Species Ruminococcus productus

Name: Ruminococcus productus (Prévot 1941) Ezaki et al. 1994

Category, proposed as: species, comb. nov.

Basonym: "Streptococcus productus" Prévot 1941

Etymology: pro.duc’tus. L. masc. part. adj. productus, lengthened, extended

Pronunciation (Latin), gender: ru-mi-no-KOK-kus pro-DUK-tus, masculine

Type strain: ATCC 27340; CCUG 10976; CCUG 9990; DSM 2950; JCM 1471

Conduct genome-based taxonomy at

16S rRNA gene: AB600998 Analyse FASTA

Valid publication: Ezaki T, Li N, Hashimoto Y, Miura H, Yamamoto H. 16S ribosomal DNA sequences of anaerobic cocci and proposal of Ruminococcus hansenii comb. nov. and Ruminococcus productus comb. nov. Int J Syst Bacteriol 1994; 44:130-136. 🇯🇵

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 44, part 1 of the IJSB. Int J Syst Bacteriol 1994; 44:372.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Blautia producta (Prévot 1941) Liu et al. 2008

Risk group: 2

• Synonyms:

  • Name	Kind
    "Streptococcus productus" Prévot 1941	homotypic synonym, not validly published, basonym of name in Approved Lists
    Clostridium coccoides Kaneuchi et al. 1976 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Peptostreptococcus productus (Prévot 1941) Smith 1957 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Blautia producta (Prévot 1941) Liu et al. 2008	homotypic synonym, validly published under the ICNP
    Blautia coccoides (Kaneuchi et al. 1976) Liu et al. 2008	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Fatahi-Bafghi (2025), this species is an earlier heterotypic synonym of Clostridium coccoides Kaneuchi et al. 1976 (Approved Lists 1980). Publication: Fatahi-Bafghi M. Genome-based reclassification of Blautia coccoides (Kaneuchi et al. 1976) Liu et al. 2008 as a later heterotypic synonym of Blautia producta (Prevot 1941) Liu et al. 2008. Int J Syst Evol Microbiol 2025; 75:6823. 🇮🇷
  • ⏰ According to Fatahi-Bafghi (2025), this species is an earlier heterotypic synonym of Blautia coccoides (Kaneuchi et al. 1976) Liu et al. 2008. Publication: Fatahi-Bafghi M. Genome-based reclassification of Blautia coccoides (Kaneuchi et al. 1976) Liu et al. 2008 as a later heterotypic synonym of Blautia producta (Prevot 1941) Liu et al. 2008. Int J Syst Evol Microbiol 2025; 75:6823. 🇮🇷
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 75, part 7 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6893.
  • ❗ Ruminococcus productus 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 = 2, note = "Animal classification RG: 2 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — 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. — The risk group for Taiwan has been imported on 2024-11-03. The full classification is: risk group = 1, note = "P650 = v". — 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 12 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 risk group 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. 🇬🇧
  • 🧍 See also: Publication: Hauduroy P, Ehringer G, Guillot G, Magrou J, Prévot AR, Rosset A, Urbain A. Dictionnaire des Bactéries Pathogènes, 2nd ed. Masson, Paris, 1953.
  • 🧍 The Latin adjective productus -a -um has several meanings. According to L.D.S. Smith 1957, this epithet means lengthened (i.e. the cells lengthen in culture; see Hauduroy et al. 1953), not produced. Publication: Smith LDS. Genus V. Peptostreptococcus Kluyver and van Niel, 1936,. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, 7th edition, The Williams & Wilkins Co., Baltimore, 1957, p. 533-541.

Parent taxon: Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)

Assigned by: Ezaki T, Li N, Hashimoto Y, Miura H, Yamamoto H. 16S ribosomal DNA sequences of anaerobic cocci and proposal of Ruminococcus hansenii comb. nov. and Ruminococcus productus comb. nov. Int J Syst Bacteriol 1994; 44:130-136. 🇯🇵

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Record number: 780618