Name: Rahnella Izard et al. 1981

Category: Genus

Proposed as: gen. nov.

Etymology: Rah.nel’la. L. fem. dim. n. suff. -ella, diminutive ending; N.L. fem. dim. n. Rahnella, named after Otto Rahn, the German-American microbiologist who proposed the name Enterobacteriaceae in 1937

Gender, pronunciation: feminine (stem: Rahnell-), rah-NEL-la

Type species: Rahnella aquatilis Izard et al. 1981

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective publication: Izard D, Gavini F, Trinel PA, Leclerc H. Rahnella aquatilis, nouveau membre de la famille des Enterobacteriaceae. Ann. Microbiol. 1979; 130A:163-177.

IJSEM list: Anonymous. Validation list no. 7. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1981; 31:382-383.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Emendations:
  • Brady et al. 2014 Brady C, Hunter G, Kirk S, Arnold D, Denman S. Rahnella victoriana sp. nov., Rahnella bruchi sp. nov., Rahnella woolbedingensis sp. nov., classification of Rahnella genomospecies 2 and 3 as Rahnella variigena sp. nov. and Rahnella inusitata sp. nov., respectively and emended description of the genus Rahnella. Syst Appl Microbiol 2014; 37:545-552. Oren A, Garrity GM. List of changes in taxonomic opinion no. 22. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2015; 65:2028-2029.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 5 new species in the genus.
  • Jeon et al. 2021 Jeon D, Kim IS, Lee SD. Rahnella laticis sp. nov. and Rahnella contaminans sp. nov., and emended description of the genus Rahnella. Int J Syst Evol Microbiol 2021; 71:4893. Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 7 of the IJSEM. Int J Syst Evol Microbiol 2021; 71:5006.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 2 new species in the genus.
  • Brady et al. 2022 Brady C, Asselin JA, Beer S, Brurberg MB, Crampton B, Venter S, Arnold D, Denman S. Rahnella perminowiae sp. nov., Rahnella bonaserana sp. nov., Rahnella rivi sp. nov. and Rahnella ecdela sp. nov., isolated from diverse environmental sources, and emended description of the genus Rahnella. Int J Syst Evol Microbiol 2022; 72:5190.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 4 new species in the genus.
    • 🧍 This emendation was not found in the expected IJSEM notification list.

• Notes:
  • 🧕 Boone et al. (2001) assigned this genus to the family Enterobacteriaceae Rahn 1937 (Approved Lists 1980). Publication: Garrity GM, Holt JG. The Road Map to the Manual. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 119-166.
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Rahaella"; "Rhanella"; "Rrahnella"; "Ruhnella".
  • 💁 Taxonomists who have recently focused on this group are the corresponding authors of Brady et al. (2022), Jeon et al. (2021). Editors in search of reviewers are advised to consider additional criteria such as whether a taxon is covered by one of the ICSP subcommittees.
  • 🧬 The phylogenomic assignment score of this taxon is 0.01070 (N = 7).
  • 🎰 The BRCs most frequently used for deposits in this group are: LMG: 10; DSM: 10; CIP: 3; NBRC: 3; KACC: 2; JCM: 2; CCUG: 1; GDMCC: 1; ATCC: 1; MTCC: 1.
  • 🧍 Pittman et al. (1991) suggested the abbreviation "RHNL" for this genus name but this does not appear to be of practical relevance any longer. Publication: Pittman KF, Walczak CA, Lock CM. Codes and abbreviations for approved of effectively published names of genera of bacteria published from January 1980 to December 1990. Int J Syst Bacteriol 1991; 41:571-579.
  • 🧍 The genus Rahnella Izard et al. 1981 encompasses three genomospecies: GS 1 (Rahnella aquatilis sensu stricto), GS 2 and GS 3. It is not possible to phenotypically differentiate Rahnella aquatilis from the other genomospecies. So, the genomospecies 2 and 3 are not formally named. Publication: Brenner DJ, Muller HE, Steigerwalt AG, Whitney AM, O'Hara CM, Kampfer P. Two new Rahnella genomospecies that cannot be phenotypically differentiated from Rahnella aquatilis. Int J Syst Bacteriol 1998; 48:141-149.

Subdivision:

Number of child taxa with a validly published and correct name: 14
Number of child taxa with a validly published name, including synonyms: 14
Total number of child taxa: 16

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Rahnella aceris Lee et al. 2021	validly published under the ICNP	correct name
    "Rahnella aquatica" Spröer et al. 1999	not validly published	preferred name
    Rahnella aquatilis Izard et al. 1981	validly published under the ICNP	correct name
    Rahnella bonaserana Brady et al. 2022	validly published under the ICNP	correct name
    Rahnella bruchi Brady et al. 2017	validly published under the ICNP	correct name
    Rahnella contaminans Jeon et al. 2021	validly published under the ICNP	correct name
    Rahnella ecdela Brady et al. 2022	validly published under the ICNP	correct name
    Rahnella inusitata Brady et al. 2017	validly published under the ICNP	correct name
    Rahnella laticis Jeon et al. 2021	validly published under the ICNP	correct name
    Rahnella perminowiae Brady et al. 2022	validly published under the ICNP	correct name
    Rahnella rivi Brady et al. 2022	validly published under the ICNP	correct name
    Rahnella selenatireducens Zhang et al. 2025	validly published under the ICNP	correct name
    "Rahnella sikkimica" Kumar et al. 2022	not validly published	preferred name
    Rahnella variigena Brady et al. 2017	validly published under the ICNP	correct name
    Rahnella victoriana Brady et al. 2017	validly published under the ICNP	correct name
    Rahnella woolbedingensis Brady et al. 2017	validly published under the ICNP	correct name

Parent taxon: Yersiniaceae Adeolu et al. 2016

Assigned by: Adeolu M, Alnajar S, Naushad S, S Gupta R. 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 2016; 66:5575-5599.

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Record number: 516450