Name: Acetivibrio clariflavus (Shiratori et al. 2009) Tindall 2019

Category: Species

Proposed as: comb. nov.

Basonym: Clostridium clariflavum Shiratori et al. 2009

Etymology: cla.ri.fla’vus. L. masc. adj. clarus, clear, bright, shining, brilliant; L. masc. adj. flavus, yellow; N.L. masc. adj. clariflavus, bright yellow, the colour of the colonies or pigment

Pronunciation (Latin), gender: a-ke-ti-WI-bri-o kla-ri-FLA-wus, masculine

Type strain: DSM 19732; EBR-02E-0045; EBR45; NBRC 101661

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB186359 Analyse FASTA

Valid publication: Tindall BJ. The names Hungateiclostridium Zhang et al. 2018, Hungateiclostridium thermocellum (Viljoen et al. 1926) Zhang et al. 2018, Hungateiclostridium cellulolyticum (Patel et al. 1980) Zhang et al. 2018, Hungateiclostridium aldrichii (Yang et al. 1990) Zhang et al. 2018, Hungateiclostridium alkalicellulosi (Zhilina et al. 2006) Zhang et al. 2018, Hungateiclostridium clariflavum (Shiratori et al. 2009) Zhang et al. 2018, Hungateiclostridium straminisolvens (Kato et al. 2004) Zhang et al. 2018 and Hungateiclostridium saccincola (Koeck et al. 2016) Zhang et al. 2018 contravene Rule 51b of the International Code of Nomenclature of Prokaryotes and require replacement names in the genus Acetivibrio Patel et al. 1980. Int J Syst Evol Microbiol 2019; 69:3927-3932. 🇩🇪

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 69, part 12 of the IJSEM. Int J Syst Evol Microbiol 2020; 70:1447-1449.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Hungateiclostridium clariflavum (Shiratori et al. 2009) Zhang et al. 2018	homotypic synonym, validly published under the ICNP, illegitimate name
    Clostridium clariflavum Shiratori et al. 2009	homotypic synonym, validly published under the ICNP

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.12105 (N = 56).
  • 😷 The risk group for Germany has been imported on 2026-08-13. 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 13 times in PubMed until 2026-06-11.
  • 🫡 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. This name is not taxonomically suspended any more in favour of Clostridium clariflavum Shiratori et al. 2009. Publication: Shiratori H, Sasaya K, Ohiwa H, Ikeno H, Ayame S, Kataoka N, Miya A, Beppu T, Ueda K. Clostridium clariflavum sp. nov. and Clostridium caenicola sp. nov., moderately thermophilic, cellulose-/cellobiose-digesting bacteria isolated from methanogenic sludge. Int J Syst Evol Microbiol 2009; 59:1764-1770. 🇯🇵 Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 59, part 7 of the IJSEM. Int J Syst Evol Microbiol 2009; 59:2381-2382.

Parent taxon: Acetivibrio Patel et al. 1980

Assigned by: Tindall BJ. The names Hungateiclostridium Zhang et al. 2018, Hungateiclostridium thermocellum (Viljoen et al. 1926) Zhang et al. 2018, Hungateiclostridium cellulolyticum (Patel et al. 1980) Zhang et al. 2018, Hungateiclostridium aldrichii (Yang et al. 1990) Zhang et al. 2018, Hungateiclostridium alkalicellulosi (Zhilina et al. 2006) Zhang et al. 2018, Hungateiclostridium clariflavum (Shiratori et al. 2009) Zhang et al. 2018, Hungateiclostridium straminisolvens (Kato et al. 2004) Zhang et al. 2018 and Hungateiclostridium saccincola (Koeck et al. 2016) Zhang et al. 2018 contravene Rule 51b of the International Code of Nomenclature of Prokaryotes and require replacement names in the genus Acetivibrio Patel et al. 1980. Int J Syst Evol Microbiol 2019; 69:3927-3932. 🇩🇪

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Record number: 5949