the root (no rank)
Bacteria (domain)
Proteobacteria (phylum)
Gammaproteobacteria (class)
Chromatiales (order)
Chromatiaceae (family)
Allochromatium (genus)
[hide inferior taxa]
Allochromatium minutissimum (species)
Allochromatium vinosum (species)
Allochromatium warmingii (species)