Name: Pseudorhizobium Kimes et al. 2017

Category: Genus

Proposed as: gen. nov.

Etymology: Pseu.do.rhi.zo’bi.um. Gr. neut. adj. pseudes, false; N.L. neut. n. Pseudorhizobium, false Rhizobium

Gender, pronunciation (Latin): neuter (stem: Pseudorhizobi-), pse͡u-do-r^hi-ZO-bi-um

Type species: Pseudorhizobium pelagicum Kimes et al. 2017

Conduct genome-based taxonomy of genus at TYGS

16S rRNA gene: Analyse FASTA

Effective publication: Kimes NE, Lopez-Perez M, Flores-Felix JD, Ramirez-Bahena MH, Igual JM, Peix A, Rodriguez-Valera F, Velazquez E. Pseudorhizobium pelagicum gen. nov., sp. nov. isolated from a pelagic Mediterranean zone. Syst Appl Microbiol 2015; 38:293-299. 🇪🇸

IJSEM list: Oren A, Garrity GM. Validation list no. 177. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2017; 67:3140-3143.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

• Emendations:
  • Lassalle et al. 2021 Lassalle F, Dastgheib SMM, Zhao FJ, Zhang J, Verbarg S, Fruhling A, Brinkmann H, Osborne TH, Sikorski J, Balloux F, et al. Phylogenomics reveals the basis of adaptation of Pseudorhizobium species to extreme environments and supports a taxonomic revision of the genus. Syst Appl Microbiol 2021; 44:126165. 🇬🇧 Oren A, Garrity GM. List of changes in taxonomic opinion no. 34. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2021; 71:4816.
    Notes:
    • ⊕ Emendation accompanied by the proposal of 5 new species in the genus.

• Notes:
  • 🙄 This taxon name is occasionally misprinted (or affected by an OCR error) in some sources as: "Pseudohizobium"; "Pseudorrhizobium".
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: de Lajudie P, Young JPW. International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Rhizobia and Agrobacteria Minutes of the closed meeting by videoconference, 17 July 2019. Int J Syst Evol Microbiol 2020; 70:3563-3571. 🇫🇷
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Mousavi SA, Young JPW. International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Rhizobia and Agrobacteria. Minutes of the closed annual meeting: videoconference on 11 October 2022 followed by online discussion until 31 December 2022. Int J Syst Evol Microbiol 2023; 73:5856. 🇬🇧
  • 🧔 This taxon was discussed in a meeting of a Taxonomic Subcommittee of the ICSP. Publication: Mousavi SA, Young JPW. International committee on systematics of prokaryotes subcommittee on the taxonomy of rhizobia and agrobacteria: Minutes of the 2025 closed annual meeting. Int J Syst Evol Microbiol 2026; 76:7149. 🇫🇮
  • 😢 The terminology used by the authors is in line with many other taxonomic studies and does not negatively affect their main results; some improvements may nevertheless be possible. Contrasting the term "chemotaxonomic" with "phenotypic" is not recommended. Using the term "phylogenetic data" (or equivalent) for sequence data is not advocated. See the LPSN phylogeny page for details. Publication: Göker M. What can genome analysis offer for bacteria? In: Bridge P, Smith D, Stackebrandt E (eds), Trends in the systematics of bacteria and fungi, CAB International, Wallingford, 2021, p. 255-281. 🇬🇧
  • 🎰 The BRCs most frequently used for deposits in this group are: DSM: 4; JCM: 4; CCTCC: 3; KEMC: 2; NRRL: 1; CECT: 1; KACC: 1; CFBP: 1; TRM: 1; CCUG: 1.

Subdivision:

Number of child taxa with a validly published and correct name: 7
Number of child taxa with a validly published name, including synonyms: 8
Total number of child taxa: 9

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Pseudorhizobium banfieldiae Lassalle et al. 2021	validly published under the ICNP	correct name
    Pseudorhizobium endolithicum (Parag et al. 2014) Lassalle et al. 2021	validly published under the ICNP	correct name
    Pseudorhizobium flavum (Gu et al. 2014) Lassalle et al. 2021	validly published under the ICNP	correct name
    "Pseudorhizobium halophilum" (Shen et al. 2026) Van Lill et al. 2026	not validly published	synonym
    Pseudorhizobium halotolerans Lassalle et al. 2021	validly published under the ICNP	synonym
    Pseudorhizobium marinum (Liu et al. 2015) Lassalle et al. 2021	validly published under the ICNP	correct name
    Pseudorhizobium pelagicum Kimes et al. 2017	validly published under the ICNP	correct name
    Pseudorhizobium tarimense (Turdahon et al. 2013) Kuzmanović et al. 2022	validly published under the ICNP	correct name
    Pseudorhizobium xiangyangii (Pan et al. 2022) Sbissi et al. 2025	validly published under the ICNP	correct name

Parent taxon: Rhizobiaceae Conn 1938 (Approved Lists 1980)

Assigned by: Kimes NE, Lopez-Perez M, Flores-Felix JD, Ramirez-Bahena MH, Igual JM, Peix A, Rodriguez-Valera F, Velazquez E. Pseudorhizobium pelagicum gen. nov., sp. nov. isolated from a pelagic Mediterranean zone. Syst Appl Microbiol 2015; 38:293-299. 🇪🇸

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Record number: 519243