gemmatimonas gemmatimonas gemmatimonas is a gram-negative, rod-shaped, motile and non-spore-forming genus of bacteria from the family of gemmatimonaceae. gemmatimonas scientific classification domain: bacteria phylum: gemmatimonadota class: gemmatimonadetes order: gemmatimonadales family: gemmatimonadaceae genus: gemmatimonaszhang et al. 2003 species g. aurantiaca g. groenlandica g. phototrophica synonyms gemmimonas