dyadobacter jejuensis dyadobacter jejuensis dyadobacter jejuensis is a bacterium from the genus of dyadobacter which has been isolated from seawater from the jeju island from korea. dyadobacter jejuensis scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: spirosomaceae genus: dyadobacter species: d. jejuensis binomial name dyadobacter jejuensischun et al. 2013 type strain am1r11, jcm 17918, kacc 16446