methylohalomonas methylohalomonas methylohalomonas is a moderately halophilic and obligately methylotrophic genus of purple sulfur bacteria with one known species (methylohalomonas lacus). methylohalomonas lacus has been isolated from hypersaline lakes from the kulunda steppe in russia. methylohalomonas scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: ectothiorhodospiraceae genus: methylohalomonassorokin et al. 2007 type species methylohalomonas lacus species m. lacus