Species Parvimonas micra

Name: Parvimonas micra (Prévot 1933) Tindall and Euzéby 2006

Category, proposed as: species, comb. nov.

Basonym: "Streptococcus micros" Prévot 1933

Etymology: mi’cra. Gr. masc. adj. mikros, small, little (may keep -o); N.L. fem. adj. micra, small, little

Pronunciation (Latin), gender: par-WI-mo-nas MI-kra, feminine

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

Valid publication: Tindall BJ, Euzeby JP. Proposal of Parvimonas gen. nov. and Quatrionicoccus gen. nov. as replacements for the illegitimate, prokaryotic, generic names Micromonas Murdoch and Shah 2000 and Quadricoccus Maszenan et al. 2002, respectively. Int J Syst Evol Microbiol 2006; 56:2711-2713. 🇩🇪

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 56, part 11 of the IJSEM. Int J Syst Evol Microbiol 2007; 57:199-200.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 2

• Synonyms:

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

• Notes:
  • 🥇 Nomenclatural type of the genus Parvimonas Tindall and Euzéby 2006. Publication: Tindall BJ, Euzeby JP. Proposal of Parvimonas gen. nov. and Quatrionicoccus gen. nov. as replacements for the illegitimate, prokaryotic, generic names Micromonas Murdoch and Shah 2000 and Quadricoccus Maszenan et al. 2002, respectively. Int J Syst Evol Microbiol 2006; 56:2711-2713. 🇩🇪
  • ⏰ 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. 🇺🇸
  • 😷 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 Germany has been imported on 2026-08-13. 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 534 times in PubMed until 2026-06-11.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as 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. 🇬🇧
  • 🧍 Replacement of the illegitimate Micromonas micros (Prévot 1933) Murdoch and Shah 2000, which is illegitimate because of precedence of the algal genus name, Micromonas I. Manton and M. Parke 1960 [Rule 51b(4)]. Consequently, a new species designation Parvimonas micra (Prévot 1933) Tindall and Euzéby 2006 has been proposed by Tindall and Euzéby 2006. 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: Parvimonas Tindall and Euzéby 2006

Assigned by: Tindall BJ, Euzeby JP. Proposal of Parvimonas gen. nov. and Quatrionicoccus gen. nov. as replacements for the illegitimate, prokaryotic, generic names Micromonas Murdoch and Shah 2000 and Quadricoccus Maszenan et al. 2002, respectively. Int J Syst Evol Microbiol 2006; 56:2711-2713. 🇩🇪

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Record number: 785693