Name: Clostridium botulinum subsp. combesii (Prévot and Laplanche 1947) Dif et al. 2026

Category: Subspecies

Proposed as: comb. nov.

Basonym: "Cillobacterium combesii" corrig. Prévot and Laplanche 1947

Etymology: com.be’si.i. N.L. gen. masc. n. combesii, named after Combes, to honour the original describer

Pronunciation (Latin), gender: … kom-BE-si-i, neuter

Type strain: A13D; ATCC 25545; DSM 20696; JCM 9988

Conduct genome-based taxonomy at

16S rRNA gene: MG334166 Analyse FASTA

Valid publication: Dif G, Bouras N, Djemouai N, Dif I, Zitouni A. Genome-based phylogenomic reassessment of Clostridium with proposals for species synonymization and new subspecies. Int J Syst Evol Microbiol 2026; 76:7048. 🇩🇿

Nomenclatural status: validly published under the ICNP

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

Correct name: Clostridium combesii (Prévot and Laplanche 1947) Bernard et al. 2018

• Synonyms:

  • Name	Kind
    "Cillobacterium combesi" Prévot and Laplanche 1947	homotypic synonym, inaccurate spelling, distinct rank
    "Cillobacterium combesii" corrig. Prévot and Laplanche 1947	homotypic synonym, not validly published, basonym of name in Approved Lists, distinct rank
    Eubacterium combesii (Prévot and Laplanche 1947) Holdeman and Moore 1970 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP, distinct rank
    Clostridium combesii (Prévot and Laplanche 1947) Bernard et al. 2018	homotypic synonym, validly published under the ICNP, distinct rank

• Notes:
  • ❗ Clostridium botulinum subsp. combesii is the correct name instead if this subspecies is regarded as a separate subspecies (i.e., if its nomenclatural type is not assigned to another subspecies whose name is validly published, legitimate and not rejected and has priority) within a separate species Clostridium botulinum within a separate genus Clostridium.
  • 😷 The taxon name shown here has no risk group assigned, but is the homotypic synonym of Clostridium combesii (Prévot and Laplanche 1947) Bernard et al. 2018, which has a risk group (Belgium) above 1. This may require that the name shown here is not treated as the correct name for practical purposes.
  • 😷 The taxon name shown here has no risk group assigned, but is the homotypic synonym of Eubacterium combesii (Prévot and Laplanche 1947) Holdeman and Moore 1970 (Approved Lists 1980), which has a risk group (Belgium) above 1. This may require that the name shown here is not treated as the correct name for practical purposes. — The taxon name shown here has no risk group assigned, but is the homotypic synonym of Eubacterium combesii (Prévot and Laplanche 1947) Holdeman and Moore 1970 (Approved Lists 1980), which has a risk group (Canada) above 1. This may require that the name shown here is not treated as the correct name for practical purposes. — The taxon name shown here has no risk group assigned, but is the homotypic synonym of Eubacterium combesii (Prévot and Laplanche 1947) Holdeman and Moore 1970 (Approved Lists 1980), which has a risk group (Swiss Confederation) above 1. This may require that the name shown here is not treated as the correct name for practical purposes. — The taxon name shown here has no risk group assigned, but is the homotypic synonym of Eubacterium combesii (Prévot and Laplanche 1947) Holdeman and Moore 1970 (Approved Lists 1980), which has a risk group (Germany) above 1. This may require that the name shown here is not treated as the correct name for practical purposes.
  • 🙅 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 subspecies. The name is on LoRN because of the recorded risk group of the species itself.

Parent taxon: Clostridium botulinum (van Ermengem 1896) Bergey et al. 1923 (Approved Lists 1980)

Assigned by: Dif G, Bouras N, Djemouai N, Dif I, Zitouni A. Genome-based phylogenomic reassessment of Clostridium with proposals for species synonymization and new subspecies. Int J Syst Evol Microbiol 2026; 76:7048. 🇩🇿

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Record number: 70853