Name: Paenirhizobium Ma et al. 2025

Category: Genus

Proposed as: gen. nov.

Etymology: Pae.ni.rhi.zo’bi.um. L. adv. paene, almost; N.L. neut. n. Rhizobium, a bacterial generic name; N.L. neut. n. Paenirhizobium, almost Rhizobium

Gender, pronunciation (Latin): neuter (stem: Paenirhizobi-), pa͡e-ni-r^hi-ZO-bi-um

Type species: Paenirhizobium daejeonense (Quan et al. 2005) Ma et al. 2025

Effective publication: Ma T, Xue H, Piao C, Jiang N, Li Y. Phylogenomic reappraisal of the family Rhizobiaceae at the genus and species levels, including the description of Ectorhizobium quercum gen. nov., sp. nov. Front Microbiol 2023; 14:1207256. 🇨🇳

IJSEM list: Oren A, Göker M. Validation list no. 225. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2025; 75:6863.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Rhizobium Frank 1889 (Approved Lists 1980)

• Synonyms:

  • Name	Kind
    Velazquezella Naranjo-Robayo et al. 2026	heterotypic synonym, validly published under the ICNP
    Rhizobium Frank 1889 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP, conserved name
    Phytoamicus Van Lill et al. 2026	heterotypic synonym, validly published under the ICNP
    Limnomicrobium Naranjo-Robayo et al. 2026	heterotypic synonym, validly published under the ICNP
    Martinezella Naranjo-Robayo et al. 2026	heterotypic synonym, validly published under the ICNP
    Arminella Naranjo-Robayo et al. 2026	heterotypic synonym, validly published under the ICNP
    "Metarhizobium" Ma et al. 2023	heterotypic synonym, not validly published
    Peteryoungia Rahi et al. 2021	heterotypic synonym, validly published under the ICNP

• Notes:
  • 🚂 For the type species of this genus another name is in use, which is affiliated with the genus Rhizobium Frank 1889 (Approved Lists 1980). Publication: Quan ZX, Bae HS, Baek JH, Chen WF, Im WT, Lee ST. Rhizobium daejeonense sp. nov. isolated from a cyanide treatment bioreactor. Int J Syst Evol Microbiol 2005; 55:2543-2549. 🇰🇷
  • 😢 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. The phrase "validly described" is misleading. 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. 🇬🇧
  • ❗ Paenirhizobium is the correct name instead if this genus is regarded as a separate genus (i.e., if its nomenclatural type is not assigned to another genus whose name is validly published, legitimate and not rejected and has priority).
  • 🧬 The phylogenomic assignment score of this taxon is 0.09248 (N = 13).
  • 🎰 The BRCs most frequently used for deposits in this group are: NBRC: 3; CGMCC: 2; KCTC: 2; LMG: 2; DSM: 2; JCM: 2; KACC: 2; NRRL: 1; ATCC: 1; KEMB: 1.

Subdivision:

Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 4
Total number of child taxa: 6

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Paenirhizobium cremeum (Yang et al. 2022) Van Lill et al. 2026	validly published under the ICNP	synonym
    Paenirhizobium daejeonense (Quan et al. 2005) Ma et al. 2025	validly published under the ICNP	synonym
    Paenirhizobium naphthalenivorans (Kaiya et al. 2018) Ma et al. 2025	validly published under the ICNP	synonym
    Paenirhizobium selenitireducens (Hunter et al. 2008) Ma et al. 2025	validly published under the ICNP	synonym
    "Paenirhizobium sichuanensis" (Zhang et al. 2026) Van Lill et al. 2026	not validly published	synonym
    "Paenirhizobium terricola" (Dahal et al. 2023) Van Lill et al. 2026	not validly published	synonym

Parent taxon: Rhizobiaceae Conn 1938 (Approved Lists 1980)

Assigned by: Ma T, Xue H, Piao C, Jiang N, Li Y. Phylogenomic reappraisal of the family Rhizobiaceae at the genus and species levels, including the description of Ectorhizobium quercum gen. nov., sp. nov. Front Microbiol 2023; 14:1207256. 🇨🇳

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Record number: 67876

• Previous versions:

  • Version	Date	JSON
    1	2026-03-31