pseudoalteromonas haloplanktis pseudoalteromonas haloplanktis pseudoalteromonas haloplanktis is a gram-negative, psychrophilic marine bacterium. pseudoalteromonas haloplanktis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: pseudoalteromonadaceae genus: pseudoalteromonas species: p. haloplanktis binomial name pseudoalteromonas haloplanktis(zobell and upham 1944) gauthier et al. 1995 synonyms vibrio haloplanktis zobell and upham 1944 vibrio marinopraesens zobell and upham 1944 alteromonas marinopraesens (zobell and upham 1944) baumann et al. 1972 alteromonas haloplanktis (zobell and upham 1944) reichelt and baumann 1973 pseudomonas enalia