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)
Neognathae (superorder)
Charadriiformes (order)
Alcidae (family)
[hide inferior taxa]
Aethia (genus)
Alca torda (species)
Alle alle (species)
Brachyramphus (genus)
Cepphus (genus)
Cyclorrhynchus psittacula (species)
Fratercula (genus)
Lunda cirrhata (species)
Ptychoramphus aleuticus (species)
Synthliboramphus (genus)
Uria (genus)