the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Chordata (phylum)
Craniata (subphylum)
Vertebrata (no rank)
Gnathostomata (superclass)
Sarcopterygii (class)
Tetrapoda (no rank)
Amniota (no rank)
Mammalia (class)
Prototheria (superorder)
Monotremata (order)
Ornithorhynchidae (family)
[hide inferior taxa]
Ornithorhynchus anatinus (species)