Species Flexibacter tractuosus

Name: Flexibacter tractuosus (Lewin 1969) Leadbetter 1974 (Approved Lists 1980)

Category, proposed as: species, comb. nov.

Basonym: "Microscilla tractuosa" Lewin 1969

Etymology: trac.tu.o’sus. L. masc. adj. tractuosus, that draws to itself, intended to mean drawn or clumped together

Pronunciation (Latin), gender: fle-xi-BAK-ter trak-tu-O-sus, masculine

Type strain: ATCC 23168; CIP 106410; DSM 4126; H 43; KCTC 2958; LMG 8378; NBRC 15989; NCIMB 1408; NCMB 1408; VKM B-1430

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB078072 Analyse FASTA

Effective publication: Leadbetter ER. Genus II. Flexibacter Soriano 1945, 92, Lewin 1969, 192 emend. mut. char. In: Buchanan RE, N.e G (eds), Bergey's Manual of Determinative Bacteriology, 8th ed., The Williams & Wilkins Co, Baltimore, 1974, p. 105-107.

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: Marivirga tractuosa (Lewin 1969) Nedashkovskaya et al. 2010

Risk group: 1

• Synonyms:

  • Name	Kind
    "Microscilla tractuosa" Lewin 1969	homotypic synonym, not validly published, basonym of name in Approved Lists
    Marivirga tractuosa (Lewin 1969) Nedashkovskaya et al. 2010	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Flexibacter tractuosus 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 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 5 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 other species in the genus.

Parent taxon: Flexibacter Soriano 1945 (Approved Lists 1980)

Assigned by: Leadbetter ER. Genus II. Flexibacter Soriano 1945, 92, Lewin 1969, 192 emend. mut. char. In: Buchanan RE, N.e G (eds), Bergey's Manual of Determinative Bacteriology, 8th ed., The Williams & Wilkins Co, Baltimore, 1974, p. 105-107.

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.776302Copy to clipboardLink copied to clipboard

Record number: 776302

• Previous versions:

  • Version	Date	JSON
    1	2026-03-31