This notification list from the International Journal of Systematic and Evolutionary Microbiology documents new bacterial names and nomenclatural combinations published in volume 51, part 4 of the journal. The list catalogs approximately 80 novel bacterial taxa and reclassifications, including new genera such as Alkaliphilus, Thalassomonas, Samsonia, and Chromohalobacter, along with numerous new species assignments. Many entries represent reclassifications of previously named organisms; for example, several Sphingomonas species were reclassified into new genera including Sphingobium, Novosphingobium, and Sphingopyxis. The list also includes corrections to previously published names, particularly for Mycoplasma species and several Vibrio and Nocardia species. This notification serves as an official registry to assist the bacteriological community in recognizing validated new names and combinations, following procedures established by the Judicial Commission to maintain standardized bacterial nomenclature.

Key findings

• Approximately 80 new bacterial species and genera names were officially validated and published, establishing priority through IJSEM volume 51, part 4
• Significant taxonomic reorganization occurred within Sphingomonas, with multiple species reclassified into newly established genera (Sphingobium, Novosphingobium, Sphingopyxis)
• Several previous nomenclatural errors were corrected, including species names in Vibrio, Nocardia, Bartonella, and Mycoplasma genera
• New bacterial taxa encompassed diverse physiological groups including alkaliphilic, thermophilic, and anaerobic organisms from various environmental sources