Name: Rhodocyclus tenuis (Pfennig 1969) Imhoff et al. 1984

Category: Species

Proposed as: comb. nov.

Basonym: Rhodospirillum tenue Pfennig 1969 (Approved Lists 1980)

Etymology: te’nu.is. L. masc. adj. tenuis, slender, thin

Pronunciation (Latin), gender: r^ho-do-KY-klus TE-nu-is, masculine

Type strain: 2761; ATCC 19137; ATCC 25093; DSM 109; Grunenplan; LMG 4367; NBRC 102472

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: D16208 Analyse FASTA

Valid publication: Imhoff JF, Trüper HG, Pfennig N. Rearrangement of the species and genera of the phototrophic "purple nonsulfur bacteria". Int. J. Syst. Bacteriol. 1984; 34:340-343. 🇩🇪

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Rhodospirillum tenue Pfennig 1969 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Emendations:
  • Kyndt et al. 2022 Kyndt JA, Aviles FA, Imhoff JF, Kunzel S, Neulinger SC, Meyer TE. Comparative Genome Analysis of the Photosynthetic Betaproteobacteria of the Genus Rhodocyclus: Heterogeneity within Strains Assigned to Rhodocyclus tenuis and Description of Rhodocyclus gracilis sp. nov. as a New Species. Microorganisms 2022; 10:0. 🇺🇸 Oren A, Göker M. List of changes in taxonomic opinion no. 37. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2023; 73:5696.

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.10532 (N = 4).
  • 😷 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 18 times in PubMed until 2026-06-11.

Parent taxon: Rhodocyclus Pfennig 1978 (Approved Lists 1980)

Assigned by: Imhoff JF, Trüper HG, Pfennig N. Rearrangement of the species and genera of the phototrophic "purple nonsulfur bacteria". Int. J. Syst. Bacteriol. 1984; 34:340-343. 🇩🇪

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Record number: 780484