pseudoalteromonas undina pseudoalteromonas undina pseudoalteromonas undina is a marine bacterium isolated from seawater off the coast of northern california. it was originally classified as alteromonas undina but was reclassified in 1995 to the genus pseudoalteromonas. pseudoalteromonas undina scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: pseudoalteromonadaceae genus: pseudoalteromonas binomial name pseudoalteromonas undina(chan et al., 1978) gauthier et al., 1995 synonyms alteromonas undina