Name: "Candidatus Nitrososphaera viennensis" Tourna et al. 2011

Category: Species

Proposed as: Candidatus

Etymology: vi.en.nen’sis. N.L. fem. adj. viennensis, from Vienna, where the type strain was isolated

Pronunciation (Latin), gender: … wi-en-NEN-sis, feminine

Nomenclatural type: DSM 26422; EN76; JCM 19564; JMC 19564

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: FR773157 Analyse FASTA

Effective publication: Tourna M, Stieglmeier M, Spang A, Konneke M, Schintlmeister A, Urich T, Engel M, Schloter M, Wagner M, Richter A, et al. Nitrososphaera viennensis, an ammonia oxidizing archaeon from soil. Proc Natl Acad Sci U S A 2011; 108:8420-8425. 🇦🇹

IJSEM list: Oren A, Garrity GM, Parker CT, Chuvochina M, Trujillo ME. Candidatus list no. 1. Lists of names of prokaryotic Candidatus taxa. Int J Syst Evol Microbiol 2020; 70:3956-4042.

Nomenclatural status: not validly published

Nomenclatural pro-status: pro-validly published under the ICNP

Taxonomic status: synonym

Correct name: Nitrososphaera viennensis Stieglmeier et al. 2014

Risk group: 1

• Synonyms:

  • Name	Kind
    Nitrososphaera viennensis Stieglmeier et al. 2014	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus "Candidatus Nitrososphaera" Tourna et al. 2011. Publication: Tourna M, Stieglmeier M, Spang A, Konneke M, Schintlmeister A, Urich T, Engel M, Schloter M, Wagner M, Richter A, et al. Nitrososphaera viennensis, an ammonia oxidizing archaeon from soil. Proc Natl Acad Sci U S A 2011; 108:8420-8425. 🇦🇹
  • ❗ "Candidatus Nitrososphaera viennensis" is the pro-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 and legitimate or pro-validly published and pro-legitimate and not rejected and has priority or pro-priority) within a separate genus "Candidatus Nitrososphaera".
  • 😷 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.
  • 🧍 This species was confirmed as the type species of its monotypic genus in Appendix 1 of Candidatus List No. 6.

Parent taxon: "Candidatus Nitrososphaera" Tourna et al. 2011

Assigned by: Tourna M, Stieglmeier M, Spang A, Konneke M, Schintlmeister A, Urich T, Engel M, Schloter M, Wagner M, Richter A, et al. Nitrososphaera viennensis, an ammonia oxidizing archaeon from soil. Proc Natl Acad Sci U S A 2011; 108:8420-8425. 🇦🇹

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Record number: 4585