halochromatium roseum halochromatium roseum halochromatium roseum is a gram-negative, rod-shaped, phototrophic and non-motile bacterium from the genus of halochromatium which has been isolated from a marine solar saltern from kakinada in india. halochromatium roseum scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: halochromatium species: h. roseum binomial name halochromatium roseumanil kumar et al. 2007 type strain atcc baa-1363, dsm 18859, jcm 14151, strain ja134 synonyms halochromatium roseilamprobacter pseudofilamentous