Name: Ochrobactrum rhizosphaerae Kämpfer et al. 2008

Category: Species

Proposed as: sp. nov.

Etymology: rhi.zo.sphae’rae. Gr. fem. n. rhiza, root; Gr. fem. n. sphaîra (gen. sphaîras), ball, any globe, sphere; N.L. gen. fem. n. rhizosphaerae, of the rhizosphere

Pronunciation, gender: r^hi-zo-SP^HA͡E-ra͡e, neuter

Type strain: CCM 7493; CCUG 55411; DSM 19824; PR17

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: MT760146 Analyse FASTA

Valid publication: Kampfer P, Sessitsch A, Schloter M, Huber B, Busse HJ, Scholz HC. Ochrobactrum rhizosphaerae sp. nov. and Ochrobactrum thiophenivorans sp. nov., isolated from the environment. Int J Syst Evol Microbiol 2008; 58:1426-1431.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 58, part 6 of the IJSEM. Int J Syst Evol Microbiol 2008; 58:1995-1996.

Nomenclatural status: validly published under the ICNP

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

Correct name: Brucella rhizosphaerae (Kämpfer et al. 2008) Hördt et al. 2020

Risk group: 1

• Synonyms:

  • Name	Kind
    Brucella rhizosphaerae (Kämpfer et al. 2008) Hördt et al. 2020	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Ochrobactrum rhizosphaerae 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 Ochrobactrum.
  • 😷 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 9 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.
  • 🧍 The phylogenetic position of this species was determined in a genome-scale analysis by Hördt et al. (2020). Publication: 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.

Parent taxon: Ochrobactrum Holmes et al. 1988

Assigned by: Kampfer P, Sessitsch A, Schloter M, Huber B, Busse HJ, Scholz HC. Ochrobactrum rhizosphaerae sp. nov. and Ochrobactrum thiophenivorans sp. nov., isolated from the environment. Int J Syst Evol Microbiol 2008; 58:1426-1431.

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Record number: 787385