Name: Nitrosospira multiformis (Watson et al. 1971) Head et al. 1995

Category: Species

Proposed as: comb. nov.

Basonym: Nitrosolobus multiformis Watson et al. 1971 (Approved Lists 1980)

Etymology: mul.ti.for’mis. L. fem. adj. multiformis, manyshaped, multiform

Pronunciation (Latin), gender: ni-tro-so-SPI-ra mul-ti-FOR-mis, feminine

Type strain: ATCC 25196; C-71; DSM 101674

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB070984 Analyse FASTA

Effective publication: Head IM, Hiorns WD, Embley TM, McCarthy AJ, Saunders JR. The phylogeny of autotrophic ammonia-oxidizing bacteria as determined by analysis of 16S ribosomal RNA gene sequences. J Gen Microbiol 1993; 139:1147-1153. 🇬🇧

IJSEM list: Anonymous. Validation list no. 54. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1995; 45:619-620.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Nitrosolobus multiformis Watson et al. 1971 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 😷 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 2026-08-13. 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 56 times in PubMed until 2026-06-11.

Parent taxon: Nitrosospira Winogradsky and Winogradsky 1933 (Approved Lists 1980)

Assigned by: Head IM, Hiorns WD, Embley TM, McCarthy AJ, Saunders JR. The phylogeny of autotrophic ammonia-oxidizing bacteria as determined by analysis of 16S ribosomal RNA gene sequences. J Gen Microbiol 1993; 139:1147-1153. 🇬🇧

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Record number: 784492