Name: Desulfurolobus ambivalens Zillig and Böck 1987

Category: Species

Proposed as: sp. nov.

Etymology: am.bi’va.lens. L. masc./neut. pl. adj. ambo, ambae, both; L. pres. part. valens, being able to do; N.L. masc. part. adj. ambivalens, ambivalent

Pronunciation (Latin), gender: de-sul-fu-RO-lo-bus am-BI-wa-lens, masculine

Type strain: CIP 104912; DSM 3772; JCM 9191; Lei 10

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: D85506 Analyse FASTA

Effective publication: Zillig W, Yeats S, Holz I, Bock A, Rettenberger M, Gropp F, Simon G. Desulfurolobus arnbivalens, gen. nov., sp. nov., an autotrophic archaebacterium facultatively oxidizing or reducing sulfur. Syst. Appl. Microbiol. 1986; 8:197-203. 🇩🇪

IJSEM list: Anonymous. Validation list no. 23. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1987; 37:179-180.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Acidianus ambivalens (Zillig and Böck 1987) Fuchs et al. 1996

Risk group: 1

• Synonyms:

  • Name	Kind
    Acidianus ambivalens (Zillig and Böck 1987) Fuchs et al. 1996	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Desulfurolobus Zillig and Böck 1987. Publication: Zillig W, Yeats S, Holz I, Bock A, Rettenberger M, Gropp F, Simon G. Desulfurolobus arnbivalens, gen. nov., sp. nov., an autotrophic archaebacterium facultatively oxidizing or reducing sulfur. Syst. Appl. Microbiol. 1986; 8:197-203. 🇩🇪
  • ❗ Desulfurolobus ambivalens 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 Desulfurolobus.
  • ✏ The authority of the taxon name (Zillig and Böck) deliberately differs from the authors of the publication (Zillig et al.).
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — 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 8 times in PubMed until 2026-06-11.
  • 🧍 The strain CIP 104912 is not available. — Bizet C. Personal communication, 2005-06-28.

Parent taxon: Desulfurolobus Zillig and Böck 1987

Assigned by: Zillig W, Yeats S, Holz I, Bock A, Rettenberger M, Gropp F, Simon G. Desulfurolobus arnbivalens, gen. nov., sp. nov., an autotrophic archaebacterium facultatively oxidizing or reducing sulfur. Syst. Appl. Microbiol. 1986; 8:197-203. 🇩🇪

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Record number: 775729