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

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: … eks-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: Green PN, Ardley JK. Review of the genus Methylobacterium and closely related organisms: a proposal that some Methylobacterium species be reclassified into a new genus, Methylorubrum gen. nov. Int J Syst Evol Microbiol 2018; 68:2727-2748. 🇦🇺

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 68, part 9 of the IJSEM. Int J Syst Evol Microbiol 2018; 68:3685-3687.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

• Synonyms:

  • Name	Kind
    Methylobacterium extorquens (Urakami and Komagata 1984 ex Bassalik 1913) Bousfield and Green 1985	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:
  • 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:
  • 🥇 Nomenclatural type of the genus Methylorubrum Green and Ardley 2018. Publication: Green PN, Ardley JK. Review of the genus Methylobacterium and closely related organisms: a proposal that some Methylobacterium species be reclassified into a new genus, Methylorubrum gen. nov. Int J Syst Evol Microbiol 2018; 68:2727-2748. 🇦🇺
  • ⏰ 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. 🇯🇵
  • 🎓 Name mentioned 78 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.

Parent taxon: Methylorubrum Green and Ardley 2018

Assigned by: Green PN, Ardley JK. Review of the genus Methylobacterium and closely related organisms: a proposal that some Methylobacterium species be reclassified into a new genus, Methylorubrum gen. nov. Int J Syst Evol Microbiol 2018; 68:2727-2748. 🇦🇺

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Record number: 798433