Name: Peptostreptococcus micros (Prévot 1933) Smith 1957 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Streptococcus micros" Prévot 1933

Etymology: mi’cros. N.L. masc. adj. micros, small, little [probably better: micrus]; from Gr. masc. adj. mikros, small (may keep -o)

Pronunciation, gender: … MI-kros, masculine

Type strain: ATCC 33270; CCUG 46357; CIP 105294; DSM 20468; GIFU 7824; JCM 12970; NCTC 11808; VPI 5464

Conduct genome-based taxonomy at

16S rRNA gene: AB729072 Analyse FASTA

Effective publication: Smith LDS. Genus V. Peptostreptococcus Kluyver and van Niel, 1936,. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co, Baltimore, 1957, p. 533-541.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

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

Correct name: Parvimonas micra (Prévot 1933) Tindall and Euzéby 2006

Risk group: 2

• Synonyms:

  • Name	Kind
    Peptococcus glycinophilus (Cardon and Barker 1946) Douglas 1957 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Micromonas micros (Prévot 1933) Murdoch and Shah 2000	homotypic synonym, inaccurate spelling and illegitimate
    Parvimonas micra (Prévot 1933) Tindall and Euzéby 2006	homotypic synonym, validly published under the ICNP
    "Streptococcus micros" Prévot 1933	homotypic synonym, not validly published, basonym of name in Approved Lists
    Micromonas micra corrig. (Prévot 1933) Murdoch and Shah 2000	homotypic synonym, validly published under the ICNP, illegitimate name
    "Diplococcus glycinophilus" Cardon and Barker 1946	heterotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • ⏰ According to Cato et al. (1983), this species is an earlier heterotypic synonym of "Diplococcus glycinophilus" Cardon and Barker 1946. Publication: Cato EP, Johnson JL, Hash DE, Holdeman LV. Synonymy of Peptococcus glycinophilus (Cardon and Barker 1946) Douglas 1957 with Peptostreptococcus micros (Prévot 1933) Smith 1957 and electrophoretic differentiation of Peptostreptococcus micros from Peptococcus magnus (Prévot 1933) Holdeman and Moore 1972. Int. J. Syst. Bacteriol. 1983; 33:207-210.
  • ⏰ According to Cato et al. (1983), this species is an earlier heterotypic synonym of Peptococcus glycinophilus (Cardon and Barker 1946) Douglas 1957 (Approved Lists 1980). Publication: Cato EP, Johnson JL, Hash DE, Holdeman LV. Synonymy of Peptococcus glycinophilus (Cardon and Barker 1946) Douglas 1957 with Peptostreptococcus micros (Prévot 1933) Smith 1957 and electrophoretic differentiation of Peptostreptococcus micros from Peptococcus magnus (Prévot 1933) Holdeman and Moore 1972. Int. J. Syst. Bacteriol. 1983; 33:207-210.
  • ❗ Peptostreptococcus micros 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 Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — 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 2023-10-29. The full classification is: risk group = 2, note = "ht". — 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 325 times 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.
  • 🧍 Replacement of the illegitimate name Micromonas micros (Prévot 1933) Murdoch and Shah 2000, which is illegitimate because it is placed in an illegitimate genus (see: Micromonas). Publication: Murdoch DA, Shah HN. Reclassification of Peptostreptococcus magnus (Prevot 1933) Holdeman and Moore 1972 as Finegoldia magna comb. nov. and Peptostreptococcus micros (Prevot 1933) Smith 1957 as Micromonas micros comb. nov. Anaerobe 1999; 5:555-559. 🇬🇧

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

Assigned by: Smith LDS. Genus V. Peptostreptococcus Kluyver and van Niel, 1936,. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co, Baltimore, 1957, p. 533-541.

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Record number: 779389