This validation list from the International Journal of Systematic and Evolutionary Microbiology establishes the official valid publication of 69 newly named bacterial and archaeal taxa previously published in other journals. The document serves as the authoritative registry for bacterial nomenclature, making these names available for use in scientific literature. The taxa include new species such as Amphibacillus fermentum, Oceanobacillus iheyensis, and several methanogenic archaea, as well as higher taxonomic ranks including new orders, families, and classes. Notably, numerous thermophilic and extremophilic organisms are validated, reflecting recent discoveries in extreme environment microbiology. The validation process requires that authors demonstrate compliance with nomenclatural rules before names are officially recognized. The article clarifies that validation constitutes nomenclatural recognition only, not taxonomic acceptance; organisms may later be reclassified or names may become synonyms as knowledge advances. Strain deposit information and reference culture collections are provided for each validated taxon, ensuring traceability and accessibility for the scientific community.

Key findings

• 69 newly named bacterial and archaeal taxa received valid nomenclatural publication through this validation list
• Validated organisms include diverse extremophiles such as thermophilic, halotolerant, and alkaliphilic species, reflecting expanding knowledge of extreme habitats
• Multiple new higher-order taxonomic ranks were established, including new classes, orders, and families across both bacterial and archaeal domains
• Validation represents nomenclatural recognition only; it does not imply taxonomic acceptance and taxa may require reclassification in the future
• All validated taxa include designated type strains deposited in internationally recognized culture collections for reproducibility and reference