Extinct porpoise (†Semirostrum ceruttii)

Superdomain: Neomura

Domain: Eukaryota

Clade: Amorphea

(unranked): Obazoa

(unranked): Opisthokonta

(unranked) Holozoa

(unranked) Filozoa

Clade: Choanozoa

Kingdom: Animalia

Subkingdom: Eumetazoa

Clade: ParaHoxozoa

Clade: Bilateria

Clade: Nephrozoa

Superphylum: Deuterostomia

Phylum: Chordata

Clade: Olfactores

Subphylum: Vertebrata

Infraphylum: Gnathostomata

Clade: Eugnathostomata

Clade: Teleostomi

Superclass: Tetrapoda

Clade: Reptiliomorpha

Clade: Amniota

Class: Mammalia

Clade: Theriimorpha

Clade: Theriiformes

Clade: Trechnotheria

Clade: Cladotheria

Clade: Zatheria

Clade: Tribosphenida

Clade: Eutheria

Infraclass: Placentalia

Clade: Exafroplacentalia

Magnorder: Boreoeutheria

Superorder: Laurasiatheria

(unranked): Scrotifera

Grandorder: Ferungulata

Clade: Ungulata

Order: Artiodactyla

Clade: Artiofabula

Clade: Cetruminantia

Clade: Cetancodontamorpha

Suborder: Whippomorpha

Clade: Cetaceamorpha

Infraorder: Cetacea

Parvorder: Odontoceti

Clade: Delphinida

Superfamily: Delphinoidea

Family: Phocoenidae

Genus: †Semirostrum

Species: †S. ceruttii

Done