hahella chejuensis hahella chejuensis hahella chejuensis is a gram-negative, aerobic, rod-shaped and motile bacterium from the genus of hahella which has been isolated from marado in korea. hahella chejuensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: hahellaceae genus: hahella species: h. chejuensis binomial name hahella chejuensislee et al. 2001 type strain imsnu 11157, kctc 2396, strain 96cj10356