Name: Caldicoprobacter oshimai Yokoyama et al. 2010

Category: Species

Proposed as: sp. nov.

Etymology: o.shi’ma.i. N.L. gen. masc. n. oshimai, of Oshima, named after the Japanese microbiologist Tairo Oshima, in honour of his many contributions to our knowledge of thermophiles and their biochemistry

Pronunciation, gender: o-S͡HI-ma-i, masculine

Type strain: ATCC BAA-1711; DSM 21659; JW/HY-331

Conduct genome-based taxonomy at

16S rRNA gene: AB450762 Analyse FASTA

Valid publication: Yokoyama H, Wagner ID, Wiegel J. Caldicoprobacter oshimai gen. nov., sp. nov., an anaerobic, xylanolytic, extremely thermophilic bacterium isolated from sheep faeces, and proposal of Caldicoprobacteraceae fam. nov. Int J Syst Evol Microbiol 2010; 60:67-71.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 60, part 1 of the IJSEM. Int J Syst Evol Microbiol 2010; 60:719-720.

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
    Caldicoprobacter faecalis (Winter et al. 1988) Bouanane-Darenfed et al. 2015	heterotypic synonym, validly published under the ICNP
    Acetomicrobium faecale corrig. Winter et al. 1988	heterotypic synonym, validly published under the ICNP
    Acetomicrobium faecalis Winter et al. 1988	heterotypic synonym, inaccurate spelling

• Emendations:
  • Bouznada et al. 2024 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.
    Notes:
    • 🫂 Emendation accompanied by a proposal regarding the synonymy of the species.
    • 🧍 As of 2024-11-03 this emendation was not yet included in an IJSEM List of Changes in Taxonomic Opinion.

• Notes:
  • 🥇 Nomenclatural type of the genus Caldicoprobacter Yokoyama et al. 2010. Publication: Yokoyama H, Wagner ID, Wiegel J. Caldicoprobacter oshimai gen. nov., sp. nov., an anaerobic, xylanolytic, extremely thermophilic bacterium isolated from sheep faeces, and proposal of Caldicoprobacteraceae fam. nov. Int J Syst Evol Microbiol 2010; 60:67-71.
  • ⏰ According to Bouznada et al. (2024), this species is an earlier heterotypic synonym of Acetomicrobium faecale corrig. Winter et al. 1988 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.
  • ⏰ According to Bouznada et al. (2024), this species is an earlier heterotypic synonym of Acetomicrobium faecalis Winter et al. 1988 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.
  • ⏰ According to Bouznada et al. (2024), this species is an earlier heterotypic synonym of Caldicoprobacter faecalis (Winter et al. 1988) Bouanane-Darenfed et al. 2015 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.
  • ❗ Caldicoprobacter oshimai 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 Caldicoprobacter.
  • 😷 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 6 times in PubMed until 2025-06-04.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683.

Parent taxon: Caldicoprobacter Yokoyama et al. 2010

Assigned by: Yokoyama H, Wagner ID, Wiegel J. Caldicoprobacter oshimai gen. nov., sp. nov., an anaerobic, xylanolytic, extremely thermophilic bacterium isolated from sheep faeces, and proposal of Caldicoprobacteraceae fam. nov. Int J Syst Evol Microbiol 2010; 60:67-71.

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Record number: 788310