Name: Flexibacter roseolus Lewin 1969 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: ro.se’o.lus. L. masc. adj. roseus, rose-colored; L. masc. suff. -olus, diminutive ending; N.L. masc. adj. roseolus, intended to mean with a rosy tinge

Gender: masculine

Type strain: ATCC 23088; CIP 106406; DSM 9546; IFO 16707; LMG 13856; NBRC 16707

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB078063 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: Hugenholtzia roseola (Lewin 1969) Hahnke et al. 2017

Risk group: 1

• Synonyms:

  • Name	Kind
    Hugenholtzia roseola (Lewin 1969) Hahnke et al. 2017	homotypic synonym, validly published under the ICNP

• Emendations:
  • Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.

• Notes:
  • ❗ Flexibacter roseolus 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 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 other species in the genus.

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: 776298