natranaerobiales natranaerobiales the natranaerobiales are an order of bacteria placed within the class clostridia. this order contains the thermophilic bacterial species natranaerobius thermophilus and the related species natranaerobaculum magadiense. natranaerobiales scientific classification domain: bacteria phylum: bacillota class: "natranaerobiia" order: natranaerobialesmesbah et al. 2007 families natranaerobiaceae natranaerofabaceae