Notification list. Notification that new names and new combinations have appeared in volume 51, part 6, of the IJSEM.

This article is a notification list published in the International Journal of Systematic and Evolutionary Microbiology documenting new bacterial names and nomenclatural changes that appeared in volume 51, part 6. The list includes new genus and species descriptions across diverse bacterial groups, including Legionella, Fusobacterium, Mycobacterium, Vibrio, Clostridium, and various other bacteria. Additionally, the notification records emendations (corrections) to existing taxa, new combinations where organisms are reclassified into different genera, and nomenclatural corrections. A significant portion addresses reorganization within the Rickettsiales order, particularly amendments to Rickettsiaceae and the new family Anaplasmataceae, along with reclassifications of Ehrlichia and related genera into Anaplasma and Neorickettsia. The article serves as an official register to assist the bacteriological community in recognizing and tracking taxonomic changes, maintaining systematic nomenclature according to priority rules based on publication order.

Key findings

• Forty-three new bacterial names and combinations were formally proposed, spanning multiple genera including Clostridium, Legionella, Lactobacillus, and others
• Major taxonomic reorganization occurred within Rickettsiales, with creation of Anaplasmataceae family and reclassification of Ehrlichia species into Anaplasma and Neorickettsia genera
• Several Clostridium species underwent emendation, while multiple new Clostridium species were described including Clostridium saccharoperbutylacetonicum and Clostridium saccharobutylicum
• New genera were established including Opitutus, Arenibacter, Muricauda, Desulfomusa, Agreia, Jeotgalibacillus, and Marinibacillus