flavobacterium caeni flavobacterium caeni flavobacterium caeni is a gram-negative, heterotrophic, non-spore-forming, aerobic and non-motile bacterium from the genus of flavobacterium which has been isolated from activated sludge from a sequencing batch reactor. flavobacterium caeni scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: flavobacterium species: f. caeni binomial name flavobacterium caeniliu et al. 2010 type strain cgmcc 1.7031, nbrc 104239, lm5