azonexus azonexus azonexus is a genus of gram-negative, non-spore-forming, highly motile bacteria that is the type genus of the family azonexaceae which is in the order rhodocyclales of the class betaproteobacteria. azonexus scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: rhodocyclales family: azonexaceae genus: azonexusreinhold-hurek and hurek 2000 type species azonexus fungiphilus species azonexus caeni azonexus fungiphilus azonexus hydrophilus