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

Category: Species

Proposed as: comb. nov.

Basonym: Acetomicrobium faecalis Winter et al. 1988

Etymology: fae.ca’lis. L. fem. n. faex (gen. faecis), dregs, faeces; L. masc./fem. adj. suff. -alis, suffix denoting pertaining to; N.L. masc. adj. faecalis, pertaining to faeces, faecal

Pronunciation (Latin), gender: kal-di-ko-pro-BAK-ter fa͡e-KA-lis, masculine

Type strain: DSM 20678; JCM 30420

Conduct genome-based taxonomy at

16S rRNA gene: FR749980 Analyse FASTA

Valid publication: Bouanane-Darenfed A, Ben Hania W, Cayol JL, Ollivier B, Fardeau ML. Reclassification of Acetomicrobium faecale as Caldicoprobacter faecalis comb. nov. Int J Syst Evol Microbiol 2015; 65:3286-3288. 🇫🇷

IJSEM list: Oren A, Garrity GM. Notification list. Notification that new names and new combinations have appeared in volume 65, part 10 of the IJSEM. Int J Syst Evol Microbiol 2016; 66:4-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 1

• Synonyms:

  • Name	Kind
    Acetomicrobium faecalis Winter et al. 1988	homotypic synonym, inaccurate spelling
    Acetomicrobium faecale corrig. Winter et al. 1988	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.
  • 😷 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 4 times in PubMed until 2026-06-11.
  • 🧍 In the protologue of the original publication (International Journal of Systematic and Evolutionary Microbiology 2015, 65, 3286–3288), a wrong JCM number is cited. JCM 30146 is the type strain of Desulfovibrio biadhensis Fadhlaoui et al. 2015. The correct number is JCM 30420. Publication: Fadhlaoui K, Ben Hania W, Postec A, Fauque G, Hamdi M, Ollivier B, Fardeau ML. Characterization of Desulfovibrio biadhensis sp. nov., isolated from a thermal spring. Int J Syst Evol Microbiol 2015; 65:1256-1261. 🇫🇷

Parent taxon: Caldicoprobacter Yokoyama et al. 2010

Assigned by: Bouanane-Darenfed A, Ben Hania W, Cayol JL, Ollivier B, Fardeau ML. Reclassification of Acetomicrobium faecale as Caldicoprobacter faecalis comb. nov. Int J Syst Evol Microbiol 2015; 65:3286-3288. 🇫🇷

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Record number: 793305