Name: Enterocloster clostridioformis (Burri and Ankersmit 1906) Haas and Blanchard 2020

Category: Species

Proposed as: comb. nov.

Basonym: "Bacterium clostridiiforme" Burri and Ankersmit 1906

Etymology: clos.tri.di.o.for’mis. Gr. masc. n. klôstêr, a spindle; N.L. neut. dim. n. clostridium, a small spindle; L. adj. suff. -formis -is -e, -like, in the shape of; from L. fem. n. forma, figure, shape, appearance; N.L. masc. adj. clostridioformis, in the form of a small spindle, spindle-shaped

Pronunciation, gender: klos-tri-di-o-FOR-mis, masculine

Type strain: ATCC 25537; BCRC 14545; CCRC 14545; CCUG 16791; CIP 104318; DSM 933; JCM 1291; NCIMB 11018; NCTC 11224; VPI 0316

Conduct genome-based taxonomy at

16S rRNA gene: M59089 Analyse FASTA

Valid publication: Haas KN, Blanchard JL. Reclassification of the Clostridium clostridioforme and Clostridium sphenoides clades as Enterocloster gen. nov. and Lacrimispora gen. nov., including reclassification of 15 taxa. Int J Syst Evol Microbiol 2020; 70:23-34.

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 70, part 1 of the IJSEM. Int J Syst Evol Microbiol 2020; 70:2167-2173.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Synonyms:

  • Name	Kind
    Clostridium clostridiiforme (Burri and Ankersmit 1906) Kaneuchi et al. 1976 (Approved Lists 1980)	homotypic synonym, inaccurate spelling
    Clostridium clostridioforme corrig. (Burri and Ankersmit 1906) Kaneuchi et al. 1976 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    "Bacterium clostridiiforme" Burri and Ankersmit 1906	homotypic synonym, not validly published, basonym of name in Approved Lists
    "Bacteroides clostridiiformis" (Burri and Ankersmit 1906) Holdeman and Moore 1970	homotypic synonym, not validly published

• Notes:
  • 🥇 Nomenclatural type of the genus Enterocloster Haas and Blanchard 2020. Publication: Haas KN, Blanchard JL. Reclassification of the Clostridium clostridioforme and Clostridium sphenoides clades as Enterocloster gen. nov. and Lacrimispora gen. nov., including reclassification of 15 taxa. Int J Syst Evol Microbiol 2020; 70:23-34.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — 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 10 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 species itself. This name is not taxonomically suspended any more in favour of Clostridium clostridioforme corrig. (Burri and Ankersmit 1906) Kaneuchi et al. 1976 (Approved Lists 1980). Publication: Kaneuchi C, Watanabe K, Terada A, Benno Y, Mitsuoka T. Taxonomic study of Bacteroides clostridiiformis subsp. clostridiiformis (Burri and Ankersmit) Holdeman and Moore and of related organisms: proposal of Clostridium clostridiiforme (Burri and Andersmit) comb. nov. and Clostridium symbiosum (Stevens) comb. nov. International Journal of Systematic Bacteriology 1976; 26:195-204. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Parent taxon: Enterocloster Haas and Blanchard 2020

Assigned by: Haas KN, Blanchard JL. Reclassification of the Clostridium clostridioforme and Clostridium sphenoides clades as Enterocloster gen. nov. and Lacrimispora gen. nov., including reclassification of 15 taxa. Int J Syst Evol Microbiol 2020; 70:23-34.

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Record number: 5950