filifactor alocis filifactor alocis filifactor alocis is a bacterium from the family peptostreptococcaceae. filifactor alocis scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: filifactor species: f. alocis binomial name filifactor alocis(cato et al. 1985) jalava and eerola 1999 synonyms fusobacterium alocis cato et al. 1985 f. alocis is an important oral organism that is associated with periodontal disease and endodontic lesions.