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Plionarctos is the oldest known genus in Ursidae's subfamily Tremarctinae which contains short faced bears. It is believed to be ancestral to both the Arctodus and Tremarctos genus. Plionarctos evolved from the genus Ursavus (possibly Ursavus brevirhinus) and existed from 10.3 million to 3.3 million years ago, from the Mid-Miocene to the early Pliocene Epoch. The three known sub-species of Plionarctos are Plionarctos edensis, Plionarctos harroldorum, and Plionarctos telonensis. Plionarctos was assigned to the bear family Ursidae in 1926 by paleontologist Childs Frick and to the subfamily Tremarctinae by R. M. Hunt in 1998.  The map below shows where Plionarctos fossils have been discovered.

Partial Distribution Map of Plionarctos Fossils

| Home | Agriarctos | Agriotherium | Alaskan Grizzly | Allocyon loganensis | Argentine short-faced bear |

| American Black Bear | Asiatic Black Bear | Atlas Bear | Auvergne Bear | Baluchistan Black Bear |

| Brown Bear | Cinnamon Bear | California Black Bear | Dall Black Bear | Dawn Bear | Early Polar Bear |

| Etruscan bear | European Cave Bear | Florida Black Bear | Florida Cave Bear | Formosan Black Bear |

| Giant Panda Bear | Giant Short-Faced Bear | Grizzly Bear | Himalayan Black Bear | Indarctos arctoides |

| Japanese Black Bear | Kamchatka Brown Bear | Kermode Bear | Kodiak Bear | Kolponomos |

| Olympic Black Bear | Parictis | Plionarctos | Polar Bear | Primal Panda Bear | Protursus |

| Pygmy Giant Panda | Qinling Panda Bear | Siberian Brown Bear | Sloth Bear |

| Spectacled Bear | Sun Bear | Syrian Brown Bear | Tibetan Blue Bear |

| Ursus abstrusus | Bear Subspecies / Classification | Bear Links |

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