ulvibacterium ulvibacterium ulvibacterium is a gram-negative, aerobic, rod-shaped and non-motile genus of bacteria from the family of flavobacteriaceae with one known species (ulvibacterium marinum). ulvibacterium marinum has been isolated from the alga ulva prolifera. ulvibacterium scientific classification domain: bacteria phylum: bacteroidota class: flavobacteria order: flavobacteriales family: flavobacteriaceae genus: ulvibacteriumzhang et al. 2021 type species ulvibacterium marinum species u. marinum