Genus Moellerella Hickman-Brenner et al. 1984
             30 Genus Morganella Fulton 1943 (Approved Lists 1980)
             31 Genus Obesumbacterium Shimwell 1963 (Approved Lists 1980)
             32 Genus Pantoea Gavini et al. 1989
             33 Genus Pectobacterium Waldee 1945 (Approved Lists 1980)
             34 Genus Phaseolibacter Halpern et al. 2013
             35 Genus Photorhabdus Boemare et al. 1993
             36 Genus Plesiomonas corrig. Habs and Schubert 1962 (Approved Lists 1980)
             37 Genus Pragia Aldová et al. 1988
             38 Genus Proteus Hauser 1885 (Approved Lists 1980)
             39 Genus Providencia Ewing 1962 (Approved Lists 1980)
             40 Genus Rahnella Izard et al. 1981
             41 Genus Raoultella Drancourt et al. 2001
             42 Genus Rouxiella Le Flèche-Matéos et al. 2015
             43 Genus Saccharobacter Yaping et al. 1990
             44 Genus Salmonella Lignieres 1900 (Approved Lists 1980)
             45 Genus Samsonia Sutra et al. 2001
             46 Genus Serratia Bizio 1823 (Approved Lists 1980)
             47 Genus Shigella Castellani and Chalmers 1919 (Approved Lists 1980)
             48 Genus Shimwellia Priest and Barker 2010
             49 Genus Sodalis Dale and Maudlin 1999
             50 Genus Tatumella Hollis et al. 1982
             51 Genus Thorsellia Kämpfer et al. 2006
             52 Genus Trabulsiella McWhorter et al. 1992
             53 Genus Wigglesworthia Aksoy 1995
             54 Genus Xenorhabdus Thomas and Poinar 1979 (Approved Lists 1980)
             55 Genus Yersinia van Loghem 1944 (Approved Lists 1980)
             56 Genus Yokenella Kosako et al. 1985