cellvibrio diazotrophicus cellvibrio diazotrophicus cellvibrio diazotrophicus is a gram-negative, rod-shaped, aerobic and nitrogen-fixing bacterium from the genus of cellvibrio which has been isolated from the rhizosphere of the plants plantago winteri and hordeum secalinum near münzenberg in germany. cellvibrio diazotrophicus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: cellvibrionales family: cellvibrionaceae genus: cellvibrio species: c. diazotrophicussuarez et al. 2014 binomial name cellvibrio diazotrophicus type strain e20, e50, kacc 17069, lmg 27267