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)
Sauropsida (no rank)
Sauria (no rank)
Archosauria (no rank)
Aves (class)
Palaeognathae (superorder)
Rheiformes (order)
Rheidae (family)
Pterocnemia pennata (species)
Darwin's rhea (primary common name)
[hide inferior taxa]