chryseobacterium echinoideorum chryseobacterium echinoideorum chryseobacterium echinoideorum is a gram-negative, rod-shaped, aerobic and non-motile bacteria from the genus of chryseobacterium which has been isolated from a sea urchin (tripneustes gratilla) on the penghu island on taiwan. chryseobacterium echinoideorum produces flexirubin. chryseobacterium echinoideorum scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: weeksellaceae genus: chryseobacterium species: c. echinoideorum binomial name chryseobacterium echinoideorumlin et al. 2015