cellvibrio japonicus cellvibrio japonicus cellvibrio japonicus is a gram-negative soil bacterium. cellvibrio japonicus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: cellvibrionales family: cellvibrionaceae genus: cellvibrio binomial name cellvibrio japonicushumphry et al. 2003 synonyms pseudomonas fluorescens subsp. cellulosa