Name: Ruminococcus flavefaciens Sijpesteijn 1948 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: fla.ve.fa’ci.ens. L. masc. adj. flavus, yellow; L. pres. part. faciens, producing; N.L. masc. part. adj. flavefaciens, yellow-producing [probably better: flavifaciens]

Pronunciation (Latin), gender: … fla-we-FA-ki-ens, masculine

Type strain: ATCC 19208

Conduct genome-based taxonomy at

16S rRNA gene: KP689131 Analyse FASTA

Effective publication: Sijpesteijn AK. Cellulose-decomposing bacteria from the rumen of cattle. Thesis. University of Leiden, Leiden in The Netherlands, 1948.

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: correct name (and explicitly recommended for medical use)

Risk group: 1

• Notes:
  • 🥇 Nomenclatural type of the genus Ruminococcus Sijpesteijn 1948 (Approved Lists 1980). Publication: Sijpesteijn AK. Cellulose-decomposing bacteria from the rumen of cattle. Thesis. University of Leiden, Leiden in The Netherlands, 1948.
  • 😷 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 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 452 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 risk group of other species in the genus.
  • 🧍 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. 🇺🇸

Parent taxon: Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)

Assigned by: Sijpesteijn AK. Cellulose-decomposing bacteria from the rumen of cattle. Thesis. University of Leiden, Leiden in The Netherlands, 1948.

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Record number: 784835