kingdom: Animalia >
phylum: Chordata >
subphylum: Vertebrata >
infraphylum: Gnathostomata >
parvphylum: Osteichthyes >
megaclass: Tetrapoda >
class: Aves >
order: Procellariiformes >
family: Procellariidae Leach, 1820 >
genus: Pachyptila Illiger, 1811 >
species: Pachyptila crassirostris (Mathews, 1912) >