the root (no rank)
Bacteria (domain)
Proteobacteria (phylum)
Gammaproteobacteria (class)
Chromatiales (order)
Chromatiaceae (family)
Chromatium (genus)
[hide inferior taxa]
Chromatium gracile (species)
Chromatium okenii (species)
Chromatium salexigens (species)
Chromatium tepidum (species)
Chromatium vinosum (species)