undibacterium danionis undibacterium danionis undibacterium danionis is a gram-negative and rod-shaped bacterium from the genus of undibacterium which has been isolated from the fish danio rerio. undibacterium danionis scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: oxalobacteraceae genus: undibacterium species: u. danionis binomial name undibacterium danioniskämpfer et al. 2016 type strain ccm 8677, dsm 102221, strain e3/4