Name: Thermoanaerobium acetigenum Nielsen et al. 1994

Category: Species

Proposed as: sp. nov.

Etymology: a.ce.ti.ge.num. L. neut. n. acetum, vinegar; L. inf. v. genere, to produce; N.L. neut. adj. acetigenum, vinegar- or acetic acid-producing

Gender: neuter

Type strain: ATCC BAA-1149; DSM 7040; X6B

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AY772476 Analyse FASTA

Effective publication: Nielsen P, Mathrani IM, Ahring BK. Thermoanaerobium acetigenum spec. nov., a new anaerobic, extremely thermophilic, xylanolytic non-spore forming bacterium isolated from an Icelandic hot spring. Arch. Microbiol. 1993; 159:460-464.

IJSEM list: Anonymous. Validation list no. 49. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1994; 44:370-371.

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	homotypic synonym, validly published under the ICNP
    Caldicellulosiruptor kristjanssonii Bredholt et al. 1999	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Habib et al. (2021), this species is an earlier heterotypic synonym of Caldicellulosiruptor kristjanssonii Bredholt et al. 1999. 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 an earlier heterotypic synonym of Caldicellulosiruptor lactoaceticus Mladenovska et al. 1997. 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.
  • ❗ Thermoanaerobium acetigenum 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 Thermoanaerobium.
  • 😷 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 1 time in PubMed until 2024-03-27.
  • 🧍 According to Rule 37a, bacteriologists adhering to this proposal must change the name Thermoanaerobium to Thermoanaerobacter. The name Thermoanaerobium acetigenum has been effectively published in 1993 [2], and validly published in April 1994 (Validation List 49) [3]. Publication: Nielsen P, Mathrani IM, Ahring BK. Thermoanaerobium acetigenum spec. nov., a new anaerobic, extremely thermophilic, xylanolytic non-spore forming bacterium isolated from an Icelandic hot spring. Arch. Microbiol. 1993; 159:460-464.
  • 🧍 Of course, Thermoanaerobium acetigenum was not included in the study by Lee et al. 1993. According to Rule 37a, the name Thermoanaerobium must be changed to Thermoanaerobacter, and Thermoanaerobium acetigenum must be transferred to the genus Thermoanaerobacter or in another genus. Publication: Anonymous. Validation list no. 49. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1994; 44:370-371.

Parent taxon: Thermoanaerobium Zeikus et al. 1983

Assigned by: Nielsen P, Mathrani IM, Ahring BK. Thermoanaerobium acetigenum spec. nov., a new anaerobic, extremely thermophilic, xylanolytic non-spore forming bacterium isolated from an Icelandic hot spring. Arch. Microbiol. 1993; 159:460-464.

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Record number: 782530