Name: Rikenella microfusus (Kaneuchi and Mitsuoka 1978) Collins et al. 1985

Category: Species

Proposed as: comb. nov.

Basonym: Bacteroides microfusus Kaneuchi and Mitsuoka 1978 (Approved Lists 1980)

Etymology: mi.cro.fu’sus. Gr. masc. adj. mikros, small (may keep -o); L. masc. n. fusus, a spindle; N.L. masc. n. microfusus, a small spindle (referring to cellular morphology) (nominative in apposition)

Pronunciation, gender: mi-kro-FU-sus, feminine

Type strain: ATCC 29728; CCUG 54772; DSM 15922; JCM 2053; NCTC 11190

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB971798 Analyse FASTA

Effective publication: Collins MD, Shah HN, Mitsuoka T. Reclassification of Bacteroides microfusus (Kaneuchi and Mitsuoka) in a new genus Rikenella, as Rikenella microfusus comb. nov. Syst. Appl. Microbiol. 1985; 6:79-81.

IJSEM list: Anonymous. Validation list no. 18. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1985; 35:375-376.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Bacteroides microfusus Kaneuchi and Mitsuoka 1978 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Emendations:
  • Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.
    Notes:
    • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project.

• Notes:
  • 🥇 Nomenclatural type of the genus Rikenella Collins et al. 1985. Publication: Collins MD, Shah HN, Mitsuoka T. Reclassification of Bacteroides microfusus (Kaneuchi and Mitsuoka) in a new genus Rikenella, as Rikenella microfusus comb. nov. Syst. Appl. Microbiol. 1985; 6:79-81.
  • 😷 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 6 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 the genus.

Parent taxon: Rikenella Collins et al. 1985

Assigned by: Collins MD, Shah HN, Mitsuoka T. Reclassification of Bacteroides microfusus (Kaneuchi and Mitsuoka) in a new genus Rikenella, as Rikenella microfusus comb. nov. Syst. Appl. Microbiol. 1985; 6:79-81.

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Record number: 780560