Name: Caulobacter henricii Poindexter 1964 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: hen.ri’ci.i. N.L. gen. masc. n. henricii, of Henrici, named for A.T. Henrici, who observed stalked bacteria on slides that had been submerged in freshwater

Pronunciation (Latin), gender: ka͡u-lo-BAK-ter hen-RI-ki-i, masculine

Type strain: ATCC 15253; CCUG 49339; CIP 106446; DSM 4730; LMG 18392; VKM B-1495

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ227758 Analyse FASTA

Effective publication: Poindexter JS. BIOLOGICAL PROPERTIES AND CLASSIFICATION OF THE CAULOBACTER GROUP. Bacteriol Rev 1964; 28:231-295.

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: correct name

Risk group: 1

• Emendations:
  • Hördt et al. 2020 Hordt A, Lopez MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, Gronow S, Kyrpides NC, Woyke T, Goker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria. Front Microbiol 2020; 11:468. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 32. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2020; 70:4061-4090.

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.16831 (N = 4).
  • 😷 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 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 13 times in PubMed until 2026-06-11.

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
    "Caulobacter henricii subsp. aurantiacus" Poindexter 1964	not validly published	preferred name

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

Assigned by: Poindexter JS. BIOLOGICAL PROPERTIES AND CLASSIFICATION OF THE CAULOBACTER GROUP. Bacteriol Rev 1964; 28:231-295.

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Record number: 774527