List of extinct cetaceans explained

The list of extinct cetaceans features the extinct genera and species of the order Cetacea. The cetaceans (whales, dolphins and porpoises) are descendants of land-living mammals, the even-toed ungulates. The earliest cetaceans were still hoofed mammals. These early cetaceans became gradually better adapted for swimming than for walking on land, finally evolving into fully marine cetaceans.

This list currently includes only fossil genera and species. However, the Atlantic population of gray whales (Eschrichtius robustus) became extinct in the 18th century, and the baiji (or Chinese river dolphin, Lipotes vexillifer) was declared "functionally extinct" after an expedition in late 2006 failed to find any in the Yangtze River.

Suborder Archaeoceti

Family Ambulocetidae

(Eocene)

Family Basilosauridae

(Late Eocene)

Family Kekenodontidae

(Oligocene)

Family Pakicetidae

(Early to Middle Eocene)

Family Protocetidae

(Eocene)

Family Remingtonocetidae

(Eocene)

Suborder Mysticeti

Family Llanocetidae

(Late Eocene-Early Oligocene)

Family Mammalodontidae

(jr synonym Janjucetidae)(Late Oligocene)

Family incertae sedis

Family Aetiocetidae

(Oligocene)

Clade Chaeomysticeti

Family incertae sedis

Superfamily Eomysticetoidea

Family Cetotheriopsidae

(Oligocene to Miocene)

Family Eomysticetidae

(Oligocene to early Miocene)

Family Aglaocetidae

(Miocene)

Superfamily Balaenoidea

Family Balaenidae

(Miocene to Recent)

Family incertae sedis

Clade Thalassotherii

Family Cetotheriidae

(Miocene - Pliocene)

Classification follows Steeman (2007) unless otherwise noted.[13]

Family Diorocetidae

(Miocene to Pliocene)

Family Neobalaenidae

(Miocene to Recent)

Family Pelocetidae

(Miocene)

Family incertae sedis

Superfamily Balaenopteroidea

Family Balaenopteridae

(Miocene to Recent)

Family Eschrichtiidae

(Miocene to Recent)

Family Tranatocetidae
Family incertae sedis

Suborder Odontoceti

Basal forms

Family Agorophiidae

(Early Oligocene)

Family Ashleycetidae

(Early Oligocene)

Family Patriocetidae

(Oligocene to Early Miocene)

Family Simocetidae

(Early Oligocene)

Family Xenorophidae

(Late Oligocene)

Family Inticetidae

Family Microzeuglodontidae

Family Squaloziphiidae

(Late Oligocene to Early Miocene)

Family incertae sedis

Superfamily Squalodontoidea

Family Dalpiazinidae

(Late Oligocene to Miocene)

Family Prosqualodontidae

(Late Oligocene-Middle Miocene)

Superfamily Physeteroidea

Family Kogiidae

(Miocene to recent)

Family Physeteridae

Family incertae sedis

Superfamily "Eurhinodelphinoidea"

Family Argyrocetidae

(Late Oligocene to Early Miocene)

Family Eoplatanistidae

(Miocene)

Family Eurhinodelphinidae

(Late Oligocene to Late Miocene)

Superfamily Platanistoidea

Family Allodelphinidae

(Late Oligocene to Middle Miocene)

Family Platanistidae

(Early Miocene to Recent)

Family Squalodelphinidae

(Late Oligocene to Middle Miocene)

Family Squalodontidae

(Late Oligocene to Middle Miocene)

Family Waipatiidae

(Late Oligocene to Early Miocene)

Superfamily Ziphioidea

Family Ziphiidae

(Miocene to Recent)

Clade Delphinida

Family incertae sedis

Superfamily Delphinoidea

Family Albireonidae

(Miocene to Pliocene)

Family Delphinidae

(Oligocene to Recent)

Family Kentriodontidae

(Oligocene to Pliocene)

Family Monodontidae

(Miocene to Recent)

Family Odobenocetopsidae

(Late Miocene to Early Pliocene)

Family Phocoenidae

(Miocene to Recent)

Superfamily Inioidea

Family Iniidae

(Miocene to Recent)

Family Pontoporiidae

(Middle Miocene to Recent)

Superfamily Lipotoidea

Family Lipotidae

(Late Miocene to Recent)

Superfamily incertae sedis

Family incertae sedis

See also

Notes and References

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