Name: Megasphaera micronuciformis Marchandin et al. 2003

Category: Species

Proposed as: sp. nov.

Etymology: mi.cro.nu.ci.for’mis. N.L. masc. adj. micros, small [probably better: micrus]; L. gen. fem. n. nucis, of a nut; L. masc./fem. adj. suff. -formis, shape or form; N.L. fem. adj. micronuciformis, small walnut-shaped, referring to the morphology of bacterial cells and cell surface

Pronunciation, gender: mi-kro-nu-ki-FOR-mis, feminine

Type strain: AIP 412.00; CCUG 45952; CIP 107280; DSM 17226; NCTC 13871

See detailed strain information at

16S rRNA gene: AF473834 Analyse FASTA

Valid publication: Marchandin H, Jumas-Bilak E, Gay B, Teyssier C, Jean-Pierre H, de Buochberg MS, Carriere C, Carlier JP. Phylogenetic analysis of some Sporomusa sub-branch members isolated from human clinical specimens: description of Megasphaera micronuciformis sp. nov. Int J Syst Evol Microbiol 2003; 53:547-553.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 2 of the IJSEM. Int J Syst Evol Microbiol 2003; 53:939-940.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Notes:
  • 😷 The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1, note = "+". — 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 16 times in PubMed until 2025-06-04.
  • 🙆 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 pathogenicity of the species itself.
  • 🧍 According to Bartlett et al. (2022), this species is a putative 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.
  • 🧍 In the Tables of Contents (IJSEM, 2003, 53, part 2, page I) and in the file "Author Index" (IJSEM, 2003, 53, part 2, page V), the author's name M. Siméon de Buochberg is erroneously cited as M.S. de Buochberg. — The correct etymology of the specific epithet should be Gr. adj. micros, small; L. fem. gen. n. nucis (not nuci as cited in the paper by Marchandin et al. 2003), a nut; L. adj. suffix -formis -is -e (from L. n. forma, figure, shape, appearance), -like, in the shape of; N.L. fem. adj. micronuciformis, small walnut-shaped. Publication: Euzeby JP. List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int J Syst Bacteriol 1997; 47:590-592.

Parent taxon: Megasphaera Rogosa 1971 (Approved Lists 1980)

Assigned by: Marchandin H, Jumas-Bilak E, Gay B, Teyssier C, Jean-Pierre H, de Buochberg MS, Carriere C, Carlier JP. Phylogenetic analysis of some Sporomusa sub-branch members isolated from human clinical specimens: description of Megasphaera micronuciformis sp. nov. Int J Syst Evol Microbiol 2003; 53:547-553.

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Record number: 777747