the root (no rank)
Bacteria (domain)
Proteobacteria (phylum)
Alphaproteobacteria (class)
Rhizobiales (order)
Hyphomicrobiaceae (family)
[hide inferior taxa]
Ancylobacter aquaticus (species)
Azorhizobium (genus)
Hyphomicrobium (genus)
Rhodomicrobium vannielii (species)
Starkeya novella (species)
Xanthobacter (genus)