the root (no rank)
Bacteria (domain)
Spirochaetes (phylum)
Spirochaetales (order)
Spirochaetaceae (family)
Brachyspira (genus)
[hide inferior taxa]
Brachyspira hyodysenteriae (species)
Brachyspira innocens (species)
Brachyspira pilosicoli (species)