Corrigenda to the validation lists.

This paper documents errors, omissions, and repetitions in Validation Lists that have been published in the International Journal of Systematic Bacteriology and International Journal of Systematic and Evolutionary Microbiology since 1977. Validation Lists serve to officially validate bacterial nomenclature under the Bacteriological Code. The authors identify 18 bacterial names appearing in two separate validation lists that should only appear once, with proper date attribution given to the first appearance. The paper corrects numerous omissions where subspecies and subgenera should have been included but were inadvertently left out, such as Alcaligenes denitrificans subspecies and Acetobacter subgenera. Additionally, the authors document and correct numerous errors across 28 validation lists, including misspelled author names, incorrect type strain designations, misclassifications of nomenclatural status (such as incorrectly designating new combinations as new species), and transcription errors in strain numbers. Some complex nomenclatural issues, particularly regarding Aeromonas caviae and subgenera Moraxella and Branhamella, are noted as requiring further formal review. The corrections ensure accurate historical records of bacterial nomenclature validation and proper taxonomic attribution for researchers.

Key findings

• 18 bacterial names were repetitively listed in two different Validation Lists; proper priority dates are assigned to first appearances only
• Multiple omissions identified where subspecies and subgenera should have been validly published but were inadvertently excluded from validation lists
• Numerous transcriptional errors documented across validation lists including misspelled author names, incorrect strain designations, and wrong accession numbers
• Several taxa were incorrectly classified regarding nomenclatural status (e.g., new combinations misidentified as new species or vice versa)
• Some nomenclatural issues require formal opinion from the International Committee on Systematics of Prokaryotes for proper resolution