gemmatimonas aurantiaca gemmatimonas aurantiaca gemmatimonas aurantiaca is a gram-negative, aerobic, polyphosphate-accumulating micro-organism. it is a gram-negative, rod-shaped aerobe, with type strain t-27t (=jcm 11422t =dsm 14586t). it replicates by budding. gemmatimonas aurantiaca gemmatimonas aurantiaca scientific classification domain: bacteria phylum: gemmatimonadota class: gemmatimonadetes order: gemmatimonadales family: gemmatimonadaceae genus: gemmatimonas species: g. aurantiaca binomial name gemmatimonas aurantiacazhang et al. 2003