Name: Pyrococcus horikoshii González et al. 1999

Category: Species

Proposed as: sp. nov.

Etymology: ho.ri.ko’shi.i. N.L. gen. masc. n. horikoshii, of Horikoshi, named to honor Dr.K. Horikoshi

Pronunciation, gender: ho-ri-KO-s͡hi-i, masculine

Type strain: ATCC 700860; DSM 12428; JA-1; JCM 9974; NBRC 100139; OT-3

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: D87344 Analyse FASTA

Effective publication: Gonzalez JM, Masuchi Y, Robb FT, Ammerman JW, Maeder DL, Yanagibayashi M, Tamaoka J, Kato C. Pyrococcus horikoshii sp. nov., a hyperthermophilic archaeon isolated from a hydrothermal vent at the Okinawa Trough. Extremophiles 1998; 2:123-130.

IJSEM list: Anonymous. Validation list no. 71. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1999; 49:1325-1326.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Notes:
  • 😷 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 556 times in PubMed until 2025-06-04.
  • 🧍 Complete authorship reads: González, Robb and Kato 1999 in González, Masuchi, Robb, Ammerman, Maeder, Yanagibayashi, Tamaoka and Kato 1998.
  • 🧍 The name Pyrococcus horikoshii must be attributed to González, Robb and Kato 1999 (in González, Masuchi, Robb, Ammermann, Maeder, Yanagibayashi, Tamaoka and Kato) not to González et al. 1999 as cited in Validation List no. 71. — 🧍 The type strain of Pyrococcus horikoshii González et al. 1999 is not "JA-1 JCM 9974" as stated in the Validation List no. 71, but simply JCM 9974. Publication: Stetter KO, Huber H. Genus II. Pyrococcus Fiala and Stetter 1986b, 573VP (Effective publication Fiala and Stetter 1986a, 60). 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. 346-348.
  • 🧍 The type strain of Pyrococcus horikoshii González et al. 1999 is not "JA-1 = JCM 9974" as stated in the Validation List no. 71, but simply JCM 9974. Publication: . Erratum. Int. J. Syst. Evol. Microbiol. 2000; 50:1411.

Parent taxon: Pyrococcus Fiala and Stetter 1986

Assigned by: Gonzalez JM, Masuchi Y, Robb FT, Ammerman JW, Maeder DL, Yanagibayashi M, Tamaoka J, Kato C. Pyrococcus horikoshii sp. nov., a hyperthermophilic archaeon isolated from a hydrothermal vent at the Okinawa Trough. Extremophiles 1998; 2:123-130.

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Record number: 780279