mesonia algae mesonia algae mesonia algae is a gram-negative, aerobic, moderately halophilic, heterotrophic and non-motile bacterium from the genus of mesonia which has been isolated from the alga acrosiphonia sonderi. mesonia algae scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: mesonia species: m. algae binomial name mesonia algaenedashkovskaya et al. 2003