sterolibacterium sterolibacterium sterolibacterium is a genus of gram-negative, oxidase- and catalase-positive rod-shaped bacteria from the family of rhodocyclaceae which belongs to the class of betaproteobacteria. so far there is only one species known of this genus (sterolibacterium denitrificans) sterolibacterium scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: nitrosomonadales family: sterolibacteriaceae genus: sterolibacteriumtarlera and denner 2003 species: sterolibacterium denitrificans type species sterolibacterium denitrificans