thiogranum thiogranum thiogranum is an obligately chemolithoautotrophic genus of bacteria from the family of ectothiorhodospiraceae with one known species (thiogranum longum). thiogranum longum has been isolated from a rock from a deep-sea hydrothermal field from the coast of suiyo seamount in japan. thiogranum scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: ectothiorhodospiraceae genus: thiogranummori et al. 2015 type species thiogranum longum species t. longum