Name: Acetomicrobium faecale corrig. Winter et al. 1988

Category: Species

Proposed as: sp. nov.

Etymology: fae.ca’le. L. fem. n. faex (gen. faecis), dregs, faeces; L. neut. adj. suff. -ale, suffix denoting pertaining to; N.L. neut. adj. faecale, pertaining to faeces, fecal

Gender: neuter

Type strain: DSM 20678; JCM 30420

Conduct genome-based taxonomy at

16S rRNA gene: FR749980 Analyse FASTA

Effective publication: Winter J, Braun E, Zabel HP. Acetomicrobium faecalis spec. nov., a strictly anaerobic bacterium from sewage sludge, producing ethanol from pentoses. Syst. Appl. Microbiol. 1987; 9:71-76.

IJSEM list: Anonymous. Validation list no. 24. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1988; 38:136-137.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Caldicoprobacter faecalis (Winter et al. 1988) Bouanane-Darenfed et al. 2015

Risk group: 1

• Synonyms:

  • Name	Kind
    Acetomicrobium faecalis Winter et al. 1988	other spelling of name, inaccurate spelling
    Caldicoprobacter faecalis (Winter et al. 1988) Bouanane-Darenfed et al. 2015	homotypic synonym, validly published under the ICNP

• Notes:
  • ⏲ According to Bouznada et al. (2024), this species is a later heterotypic synonym of Caldicoprobacter oshimai Yokoyama et al. 2010 but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Bouznada K, Saker R, Belaouni HA, Meklat A. Phylogenomic Analysis Supports the Reclassification of Caldicoprobacter faecalis (Winter et al. 1988) Bouanane-Darenfed et al. (2015) as a Later Heterotypic Synonym of Caldicoprobacter oshimai Yokoyama et al. (2010). Curr Microbiol 2024; 81:363.
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. List of changes in taxonomic opinion no. 41. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2025; 75:6561.
  • 😩 Deposit incorrectly indicated in some sources as representing the type strain of this taxon: JCM 30146.
  • ❗ Acetomicrobium faecale 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 Acetomicrobium.
  • 😷 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. — The risk group for Germany has been imported on 2023-10-29. 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 2 times in PubMed until 2024-03-28.
  • 🧍 The original spelling of the specific epithet, faecalis (sic), has been corrected by Euzéby 1998. Publication: Euzéby JP. Taxonomic note: necessary correction of specific and subspecific epithets according to Rules 12c and 13b of the International Code of Nomenclature of Bacteria (1990 Revision). Int. J. Syst. Bacteriol. 1998; 48:1073-1075.
  • 🧍 Yarza et al. (2013) expected for accessions FR749980-FR749983, originating from the alleged type-strain deposit DSM 20678, an affiliation with Bacteroidaceae (Bacteroidetes) but observed an affiliation with a deep branch in Clostridia and 99.46% similarity against Caldicoprobacter oshimai. Publication: Yarza P, Sproer C, Swiderski J, Mrotzek N, Spring S, Tindall BJ, Gronow S, Pukall R, Klenk HP, Lang E, et al. Sequencing orphan species initiative (SOS): Filling the gaps in the 16S rRNA gene sequence database for all species with validly published names. Syst Appl Microbiol 2013; 36:69-73.
  • 🧍 Nom. corrig.: IJSB 48:1073; Acetomicrobium faecalis (sic). Publication: Euzéby JP. Taxonomic note: necessary correction of specific and subspecific epithets according to Rules 12c and 13b of the International Code of Nomenclature of Bacteria (1990 Revision). Int. J. Syst. Bacteriol. 1998; 48:1073-1075.

Parent taxon: Acetomicrobium Soutschek et al. 1985

Assigned by: Winter J, Braun E, Zabel HP. Acetomicrobium faecalis spec. nov., a strictly anaerobic bacterium from sewage sludge, producing ethanol from pentoses. Syst. Appl. Microbiol. 1987; 9:71-76.

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Record number: 772540