Species Peptostreptococcus magnus

Name: Peptostreptococcus magnus (Prévot 1933) Ezaki et al. 1983

Category, proposed as: species, comb. nov.

Basonym: "Diplococcus magnus" Prévot 1933

Etymology: ma’gnus. L. masc. adj. magnus, large

Pronunciation (Latin), gender: pep-to-strep-to-KOK-kus MA-n͡gnus, masculine

Type strain: ATCC 15794; CCUG 17636; DSM 20470; GIFU 7629; NCTC 11804

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF542227 Analyse FASTA

Valid publication: Ezaki T, Yamamoto N, Ninomiya K, Suzuki S, Yabuuchi E. Transfer of Peptococcus indolicus, Peptococcus asaccharolyticus, Peptococcus prevotii, and Peptococcus magnus to the genus Peptostreptococcus and proposal of Peptostreptococcus tetradius sp. nov. Int. J. Syst. Bacteriol. 1983; 33:683-698. 🇯🇵

Nomenclatural status: validly published under the ICNP

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

Correct name: Finegoldia magna (Prévot 1933) Murdoch and Shah 2000

Risk group: 2

• Synonyms:

  • Name	Kind
    "Diplococcus magnus" Prévot 1933	homotypic synonym, not validly published, basonym of name in Approved Lists
    Peptococcus magnus (Prévot 1933) Holdeman and Moore 1972 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Finegoldia magna (Prévot 1933) Murdoch and Shah 2000	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Peptostreptococcus magnus 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 = 2. — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 2. — 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 147 times in PubMed until 2026-06-11.
  • 🙅 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.
  • 🧍 According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0. 🇬🇧

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

Assigned by: Ezaki T, Yamamoto N, Ninomiya K, Suzuki S, Yabuuchi E. Transfer of Peptococcus indolicus, Peptococcus asaccharolyticus, Peptococcus prevotii, and Peptococcus magnus to the genus Peptostreptococcus and proposal of Peptostreptococcus tetradius sp. nov. Int. J. Syst. Bacteriol. 1983; 33:683-698. 🇯🇵

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Record number: 779388