Name: Ensifer fredii (Scholla and Elkan 1984) Young 2003

Category: Species

Proposed as: comb. nov.

Basonym: Rhizobium fredii Scholla and Elkan 1984

Etymology: fre’di.i. N.L. gen. masc. n. fredii, of Fred, named after of E.B. Fred

Pronunciation, gender: FRE-di-i, masculine

Type strain: ATCC 35423; CCUG 27877; DSM 5851; HAMBI 2075; ICMP 11139; IFO 14780; JCM 20967; LMG 6217; NBRC 14780; NRRL B-14241; NRRL B-14594; PRC 205; USDA 205

Conduct genome-based taxonomy at

16S rRNA gene: D14516 Analyse FASTA

Valid publication: Young JM. The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int J Syst Evol Microbiol 2003; 53:2107-2110. 🇳🇿

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 6 of the IJSEM. Int J Syst Evol Microbiol 2004; 54:309-311.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Sinorhizobium xinjiangensis Chen et al. 1988	heterotypic synonym, inaccurate spelling
    Sinorhizobium xinjiangense corrig. Chen et al. 1988	heterotypic synonym, validly published under the ICNP
    Rhizobium fredii Scholla and Elkan 1984	homotypic synonym, validly published under the ICNP
    Sinorhizobium fredii (Scholla and Elkan 1984) Chen et al. 1988	homotypic synonym, validly published under the ICNP
    Ensifer xinjiangensis (Chen et al. 1988) Young 2003	heterotypic synonym, validly published under the ICNP

• 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. 🇩🇪
    Notes:
    • 🧍 As of 2020-04-15 this emendation was not yet included in an IJSEM List of Changes in Taxonomic Opinion.

• Notes:
  • ⏰ According to Martens et al. (2008), this species is an earlier heterotypic synonym of Ensifer xinjiangensis (Chen et al. 1988) Young 2003. Publication: Martens M, Dawyndt P, Coopman R, Gillis M, De Vos P, Willems A. Advantages of multilocus sequence analysis for taxonomic studies: a case study using 10 housekeeping genes in the genus Ensifer (including former Sinorhizobium). Int J Syst Evol Microbiol 2008; 58:200-214. 🇧🇪
  • ⏰ According to Martens et al. (2008), this species is an earlier heterotypic synonym of Sinorhizobium xinjiangense corrig. Chen et al. 1988. Publication: Martens M, Dawyndt P, Coopman R, Gillis M, De Vos P, Willems A. Advantages of multilocus sequence analysis for taxonomic studies: a case study using 10 housekeeping genes in the genus Ensifer (including former Sinorhizobium). Int J Syst Evol Microbiol 2008; 58:200-214. 🇧🇪
  • ⏰ According to Martens et al. (2008), this species is an earlier heterotypic synonym of Sinorhizobium xinjiangensis Chen et al. 1988. Publication: Martens M, Dawyndt P, Coopman R, Gillis M, De Vos P, Willems A. Advantages of multilocus sequence analysis for taxonomic studies: a case study using 10 housekeeping genes in the genus Ensifer (including former Sinorhizobium). Int J Syst Evol Microbiol 2008; 58:200-214. 🇧🇪
  • 🧬 The phylogenomic assignment score of this taxon is 0.02426 (N = 17).
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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 28 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 pathogenicity of other species in the genus.

Parent taxon: Ensifer Casida 1982

Assigned by: Young JM. The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int J Syst Evol Microbiol 2003; 53:2107-2110. 🇳🇿

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Record number: 775921