Name: Methanocaldococcus jannaschii (Jones et al. 1984) Whitman 2002

Category: Species

Proposed as: comb. nov.

Basonym: Methanococcus jannaschii Jones et al. 1984

Etymology: jan.na’schi.i. N.L. gen. masc. n. jannaschii, of Jannasch, named for the marine microbiologist H.W. Jannasch

Pronunciation, gender: jan-NA-s͡hi-i, masculine

Type strain: ATCC 43067; CIP 104961; DSM 2661; JAL-1; JCM 10045; NBRC 100440; OCM 168

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB603516 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, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, 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
    "Methanocaldococcus jannaschii" (Jones et al. 1984) Boone et al. 1993	homotypic synonym, not validly published
    Methanococcus jannaschii Jones et al. 1984	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Methanocaldococcus Whitman 2002. 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. 🇺🇸
  • 😷 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 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 426 times in PubMed until 2025-06-04.
  • 🧍 According to Rules 27(3) and 30, this name is not validly published because the effective publication only documents deposit of the type strain in a single recognized culture collection. However, according to the Judicial Opinion 81, Methanocaldococcus jannaschii (Jones et al. 1984) Whitman 2002 is to be considered to be validly published. 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, second edition, vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria), Springer-Verlag, New York, 2001, p. 243-245. 🇺🇸

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Record number: 777838