roseomonas frigidaquae roseomonas frigidaquae roseomonas frigidaquae is a species of gram negative, strictly aerobic, coccobacilli-shaped, light pink-colored bacteria. it was first isolated from a water-cooling system from an oxygen-producing plant in gwangyang, south korea. the species name is derived from latin frigidus (cold) and aqua (water). roseomonas frigidaquae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: acetobacteraceae genus: roseomonas species: r. frigidaquae binomial name roseomonas frigidaquaekim 2009 the optimum growth temperature for r. frigidaquae is 30 °c, but can grow in the 12-37 °c range. the optimum ph is 7.0, and can grow in ph 6.0-10.0.