Pliocene pinnipeds

species of mammal

Valenictus is an extinct genus of Odobenidae from the Pliocene of California.

Ontocetus is an extinct genus of walrus, an aquatic carnivoran of the family Odobenidae, endemic to coastal regions of the southern North Sea and the southeastern coastal regions of the U.S. during the Miocene-Pleistocene. It lived from 13.6 mya—300,000 years ago, existing for approximately .

Pliophoca is an extinct genus of seal in the family Phocidae.

Platyphoca is an extinct genus of earless seals from Neogene marine deposits in the North Sea basin.