Paenibacillus durus (Collins et al. 1994, formerly Clostridium durum Smith and Cato 1974) has priority over Paenibacillus azotofixans (Seldin et al. 1984). Opinion 73.

The Judicial Commission of the International Committee on Systematics of Prokaryotes decided that the name Paenibacillus durus has priority over Paenibacillus azotofixans, and that the latter is a later synonym of the former. The type strain is therefore strain ATCC 27763 (= DSM 1735).