Name: Peptostreptococcus hydrogenalis Ezaki et al. 1990

Category: Species

Proposed as: sp. nov.

Etymology: hy.dro.ge.na’lis. N.L. neut. n. hydrogenum, hydrogen (that which produces water, so called because it forms water when exposed to oxygen); from Gr. neut. n. hydôr, water; from Gr. ind. v. gennaô, to produce; L. masc./fem. adj. suff. -alis, suffix used with the sense of pertaining to; N.L. masc. adj. hydrogenalis, pertaining to hydrogen, because this organism produces hydrogen

Pronunciation (Latin), gender: … hy-dro-ge-NA-lis, masculine

Type strain: ATCC 49630; DSM 7454; GIFU 7662; JCM 7635

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB538433 Analyse FASTA

Valid publication: Ezaki T, Liu SL, Hashimoto Y, Yabuuchi E. Peptostreptococcus hydrogenalis sp. nov. from human fecal and vaginal flora. Int J Syst Bacteriol 1990; 40:305-306. 🇯🇵

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Anaerococcus hydrogenalis (Ezaki et al. 1990) Ezaki et al. 2001

Risk group: 2

• Synonyms:

  • Name	Kind
    Anaerococcus hydrogenalis (Ezaki et al. 1990) Ezaki et al. 2001	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Peptostreptococcus hydrogenalis 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 Peptostreptococcus.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1, note = "PIIC". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1, note = "+". — 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 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.

Parent taxon: Peptostreptococcus Kluyver and van Niel 1936 (Approved Lists 1980)

Assigned by: Ezaki T, Liu SL, Hashimoto Y, Yabuuchi E. Peptostreptococcus hydrogenalis sp. nov. from human fecal and vaginal flora. Int J Syst Bacteriol 1990; 40:305-306. 🇯🇵

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Record number: 779383