pseudomonas meridiana pseudomonas meridiana pseudomonas meridiana is a psychrophilic, gram-negative, motile with a polar flagellum, rod-shaped bacterium isolated from cyanobacterial mats in antarctica. pseudomonas meridiana scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. meridiana binomial name pseudomonas meridianareddy, et al., 2004 type strain dsm 15319 mtcc 4993