Name: Flexibacter aurantiacus Lewin 1969 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: au.ran.ti’a.cus. N.L. masc. adj. aurantiacus, orange-coloured

Pronunciation (Latin), gender: fle-xi-BAK-ter a͡u-ran-TI-a-kus, masculine

Type strain: ATCC 23107; DSM 6792; IFO 15970; LMG 3987; NBRC 15970; VKM B-1426

Conduct genome-based taxonomy at

16S rRNA gene: M62792 Analyse FASTA

Effective publication: Lewin RA. A classification of flexibacteria. J Gen Microbiol 1969; 58:189-206.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Flavobacterium johnsoniae subsp. aurantiacum (Lewin 1969) García-López et al. 2020

Risk group: 1

• Synonyms:

  • Name	Kind
    Flavobacterium johnsoniae subsp. aurantiacum (Lewin 1969) García-López et al. 2020	homotypic synonym, validly published under the ICNP, distinct rank

• Notes:
  • ⏲ According to Bernardet et al. (1996), this species is a later heterotypic synonym of Flavobacterium johnsoniae corrig. (Stanier 1947) Bernardet et al. 1996. Publication: Bernardet JF, Segers P, Vancanneyt M, Berthe F, Kersters K, Vandamme P. Cutting a Gordian knot: emended classification and description of the genus Flavobacterium, emended description of the family Flavobacteriaceae, and proposal of Flavobacterium hydatis nom. nov. (basonym, Cytophaga aquatilis Strohl and Tait 1978). Int. J. Syst. Bacteriol. 1996; 46:128-148. 🇫🇷
  • ⏲ According to Bernardet et al. (1996), this species is a later heterotypic synonym of Cytophaga johnsonae Stanier 1947 (Approved Lists 1980). Publication: Bernardet JF, Segers P, Vancanneyt M, Berthe F, Kersters K, Vandamme P. Cutting a Gordian knot: emended classification and description of the genus Flavobacterium, emended description of the family Flavobacteriaceae, and proposal of Flavobacterium hydatis nom. nov. (basonym, Cytophaga aquatilis Strohl and Tait 1978). Int. J. Syst. Bacteriol. 1996; 46:128-148. 🇫🇷
  • ⏲ According to Bernardet et al. (1996), this species is a later heterotypic synonym of Cytophaga johnsoniae corrig. Stanier 1947 (Approved Lists 1980). Publication: Bernardet JF, Segers P, Vancanneyt M, Berthe F, Kersters K, Vandamme P. Cutting a Gordian knot: emended classification and description of the genus Flavobacterium, emended description of the family Flavobacteriaceae, and proposal of Flavobacterium hydatis nom. nov. (basonym, Cytophaga aquatilis Strohl and Tait 1978). Int. J. Syst. Bacteriol. 1996; 46:128-148. 🇫🇷
  • ⏲ According to Garcia-Lopez et al. (2019), this species is not a later heterotypic synonym of Flavobacterium johnsoniae corrig. (Stanier 1947) Bernardet et al. 1996. Publication: Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083. 🇩🇪
  • ⏲ According to Garcia-Lopez et al. (2019), this species is not a later heterotypic synonym of Cytophaga johnsonae Stanier 1947 (Approved Lists 1980). Publication: Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083. 🇩🇪
  • ⏲ According to Garcia-Lopez et al. (2019), this species is not a later heterotypic synonym of Cytophaga johnsoniae corrig. Stanier 1947 (Approved Lists 1980). Publication: Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083. 🇩🇪
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Garrity GM. Validation list no. 193. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2020; 70:2960-2966.
  • ❗ Flexibacter aurantiacus is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Flexibacter.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 1, note = "animal pathogen - biological class of risk animal: 2". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 3 times in PubMed until 2026-06-11.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.

Subdivision:

Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 0
Total number of child taxa: 1

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Flexibacter aurantiacus subsp. excathedrus" Lewin 1969	not validly published	preferred name

Parent taxon: Flexibacter Soriano 1945 (Approved Lists 1980)

Assigned by: Lewin RA. A classification of flexibacteria. J Gen Microbiol 1969; 58:189-206.

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Record number: 776287