chelatococcus caeni chelatococcus caeni chelatococcus caeni is a gram-negative, non-spore-forming, rod-shaped and motile bacterium from the genus of chelatococcus which has been isolated from biofilm reactor sludge in korea. chelatococcus caeni scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: chelatococcaceae genus: chelatococcus species: c. caeni binomial name chelatococcus caenijin et al. 2015 type strain ebr-4-1, jcm 30181, kctc 32487