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Volume 74, Issue 3

Proposed minimal standards for description of new taxa of the class Open Access

Abstract

Halophilic archaea of the class are the most salt-requiring prokaryotes within the domain . In 1997, minimal standards for the description of new taxa in the order were proposed. From then on, the taxonomy of the class provides an excellent example of how changing concepts on prokaryote taxonomy and the development of new methods were implemented. The last decades have witnessed a rapid expansion of the number of described taxa within the class coinciding with the era of genome sequencing development. The current members of the International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of propose these revisions to the recommended minimal standards and encourage the use of advanced technologies in the taxonomic description of members of the . Most previously required and some recommended minimal standards for the description of new taxa in the class were retained in the present revision, but changes have been proposed in line with the new methodologies. In addition to the 16S rRNA gene, the gene is an important molecular marker for the identification of members of the . Phylogenomic analysis based on concatenated conserved, single-copy marker genes is required to infer the taxonomic status of new taxa. The overall genome relatedness indexes have proven to be determinative in the classification of the taxa within the class . Average nucleotide identity, digital DNA–DNA hybridization, and average amino acid identity values should be calculated for rigorous comparison among close relatives.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Archaea , Halobacteria , phylogeny and taxonomy
Funding
This study was supported by the:
  • National Science and Technology Fundamental Resources Investigation Program of China (Award 2021FY100900)
    • Principle Award Recipient: Heng-LinCui
  • Junta de Andalucía (Award P20_01066 and BIO-213)
    • Principle Award Recipient: AntonioVentosa
  • Junta de Andalucía (Award P20_01066 and BIO-213)
    • Principle Award Recipient: CristinaSanchez-Porro
  • Junta de Andalucia (Award P20_01066 and BIO-213)
    • Principle Award Recipient: Rafaelde la Haba
  • National Science and technology fundamental resources investigation program of China (Award 2019FY100700)
    • Principle Award Recipient: Heng-LinCui
  • Innovative Research Group Project of the National Natural Science Foundation of China (Award 32070003)
    • Principle Award Recipient: JingHou
  • Innovative Research Group Project of the National Natural Science Foundation of China (Award 32070003)
    • Principle Award Recipient: Heng-LinCui
© 2024 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2024-04-27
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Proposed minimal standards for description of new taxa of the class Halobacteria
Int J Syst Evol Microbiol 74, 006290 (2024); https://doi.org/10.1099/ijsem.0.006290
/content/journal/ijsem/10.1099/ijsem.0.006290
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