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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 75, Issue 6

Taxonomic rearrangement of , , , , and : refining genus boundaries and proposal of two new genera – gen. nov. and gen. nov. No Access

Abstract

The actinobacterial family comprises a diverse group of Gram-positive bacteria with high G+C content and complex taxonomic challenges. Traditional polyphasic approaches, based on 16S rRNA phylogeny and phenotypic traits, have in some instances resulted in polyphyletic taxonomic groupings, necessitating genome-wide methodologies to better resolve evolutionary relationships. This study employs a taxogenomic approach – incorporating 16S rRNA gene sequencing, core protein phylogeny, average amino acid identity and percentage of conserved proteins – to reassess the genera , , , , and . The findings reveal significant polyphyly in , and , indicating ecological convergence rather than shared ancestry. Proposed taxonomic revisions include the reclassification of and into , and into , and and into . should be incorporated into . Additionally, is reassigned to . Two new genera were also proposed to encompass “Leifsonia flava” and , named gen. nov. and another to encompass , named gen. nov. These genome-based insights provide a refined framework for the taxonomy of , enhancing our understanding of their evolutionary and ecological roles.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Antiquaquibacter , Diaminobutyricibacter , Glaciibacter , Homoserinimonas , Leifsonia , Salinibacterium and taxogenomic rearrangements
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2025-06-18
2026-03-09

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Taxonomic rearrangement of Salinibacterium, Leifsonia, Diaminobutyricibacter, Antiquaquibacter, Homoserinimonas and Glaciibacter: refining genus boundaries and proposal of two new genera – Orlajensenia gen. nov. and Leifsonella gen. nov.
Int J Syst Evol Microbiol 75, 006809 (2025); https://doi.org/10.1099/ijsem.0.006809
/content/journal/ijsem/10.1099/ijsem.0.006809
/content/journal/ijsem/10.1099/ijsem.0.006809
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