| Ontocetus Temporal range: Miocene to Late Pleistocene,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Carnivora |
| Clade: | Pinnipedia |
| Family: | Odobenidae |
| Subfamily: | Odobeninae Leidy, 1859 |
| Genus: | †Ontocetus Leidy, 1859 |
| Type species | |
| O. emmonsi | |
| Species | |
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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 13.3 million years.[1]