thiorhodococcus thiorhodococcus thiorhodococcus is a gram-negative genus of bacteria from the family of chromatiaceae. thiorhodococcus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: thiorhodococcusguyoneaud et al. 1998 type species thiorhodococcus minor species t. alkaliphilus t. fuscus t. kakinadensis t. mannitoliphagus t. minor t. modestalkaliphilus