thiohalomonas thiohalomonas thiohalomonas is a moderately halophilic and obligately chemolithoautotrophic genus of purple sulfur bacteria. thiohalomonas scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: ectothiorhodospiraceae genus: thiohalomonassorokin et al. 2007 type species thiohalomonas denitrificans species t. denitrificans t. nitratireducens