halomonas stevensii halomonas stevensii halomonas stevensii is a halophilic bacteria first isolated from dialysis patients and the environment surrounding them. its genome has been sequenced. halomonas stevensii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: halomonadaceae genus: halomonas species: h. stevensii binomial name halomonas stevensiistevens et al., 2009