anaerobacter anaerobacter anaerobacter is a genus of gram-positive bacteria related to clostridium. they are anaerobic chemotrophs and are unusual spore-formers as they produce more than one spore per bacterial cell (up to five). they fix nitrogen. their g+c content is 29%. only one species of this genus (anaerobacter polyendosporus) has been described. anaerobacter scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: clostridiaceae genus: anaerobacterduda et al. 1996 species anaerobacter polyendosporus