Species ***Clostridium* *estertheticum***

Name: Clostridium estertheticum Collins et al. 1993

Category: Species

Proposed as: sp. nov.

Etymology: es.ter.the’ti.cum. N.L. neut. n. ester, ester; Gr. neut. adj. thetikon, positive; N.L. neut. adj. estertheticum, ester-positive intended to mean ester-producing

Pronunciation (Latin), gender: klos-TRI-di-um es-ter-T^HE-ti-kum, neuter

Type strain: ATCC 51377; CIP 105093; DSM 8809; NCIBM 12511; NCIMB 12511

Conduct genome-based taxonomy at

16S rRNA gene: X68181 Analyse FASTA

Effective publication: Collins MD, Rodrigues UM, Dainty RH, Edwards RA, Roberts TA. Taxonomic studies on a psychrophilic Clostridium from vacuum-packed beef: description of Clostridium estertheticum sp. nov. FEMS Microbiol. Lett. 1992; 96:235-240. 🇬🇧

IJSEM list: Anonymous. Validation list no. 44. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1993; 43:188-189.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

Synonyms:

Name	Kind
Clostridium laramiense corrig. Kalchayanand et al. 1993	heterotypic synonym, validly published under the ICNP
Clostridium laramie Kalchayanand et al. 1993	heterotypic synonym, inaccurate spelling
Clostridium estertheticum subsp. laramiense (Kalchayanand et al. 1993) Spring et al. 2003	heterotypic synonym, validly published under the ICNP, distinct rank

Emendations:
- Spring et al. 2003 Spring S, Merkhoffer B, Weiss N, Kroppenstedt RM, Hippe H, Stackebrandt E. Characterization of novel psychrophilic clostridia from an Antarctic microbial mat: description of Clostridium frigoris sp. nov., Clostridium lacusfryxellense sp. nov., Clostridium bowmanii sp. nov. and Clostridium psychrophilum sp. nov. and reclassification of Clostridium laramiense as Clostridium estertheticum subsp. laramiense subsp. nov. Int J Syst Evol Microbiol 2003; 53:1019-1029. 🇩🇪 Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 4 of the IJSEM. Int J Syst Evol Microbiol 2003; 53:1703-1705.
  Notes:
  - 🧍 In the paper by Spring et al. 2003, Clostridium estertheticum Collins et al. 1993 is erroneously cited as Clostridium estertheticum Collins et al. 1992. — Subsequently, this species has been divided into subspecies (see: below).
- Dif et al. 2026 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. 🇩🇿 Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 76, part 2 of the IJSEM. Int J Syst Evol Microbiol 2026; 76:7121.
  Notes:
  - 🫂 Emendation accompanied by a proposal regarding the synonymy of the species.

Notes:
- ⏰ According to Dif et al. (2026), this species is an earlier heterotypic synonym of Clostridium laramie Kalchayanand et al. 1993. 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. 🇩🇿
- ⏰ According to Dif et al. (2026), this species is an earlier heterotypic synonym of Clostridium laramiense corrig. Kalchayanand et al. 1993. 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. 🇩🇿
- 🏢 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 76, part 2 of the IJSEM. Int J Syst Evol Microbiol 2026; 76:7121.
- 😷 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. — 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 53 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.

Subdivision:

Number of child taxa with a validly published and correct name: 0
Number of child taxa with a validly published name, including synonyms: 2
Total number of child taxa: 2

Child taxa:

Name	Nomenclatural status	Taxonomic status
Clostridium estertheticum subsp. estertheticum (Collins et al. 1993) Spring et al. 2003	validly published under the ICNP	synonym of its species
Clostridium estertheticum subsp. laramiense (Kalchayanand et al. 1993) Spring et al. 2003	validly published under the ICNP	synonym

Parent taxon: Clostridium Prazmowski 1880 (Approved Lists 1980)

Assigned by: Collins MD, Rodrigues UM, Dainty RH, Edwards RA, Roberts TA. Taxonomic studies on a psychrophilic Clostridium from vacuum-packed beef: description of Clostridium estertheticum sp. nov. FEMS Microbiol. Lett. 1992; 96:235-240. 🇬🇧

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Record number: 783663

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Version	Date	JSON
1	2026-03-31
2	2026-06-11

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Species Clostridium estertheticum

Species ***Clostridium* *estertheticum***