thiobaca thiobaca thiobaca is a phototrophic and motile genus of bacteria from the family of chromatiaceae with one known species (thiobaca trueperi). thiobaca trueperi has been isolated from sediments from a eutrophic lake. thiobaca scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: thiobacarees et al. 2002 type species thiobaca trueperi species t. trueperi