saonia saonia saonia is a gram-negative, aerobic and rod-shaped genus of bacteria from the family of flavobacteriaceae with one known species (saonia flava). saonia flava has been isolated from coastal seawater from the north-western mediterranean sea, saonia scientific classification domain: bacteria phylum: bacteroidota class: flavobacteria order: flavobacteriales family: flavobacteriaceae genus: saoniafagervold et al. 2017 type species saonia flava species s. flava