olsenella olsenella olsenella is a gram-positive, non-spore-forming, obligate anaerobic and non-motile bacterial genus from the family atopobiaceae. olsenella is named after the microbiologist ingar olsen olsenella bacteria are involved in endodontic infections in humans. olsenella scientific classification domain: bacteria phylum: actinomycetota class: coriobacteriia order: coriobacteriales family: atopobiaceae genus: olsenelladewhirst et al. 2001 type species olsenella uli species o. profusa o. scatoligenes o. uli o. umbonata synonyms parafannyhessea zgheib et al. 2021