flavobacterium crassostreae flavobacterium crassostreae flavobacterium crassostreae is a gram-negative and rod-shaped bacterium from the genus of flavobacterium which has been isolated from a pacific oyster. flavobacterium crassostreae scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: flavobacterium species: f. crassostreae binomial name flavobacterium crassostreaechoi et al. 2017 type strain jcm 31219, kacc 18706, lpb0076