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Citrobacter freundii.jpg
Citrobacter freundii, one member of the order
Scientific classification e
Domain: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Enterobacterales
Adeolu et al., 2016
  • "Enterobacteriales"

Enterobacterales with its type genus Enterobacter is an order of Gram-negative bacteria.[1]

Historical identification and systematics

Enterobacterales was proposed in 2005 under the name "Enterobacteriales". However, the name "Enterobacteriales" was not validated, thus it lacked standing in nomenclature, so the name should be written in parentheses. "Enterobacteriales" was a monotypic order, containing only the family Enterobacteriaceae, and shared its type genus Escherichia.[2][3][4]

In 2016, "Enterobacteriales" was proposed to be reclassified as Enterobacterales, and the type genus changed to Enterobacter. This was to avoid the confusion that would be generated by renaming the order to "Escherichiales"; in contrast, the name "Enterobacteriales" remains a commonly used synonym for the order. In addition, several new families within the Enterobacterales were proposed, consisting of species that were formerly members of the Enterobacteriaceae.[1] The Thorselliaceae may also be considered a member of this order.[5]


Phylogeny of Enterobacterales









Phylogeny of the Enterobacterales as proposed in 2016.[1] Note that the Thorselliaceae are not included. Pasteurellales is used as the outgroup.

Validly published genera

The following genera have been validly published, thus they have "Standing in Nomenclature". The year the genus was proposed is listed in parentheses after the genus name.

Candidatus genera

  • "Candidatus Annandia"
  • "Candidatus Arocatia"
  • "Candidatus Aschnera"
  • "Candidatus Benitsuchiphilus"
  • "Candidatus Blochmannia"
  • "Candidatus Curculioniphilus"
  • "Candidatus Cuticobacterium"
  • "Candidatus Doolittlea"
  • "Candidatus Fukatsuia"
  • "Candidatus Gillettellia"
  • "Candidatus Gullanella"
  • "Candidatus Hamiltonella"
  • "Candidatus Hartigia"
  • "Candidatus Hoaglandella"
  • "Candidatus Ischnodemia"
  • "Candidatus Ishikawaella"
  • "Candidatus Kleidoceria"
  • "Candidatus Kotejella"
  • "Candidatus Macropleicola"
  • "Candidatus Mikella"
  • "Candidatus Moranella"
  • "Candidatus Phlomobacter"
  • "Candidatus Profftia"
  • "Candidatus Purcelliella"
  • "Candidatus Regiella"
  • "Candidatus Riesia"
  • "Candidatus Rohrkolberia"
  • "Candidatus Rosenkranzia"
  • "Candidatus Schneideria"
  • "Candidatus Stammera"
  • "Candidatus Stammerula"
  • "Candidatus Tachikawaea"
  • "Candidatus Westeberhardia"

Proposed, but have not obtained standing in nomenclature

  • Aquamonas (2009)
  • Aranicola (1997)
  • Atlantibacter (2016)
  • Averyella (2005)
  • Grimontella (2003)
  • Guhaiyinggella (1995)
  • Margalefia (2004)
  • Tiedjeia (2005)


  1. ^ a b c Adeolu, M.; et al. (2016). "Genome based phylogeny and taxonomy of the 'Enterobacteriales': proposal for Enterobacterales ord. nov. divided into the families Enterobacteriaceae, Erwiniaceae fam. nov., Pectobacteriaceae fam. nov., Yersiniaceae fam. nov., Hafniaceae fam. nov., Morganellaceae fam. nov., and Budviciaceae fam. nov". Int. J. Syst. Evol. Microbiol.
  2. ^ Zipcodezoo site Enterobacteriales Archived 2014-04-27 at the Wayback Machine accessed 9 Mar 2013
  3. ^ NCBI Enterobacteriales accessed 9 Mar 2013
  4. ^ Taxonomicon Enterobacteriales accessed 9 Mar 2013
  5. ^ Kämpfer, P; Glaeser, SP; Nilsson, LKJ; Eberhard, T; Håkansson, S; Guy, L; Roos, S; Busse, HJ; Terenius, O (2015). "Proposal of Thorsellia kenyensis sp. nov. and Thorsellia kandunguensis sp. nov., isolated from the larvae of Anopheles arabiensis as members of the family Thorselliaceae fam. nov". Int J Syst Evol Microbiol. 65 (Pt 2): 444–451. doi:10.1099/ijs.0.070292-0. PMID 25385997.