Species Ruminococcus gnavus

Name: Ruminococcus gnavus Moore et al. 1976 (Approved Lists 1980)

Category, proposed as: species, sp. nov.

Etymology: gna’vus. L. masc. adj. gnavus, busy, active

Pronunciation (Latin), gender: ru-mi-no-KOK-kus N͡GNA-wus, masculine

Type strain: ATCC 29149; JCM 6515; VPI C7-9

Conduct genome-based taxonomy at

16S rRNA gene: AB910745 Analyse FASTA

Effective publication: Moore WEC, Johnson JL, Holdeman LV. Emendation of Bacteriodaceae and Butyrivibrio and descriptions of Desulfomonas gen. nov. and ten new species in the genera Desulfomonas, Butyrivibrio, Eubacterium, Clostridium, and Ruminococcus. International Journal of Systematic Bacteriology 1976; 26:238-252.

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: Mediterraneibacter gnavus (Moore et al. 1976) Togo et al. 2023

Risk group: 1

• Synonyms:

  • Name	Kind
    Mediterraneibacter gnavus (Moore et al. 1976) Togo et al. 2023	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Ruminococcus gnavus 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 Ruminococcus.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — 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 2026-08-13. 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 602 times in PubMed until 2026-06-11.
  • 🙅 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 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. 🇬🇧
  • 🧍 According to Ludwig et al. (2021), this "species affiliates away from its type species and may be reclassified as a new genus". Publication: Ludwig W, Viver T, Westram R, Francisco Gago J, Bustos-Caparros E, Knittel K, Amann R, Rossello-Mora R. Release LTP_12_2020, featuring a new ARB alignment and improved 16S rRNA tree for prokaryotic type strains. Syst Appl Microbiol 2021; 44:126218. 🇪🇸

Parent taxon: Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)

Assigned by: Moore WEC, Johnson JL, Holdeman LV. Emendation of Bacteriodaceae and Butyrivibrio and descriptions of Desulfomonas gen. nov. and ten new species in the genera Desulfomonas, Butyrivibrio, Eubacterium, Clostridium, and Ruminococcus. International Journal of Systematic Bacteriology 1976; 26:238-252.

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Record number: 784836