undibacterium piscinae undibacterium piscinae undibacterium piscinae is a gram-negative, rod-shaped, non-spore-forming, obligate aerobic and motile bacterium of the genus undibacterium which has been isolated from the intestinal tract of the fish coreoleuciscus splendidus. undibacterium piscinae scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: oxalobacteraceae genus: undibacterium species: u. piscinae binomial name undibacterium piscinaelee et al. 2019 type strain s11r28