halomonas johnsoniae halomonas johnsoniae halomonas johnsoniae is a halophilic bacteria first isolated from the environment surrounding dialysis patients. it is closely related to h. magadiensis. halomonas johnsoniae scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: halomonadaceae genus: halomonas species: h. johnsoniae binomial name halomonas johnsoniaestevens et al., 2009