Name: Caldicellulosiruptor kristjanssonii Bredholt et al. 1999

Category: Species

Proposed as: sp. nov.

Etymology: krist.jans.son’i.i. N.L. gen. masc. n. kristjanssonii, of Kristjansson, named after Jakob K. Kristjansson

Gender: masculine

Type strain: ATCC 700853; DSM 12137; I77R1B

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ004811 Analyse FASTA

Valid publication: Bredholt S, Sonne-Hansen J, Nielsen P, Mathrani IM, Ahring BK. Caldicellulosiruptor kristjanssonii sp. nov., a cellulolytic, extremely thermophilic, anaerobic bacterium. Int J Syst Bacteriol 1999; 49:991-996.

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 49, part 3 of the IJSB. Int J Syst Bacteriol 1999; 49:1327-1328.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006

Risk group: 1

• Synonyms:

  • Name	Kind
    Caldicellulosiruptor lactoaceticus Mladenovska et al. 1997	heterotypic synonym, validly published under the ICNP
    Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006	heterotypic synonym, validly published under the ICNP
    Thermoanaerobium acetigenum Nielsen et al. 1994	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏲ According to Habib et al. (2021), this species is a later heterotypic synonym of Thermoanaerobium acetigenum Nielsen et al. 1994. Publication: Habib N, Rao MPN, Xiao M, Jan SA, Li WJ. Genome-based reclassification of Caldicellulosiruptor lactoaceticus and Caldicellulosiruptor kristjanssonii as later heterotypic synonyms of Caldicellulosiruptor acetigenus. Int J Syst Evol Microbiol 2021; 71:4927.
  • ⏲ According to Habib et al. (2021), this species is a later heterotypic synonym of Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006. Publication: Habib N, Rao MPN, Xiao M, Jan SA, Li WJ. Genome-based reclassification of Caldicellulosiruptor lactoaceticus and Caldicellulosiruptor kristjanssonii as later heterotypic synonyms of Caldicellulosiruptor acetigenus. Int J Syst Evol Microbiol 2021; 71:4927.
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 71, part 8 of the IJSEM. Int J Syst Evol Microbiol 2021; 71:5057.
  • ❗ Caldicellulosiruptor kristjanssonii 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 Caldicellulosiruptor.
  • 🧬 The phylogenomic assignment score of this taxon is 0.29559 (N = 4).
  • 😷 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 5 times in PubMed until 2024-03-27.

Parent taxon: Caldicellulosiruptor Rainey et al. 1995

Assigned by: Bredholt S, Sonne-Hansen J, Nielsen P, Mathrani IM, Ahring BK. Caldicellulosiruptor kristjanssonii sp. nov., a cellulolytic, extremely thermophilic, anaerobic bacterium. Int J Syst Bacteriol 1999; 49:991-996.

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Record number: 774343