Name: Caulobacter variabilis (ex Poindexter 1964) Poindexter 1989

Category: Species

Proposed as: sp. nov., nom. rev.

Etymology: va.ri.a’bi.lis. L. masc. adj. variabilis, changeable, variable

Pronunciation (Latin), gender: … wa-ri-A-bi-lis, masculine

Type strain: ATCC 15255; CB 17; DSM 4737

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ227783 Analyse FASTA

Effective publication: Poindexter JS. Genus Caulobacter Henrici and Johnson 1935, 83AL. In: Staley JT, Bryant MP, Pfennig N, Holt JG (eds), Bergey's manual of systematic bacteriology, vol. 3., The Williams & Wilkins Co., Baltimore, 1989, p. 1924-1939.

IJSEM list: Anonymous. Validation list no. 31. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1989; 39:495-497.

Nomenclatural status: validly published under the ICNP

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

Correct name: Brevundimonas variabilis (Poindexter 1989 ex Poindexter 1964) Abraham et al. 1999

Risk group: 1

• Synonyms:

  • Name	Kind
    "Caulobacter variabilis" Poindexter 1964	homotypic synonym, not validly published
    Brevundimonas variabilis (Poindexter 1989 ex Poindexter 1964) Abraham et al. 1999	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Caulobacter variabilis 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 Caulobacter.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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 2023-10-29. 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 2 times in PubMed until 2025-06-04.
  • 🙅 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.

Parent taxon: Caulobacter Henrici and Johnson 1935 (Approved Lists 1980)

Assigned by: Poindexter JS. Genus Caulobacter Henrici and Johnson 1935, 83AL. In: Staley JT, Bryant MP, Pfennig N, Holt JG (eds), Bergey's manual of systematic bacteriology, vol. 3., The Williams & Wilkins Co., Baltimore, 1989, p. 1924-1939.

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Record number: 774537