Name: Peptostreptococcus tetradius (ex Choukévitch 1911) Ezaki et al. 1983

Category: Species

Proposed as: sp. nov., nom. rev.

Etymology: te.tra.di.us. Gr. adj. tetradikos, consisting of four; N.L. masc. adj. tetradius, occurring in groups of four

Gender: masculine

Type strain: ATCC 35098; CCM 3634; CCUG 17637; CIP 103927; DSM 2951; GIFU 7672; JCM 1964; LMG 14264

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF542234 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

Correct name: Anaerococcus tetradius (Ezaki et al. 1983 ex Choukévitch 1911) Ezaki et al. 2001

Risk group: 2

• Synonyms:

  • Name	Kind
    Anaerococcus tetradius (Ezaki et al. 1983 ex Choukévitch 1911) Ezaki et al. 2001	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Peptostreptococcus tetradius 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 = "+".
  • 🎓 Name mentioned 4 times in PubMed until 2024-03-28.
  • 🧍 Basonym "Micrococcus tetragenus anaerobius"; synonym "Gaffkya anaerobius". Publication: Walker IC, Adkinson J. Study I: Studies on Staphylococcus Pyogenes Aureus, Albus and Citreus, and on Micrococcus Tetragenus and M. Catarrhalis. J Med Res 1917; 35:373-390.

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: 779396