Classification
Biota [regio]Animalia [regnum]
Chordata [phylum]
Aves [classis]
Charadriiformes [ordo]
Alcidae [familia]
Alca [genus]
Alca torda [species]
Alca torda Brehm, 1831 contains the following taxa:
Alca torda islandica Brehm, 1831 [subspecies]