neptunomonas japonica neptunomonas japonica neptunomonas japonica is a species of bacteria. it is gram-negative, rod-shaped, non-spore-forming and motile by means of a single polar or subterminal flagellum. its type strain is jamm 0745t (=jcm 14595t=dsm 18939t). it was first found in carcasses of a sperm whale and is closely related to a symbiotic bacterial clone of the polychaete osedax japonicus. neptunomonas japonica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: oceanospirillaceae genus: neptunomonas species: n. japonica binomial name neptunomonas japonicamiyazaki et al. 2008