Name: Megamonas hypermegale corrig. (Harrison and Hansen 1963) Shah and Collins 1983

Category: Species

Proposed as: comb. nov.

Basonym: Bacteroides hypermegas Harrison and Hansen 1963 (Approved Lists 1980)

Etymology: hy.per.me.ga’le. Gr. prep. hyper, over, more than; Gr. masc. adj. megas, megale mega, big; N.L. fem. adj. hypermegale, very big

Pronunciation, gender: hy-per-me-GA-le, feminine

Type strain: ATCC 25560; CCUG 5856; DSM 1672; LMG 3890; NCTC 10570

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ420107 Analyse FASTA

Effective publication: Shah HN, Collins MD. Reclassification of Bacteroides hypermegas (Harrison and Hansen) in a new genus Megamonas, as Megamonas hypermegas comb. nov. Zentralbl. Bakteriol. Parasitenkd. Infektionskr. Hyg. Abt. 1 Orig. 1982; C3:394-398.

IJSEM list: Anonymous. Validation list no. 10. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1983; 33:438-440.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Bacteroides hypermegas Harrison and Hansen 1963 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Megamonas hypermegas (Harrison and Hansen 1963) Shah and Collins 1983	other spelling of name, inaccurate spelling

• Notes:
  • 🥇 Nomenclatural type of the genus Megamonas Shah and Collins 1983. Publication: Shah HN, Collins MD. Reclassification of Bacteroides hypermegas (Harrison and Hansen) in a new genus Megamonas, as Megamonas hypermegas comb. nov. Zentralbl. Bakteriol. Parasitenkd. Infektionskr. Hyg. Abt. 1 Orig. 1982; C3:394-398.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1. — 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 14 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 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.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683.
  • 🧍 Nom. corrig.: IJSB 48:1073; Megamonas hypermegas (sic). Publication: Euzéby JP. Taxonomic note: necessary correction of specific and subspecific epithets according to Rules 12c and 13b of the International Code of Nomenclature of Bacteria (1990 Revision). Int. J. Syst. Bacteriol. 1998; 48:1073-1075.
  • 🧍 The original spelling of the specific epithet, hypermegas (sic), has been corrected by Euzéby 1998. Publication: Euzéby JP. Taxonomic note: necessary correction of specific and subspecific epithets according to Rules 12c and 13b of the International Code of Nomenclature of Bacteria (1990 Revision). Int. J. Syst. Bacteriol. 1998; 48:1073-1075.

Parent taxon: Megamonas Shah and Collins 1983

Assigned by: Shah HN, Collins MD. Reclassification of Bacteroides hypermegas (Harrison and Hansen) in a new genus Megamonas, as Megamonas hypermegas comb. nov. Zentralbl. Bakteriol. Parasitenkd. Infektionskr. Hyg. Abt. 1 Orig. 1982; C3:394-398.

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Record number: 777743