This notification list documents new bacterial and archaeal names and nomenclatural combinations that were formally published in volume 52, part 4 of the International Journal of Systematic and Evolutionary Microbiology (IJSEM) in 2002. The list catalogs 60 entries comprising new species descriptions, new genera, emendations of existing taxa, and new combinations where previously described organisms were reclassified into different genera. These include organisms from diverse environments: methane-producing archaea (Methanobrevibacter, Methanothermococcus), thermophilic bacteria (Vulcanisaeta, Thermobifida), marine organisms (Thalassospira, Nautilia), and various clinically or environmentally relevant bacteria. Several names required corrections to spelling, noted with "corrig." designations. The notification serves the bacteriological community by providing a centralized reference for validly published names according to priority rules, where names are listed in order of appearance by page number. This procedure was established by the Judicial Commission to facilitate recognition and adoption of legitimate taxonomic nomenclature.

Key findings

• 60 new bacterial and archaeal taxa were validly published in IJSEM volume 52, part 4, including new genera, new species, emendations, and new combinations
• Organisms described represent diverse ecological niches including methanogens, thermophiles, marine bacteria, and clinically relevant strains
• Some names required orthographic corrections (e.g., Caloramator viterbiensis, Thermobifida cellulosilytica) before validation
• Several previously named organisms were reclassified into existing or new genera through nomenclatural combinations
• The notification list provides a formal registry enabling systematic tracking of validly published bacterial nomenclature