Name: Methylobacterium extorquens (Urakami and Komagata 1984 ex Bassalik 1913) Bousfield and Green 1985

Category: Species

Proposed as: comb. nov.

Basonym: Protomonas extorquens (ex Bassalik 1913) Urakami and Komagata 1984

Etymology: ex.tor’quens. L. neut. part. adj. extorquens, twisting out

Pronunciation, gender: ex-TOR-kwens, neuter

Type strain: ATCC 43645; CCUG 2084; DSM 1337; IAM 12631; IFO 15687; JCM 2802; NBRC 15687; NCCB 78015; NCIB 9399; NCIMB 9399; TK 0001; VKM B-2064

Conduct genome-based taxonomy at

16S rRNA gene: AB175632 Analyse FASTA

Valid publication: Bousfield IJ, Green PN. Reclassification of bacteria of the genus Protomonas Urakami and Komagata 1984 in the genus Methylobacterium (Patt, Cole, and Hanson) emend. Green and Bousfield 1983. Int. J. Syst. Bacteriol. 1985; 35:209.

Nomenclatural status: validly published under the ICNP

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

Correct name: Methylorubrum extorquens (Urakami and Komagata 1984 ex Bassalik 1913) Green and Ardley 2018

Risk group: 1

• Synonyms:

  • Name	Kind
    Methylorubrum extorquens (Urakami and Komagata 1984 ex Bassalik 1913) Green and Ardley 2018	homotypic synonym, validly published under the ICNP
    Protomonas extorquens (ex Bassalik 1913) Urakami and Komagata 1984	homotypic synonym, validly published under the ICNP, illegitimate name

• Emendations:
  • Kato et al. 2008 Kato Y, Asahara M, Goto K, Kasai H, Yokota A. Methylobacterium persicinum sp. nov., Methylobacterium komagatae sp. nov., Methylobacterium brachiatum sp. nov., Methylobacterium tardum sp. nov. and Methylobacterium gregans sp. nov., isolated from freshwater. Int J Syst Evol Microbiol 2008; 58:1134-1141. Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 58, part 5 of the IJSEM. Int J Syst Evol Microbiol 2008; 58:1783-1784.

• Notes:
  • ⏰ According to Alessa et al. (2021), this species is not an earlier heterotypic synonym of Methylobacterium chloromethanicum McDonald et al. 2001. Publication: Alessa O, Ogura Y, Fujitani Y, Takami H, Hayashi T, Sahin N, Tani A. Comprehensive Comparative Genomics and Phenotyping of Methylobacterium Species. Front Microbiol 2021; 12:740610.
  • ⏰ According to Alessa et al. (2021), this species is not an earlier heterotypic synonym of Methylobacterium dichloromethanicum Doronina et al. 2000. Publication: Alessa O, Ogura Y, Fujitani Y, Takami H, Hayashi T, Sahin N, Tani A. Comprehensive Comparative Genomics and Phenotyping of Methylobacterium Species. Front Microbiol 2021; 12:740610.
  • ⏰ According to Kato et al. (2005), this species is an earlier heterotypic synonym of Methylobacterium chloromethanicum McDonald et al. 2001. Publication: Kato Y, Asahara M, Arai D, Goto K, Yokota A. Reclassification of Methylobacterium chloromethanicum and Methylobacterium dichloromethanicum as later subjective synonyms of Methylobacterium extorquens and of Methylobacterium lusitanum as a later subjective synonym of Methylobacterium rhodesianum. J Gen Appl Microbiol 2005; 51:287-299.
  • ⏰ According to Kato et al. (2005), this species is an earlier heterotypic synonym of Methylobacterium dichloromethanicum Doronina et al. 2000. Publication: Kato Y, Asahara M, Arai D, Goto K, Yokota A. Reclassification of Methylobacterium chloromethanicum and Methylobacterium dichloromethanicum as later subjective synonyms of Methylobacterium extorquens and of Methylobacterium lusitanum as a later subjective synonym of Methylobacterium rhodesianum. J Gen Appl Microbiol 2005; 51:287-299.
  • ❗ Methylobacterium extorquens 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 Methylobacterium.
  • 😷 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 407 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.

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: 3

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Methylobacterium extorquens subsp. chloromethanicum" (McDonald et al. 2001) Alessa et al. 2021	not validly published	synonym
    "Methylobacterium extorquens subsp. dichloromethanicum" (Doronina et al. 2000) Alessa et al. 2021	not validly published	synonym
    "Methylobacterium extorquens subsp. extorquens" (Urakami and Komagata 1984 ex Bassalik 1913) Alessa et al. 2021	not validly published	orphaned subspecies

Parent taxon: Methylobacterium Patt et al. 1976 (Approved Lists 1980)

Assigned by: Bousfield IJ, Green PN. Reclassification of bacteria of the genus Protomonas Urakami and Komagata 1984 in the genus Methylobacterium (Patt, Cole, and Hanson) emend. Green and Bousfield 1983. Int. J. Syst. Bacteriol. 1985; 35:209.

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Record number: 777972