Name: Methanocaldococcus fervens (Jeanthon et al. 1999) Whitman 2002

Category: Species

Proposed as: comb. nov.

Basonym: Methanococcus fervens Jeanthon et al. 1999

Etymology: fer’vens. L. masc. part. adj. fervens, boiling hot, glowing, burning, referring to its high growth temperature

Pronunciation (Latin), gender: … FER-wens, masculine

Type strain: AG86; DSM 4213; JCM 15782

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF056938 Analyse FASTA

Effective publication: Whitman WB. Genus I. Methanocaldococcus gen. nov. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 1 (The Archaea and the Deeply Branching and Phototrophic Bacteria), Springer, New York, 2001, p. 243-245. 🇺🇸

IJSEM list: Anonymous. Validation list no. 85. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2002; 52:685-690.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Methanococcus fervens Jeanthon et al. 1999	homotypic synonym, validly published under the ICNP

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.11451 (N = 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 3 times in PubMed until 2025-06-04.
  • 🧍 At the time of publication, the type strain was not deposited in two publicly accessible service collections in different countries, and Methanocaldococcus fervens (Jeanthon et al. 1999) Whitman 2002 was not validly published [Rules 27(3) and 30]. However, according to the Judicial Opinion 81, Methanocaldococcus fervens (Jeanthon et al. 1999) Whitman 2002 is now considered to be validly published, since deposit in a second culture collection in a different country has been documented. Publication: Euzeby JP, Tindall BJ. Status of strains that contravene Rules 27(3) and 30 of the Bacteriological Code. Request for an opinion. Int J Syst Evol Microbiol 2004; 54:293-301. 🇫🇷

Parent taxon: Methanocaldococcus Whitman 2002

Assigned by: Whitman WB. Genus I. Methanocaldococcus gen. nov. In: Boone DR, Castenholz RW, Garrity GM (eds), Bergey's Manual of Systematic Bacteriology, 2nd edn, vol. 1 (The Archaea and the Deeply Branching and Phototrophic Bacteria), Springer, New York, 2001, p. 243-245. 🇺🇸

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Record number: 777835