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Judicial Opinions 133 and 134.

International journal of systematic and evolutionary microbiology·2026
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International Code of Nomenclature of Prokaryotes. Prokaryotic Code (2025 Revision).

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International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of <i>Halobacteria</i> and Subcommittee on the Taxonomy of <i>Halomonadaceae</i>: minutes of the joint open meeting, 25 November 2025, Oaxaca, Mexico.

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Opinions 97, 98 and 99.

David R Arahal1,2

  • 1Judicial Commission of the International Committee on Systematics of Prokaryotes, Chair.

International Journal of Systematic and Evolutionary Microbiology
|January 9, 2020
PubMed
Summary

The International Committee on Systematics of Prokaryotes (ICSP) denied conservation of Streptomyces scabies, allowing Streptomyces scabiei. Two other bacterial names were invalidated due to lack of type material.

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Area of Science:

  • Prokaryotic taxonomy and nomenclature
  • Bacteriology
  • Microbial systematics

Background:

  • The International Committee on Systematics of Prokaryotes (ICSP) reviews nomenclature proposals.
  • Judicial Commission opinions address the validity and conservation of bacterial names.

Purpose of the Study:

  • To report on the formal endorsement of ICSP Judicial Commission opinions.
  • To clarify the official status of three bacterial names under the International Code of Nomenclature for algae, fungi, and bacteria.

Main Methods:

  • Formal review and endorsement of Judicial Commission opinions by the ICSP.
  • Evaluation of nomenclature requests based on established rules of bacterial taxonomy.

Main Results:

  • Opinion 97: The request to conserve the name *Streptomyces scabies* was denied.
  • Opinion 97 allows the continued use of the corrected name *Streptomyces scabiei*.
  • Opinions 98 and 99 invalidated *Bacillus aeolius* and *Pectinatus portalensis* due to absent type material.

Conclusions:

  • The ICSP formally approved the issuance of three key nomenclature opinions.
  • The name *Streptomyces scabiei* is confirmed as valid, while *Streptomyces scabies* is not conserved.
  • Two bacterial species names were deemed invalidly published, impacting prokaryotic classification.