Protocetus

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iProtocetus
Fossil range: Mid Eocene
Conservation status
Extinct (fossil)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Cetacea
Suborder: Archaeoceti
Family: Protocetidae
Genus: Protocetus
Species: P. atavus
Binomial name
Protocetus atavus
Fraas, 1904

Protocetus atavus ('first whale') is an extinct species of primitive cetacean.

The 2,50 m (8 ft) creature was very primitive; it still had hind flippers, and its front flippers had webbed toes. Judging from the build of its tail, Protocetus had developed a tail fin. The jaws were long and lined with deadly teeth. Unlike its more primitive predecessor Pakicetus, Protocetus was able to hear properly under water.