chryseobacterium caeni chryseobacterium caeni chryseobacterium caeni is a gram-negative and non-spore-forming bacteria from the genus of chryseobacterium which has been isolated from bioreactor sludge in daejeon in korea. chryseobacterium caeni scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: weeksellaceae genus: chryseobacterium species: c. caeni binomial name chryseobacterium caeniquan et al. 2007 type strain ccbau 10201 , cip 109625, dsm 17710, kctc 12506, n4