Name: Thermoanaerobacter pseudethanolicus Onyenwoke et al. 2007

Category: Species

Proposed as: sp. nov.

Etymology: pseud.e.tha.no’li.cus. Gr. masc./fem. adj. pseudês, false; N.L. masc. adj. ethanolicus, a bacteria-specific epithet; N.L. masc. adj. pseudethanolicus, a false (Thermoanaerobacter) ethanolicus

Pronunciation (Latin), gender: t^her-mo-an-a-e-ro-BAK-ter pse͡ud-e-t^ha-NO-li-kus, masculine

Type strain: 39E; ATCC 33223; DSM 2355

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: L09164 Analyse FASTA

Valid publication: Onyenwoke RU, Kevbrin VV, Lysenko AM, Wiegel J. Thermoanaerobacter pseudethanolicus sp. nov., a thermophilic heterotrophic anaerobe from Yellowstone National Park. Int J Syst Evol Microbiol 2007; 57:2191-2193. 🇺🇸

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 57, part 10 of the IJSEM. Int J Syst Evol Microbiol 2008; 58:3-4.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Thermoanaerobacter brockii (Zeikus et al. 1983) Lee et al. 1993

Risk group: 1

• Synonyms:

  • Name	Kind
    Thermoanaerobacter brockii subsp. finnii (Schmid et al. 1986) Cayol et al. 1995	heterotypic synonym, validly published under the ICNP, distinct rank
    Thermoanaerobacter brockii (Zeikus et al. 1983) Lee et al. 1993	heterotypic synonym, validly published under the ICNP
    Thermoanaerobium brockii Zeikus et al. 1983	heterotypic synonym, validly published under the ICNP
    "Thermoanaerobacter pseudethanolicus subsp. finnii" (Schmid et al. 1986) Bing 2024	heterotypic synonym, not validly published, distinct rank
    Thermoanaerobacter brockii subsp. lactiethylicus Cayol et al. 1995	heterotypic synonym, validly published under the ICNP, distinct rank
    Thermoanaerobacter finnii Schmid et al. 1986	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏲ According to Bouras et al. (2026), this species is a later heterotypic synonym of Thermoanaerobacter brockii (Zeikus et al. 1983) Lee et al. 1993. Publication: Bouras N, Dif G, Belghit S, Nguyen SV, Jacobs JL, Toumatia O, Ebada SS, Nouioui I. Genome-based reclassification of the genus Thermoanaerobacter: taxonomic emendations and new combinations. Anaerobe 2026; 0:103027. 🇩🇿
  • ⏲ According to Bouras et al. (2026), this species is a later heterotypic synonym of Thermoanaerobium brockii Zeikus et al. 1983. Publication: Bouras N, Dif G, Belghit S, Nguyen SV, Jacobs JL, Toumatia O, Ebada SS, Nouioui I. Genome-based reclassification of the genus Thermoanaerobacter: taxonomic emendations and new combinations. Anaerobe 2026; 0:103027. 🇩🇿
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. List of changes in taxonomic opinion no. 44. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2026; 76:7140.
  • ❗ Thermoanaerobacter pseudethanolicus 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 Thermoanaerobacter.
  • 🧬 The phylogenomic assignment score of this taxon is 0.09309 (N = 10).
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 29 times in PubMed until 2026-06-11.

Subdivision:

Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 0
Total number of child taxa: 1

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    "Thermoanaerobacter pseudethanolicus subsp. finnii" (Schmid et al. 1986) Bing 2024	not validly published	synonym

Parent taxon: Thermoanaerobacter Wiegel and Ljungdahl 1982

Assigned by: Onyenwoke RU, Kevbrin VV, Lysenko AM, Wiegel J. Thermoanaerobacter pseudethanolicus sp. nov., a thermophilic heterotrophic anaerobe from Yellowstone National Park. Int J Syst Evol Microbiol 2007; 57:2191-2193. 🇺🇸

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.786782Copy to clipboardLink copied to clipboard

Record number: 786782

• Previous versions:

  • Version	Date	JSON
    1	2026-03-31