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16S rRNA RefSeq: V15.23    Genomic RefSeq: V10.1
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Parvimonas micra (HMT-111)
Taxon Description:
This species is known to be heterogeneous with micro-variation among 16S rRNA sequences including between operons within strains and phenotypic variation including colonial appearance [1].

Disease Associations:
Has been isolated from most types of oral infection. Is a particularly frequent isolate from acute dentoalveolar infections where it is often a member of the 15-20 species consortium associated with the condition. Has also been isolated from clinical specimens obtained from infections at other body sites primarily soft-tissue abscesses and bite wounds. These are primarily at sites above the diaphragm suggesting that the mouth is the primary habitat.

Prevalence and Source:
Parvimonas micra is a commonly found oral species and is isolated from dental plaque and the tongue in health and a variety of oral disease associated microbiota including periodontitis endodontic and dentoalveolar infections pericoronitis and advanced dental caries.
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Class: Tissierellia
Order: Tissierellales
Genus: Parvimonas
Species:Parvimonas micra
Status: Named - Cultured
Type/Reference Strain: ATCC 33270
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Former Names or Synonyms:
Diplococcus glycinophilus
Micromonas micros
Peptococcus glycinophilus
Peptostreptococcus micros
Phylum: Firmicutes
Streptococcus anaerobius
Streptococcus micros
16S rRNA Reference Sequences:    view in
RefSeq tree
RefSeq ID: 111BS044
RefSeq ID: 111FG014
RefSeq ID: 111_3523

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Genotypic Description:
Phenotypic Characteristics: Small (0.3 -0.7 micron diameter) Gram-positive cocci occurring in pairs and short chains [2]. Obligate anaerobe. Strains are asaccharolytic and the end-products of metabolism are primarily acetate with small amounts of lactate and sometimes succinate produced. The mol % G+C content of the DNA is 27-28.
Cultivability: Colonies on horse blood agar are around 1 mm in diameter circular entire opaque white or translucent gray and may be smooth or rough after 4 days anaerobic incubation.
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Microbial Ecology
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NCBI Taxon ID: 33033 [Link to NCBI]
PubMed Searches:
[NCBI PubMed Link]
[NCBI (Entrez) Nucleotide Link]
[NCBI (Entrez) Protein Link]
Number of
Genome Sequences:
12 See List
Phylogenetic Trees:
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[1] van Dalen PJ, van Steenbergen TJ, Cowan MM, Busscher HJ, de Graaff J. Description of two morphotypes of Peptostreptococcus micros. Int J Syst Bacteriol. 1993 Oct;43(4):787-93
[2] Holdeman Moore LV, Johnson JL, Moore, WEC. The genus Peptostreptococcus. Bergeys Manual of Systematic Bacteriology 1986; Vol. 2, pp. 1090-1091.