roseomonas aquatica roseomonas aquatica roseomonas aquatica is a species of gram negative, strictly aerobic, coccobacilli-shaped, pale pink-colored bacterium. it was first isolated from drinking water from seville, spain. the species name is derived from the latin aquatica (found in water, aquatic). roseomonas aquatica scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: roseomonas species: r. aquatica binomial name roseomonas aquaticagallego 2006 the optimum growth temperature for r. aquatica is 25-28 °c, but can grow in the 15-35 °c range. the optimum ph is 7.0, and can grow in ph 5.0-9.0.