Name: Ammonifex degensii Huber and Stetter 1996

Category: Species

Proposed as: sp. nov.

Etymology: de.gen’si.i. N.L. gen. masc. n. degensii, of Degens, honoring Egon T. Degens

Pronunciation (Latin), gender: … de-GEN-si-i, masculine

Type strain: DSM 10501; KC4

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: U34975 Analyse FASTA

Effective publication: Huber R, Rossnagel P, Woese CR, Rachel R, Langworthy TA, Stetter KO. Formation of ammonium from nitrate during chemolithoautotrophic growth of the extremely thermophilic bacterium ammonifex degensii gen. nov. sp. nov. Syst Appl Microbiol 1996; 19:40-49. 🇩🇪

IJSEM list: Anonymous. Validation list no. 58. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1996; 46:836-837.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 🥇 Nomenclatural type of the genus Ammonifex Huber and Stetter 1996. Publication: Huber R, Rossnagel P, Woese CR, Rachel R, Langworthy TA, Stetter KO. Formation of ammonium from nitrate during chemolithoautotrophic growth of the extremely thermophilic bacterium ammonifex degensii gen. nov. sp. nov. Syst Appl Microbiol 1996; 19:40-49. 🇩🇪
  • ✏ The authority of the taxon name (Huber and Stetter) deliberately differs from the authors of the publication (Huber 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 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 4 times in PubMed until 2025-06-04.
  • 🧍 Complete authorship reads: Huber and Stetter 1996 in Huber, Rossnagel, Woese, Rachel, Langworthy and Stetter 1996.

Parent taxon: Ammonifex Huber and Stetter 1996

Assigned by: Huber R, Rossnagel P, Woese CR, Rachel R, Langworthy TA, Stetter KO. Formation of ammonium from nitrate during chemolithoautotrophic growth of the extremely thermophilic bacterium ammonifex degensii gen. nov. sp. nov. Syst Appl Microbiol 1996; 19:40-49. 🇩🇪

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Record number: 773164