Plionarctos is an extinct genus of bear endemic to North America from the Miocene to the Pliocene,[2] ~10.3—3.3 Mya, existing for about 7 million years.
Indarctos (10.7—9.2 Mya) preceded Plionarctos by only a few thousand years and was a contemporary of that bear and shared its habitat. Plionarctos preceded and was also contemporary with Tremarctos floridanus (4.9 million — 11,000 years ago) and shared its habitat. Plionarctos is the oldest known genus within the subfamily of the short-faced bears (Tremarctinae), and is believed to be ancestral to the clade.
^Frick, Childs (1926). "The Hemicyoninæ and an American Tertiary Bear". Bulletin of the American Museum of Natural History. 56 (1): 111–119. hdl:2246/1321.
^ abTedford, Richard H.; Martin, James (2001). "Plionarctos, a tremarctine bear (Ursidae: Carnivora) from western North America". Journal of Vertebrate Paleontology. 21 (2): 311–321. doi:10.1671/0272-4634(2001)021[0311:PATBUC]2.0.CO;2. JSTOR 20061955. S2CID 130061851.
7—9.2 Mya) preceded Plionarctos by only a few thousand years and was a contemporary of that bear and shared its habitat. Plionarctos preceded and was also...
with their common ancestor, Plionarctos, in the Middle Hemphillian (earliest Late Miocene, ~10Ma) of North America; Plionarctos is last recorded in the early...
formation of the Isthmus of Panama. Their earliest fossil representative is Plionarctos in North America (c. 10–2 Ma). This genus is probably the direct ancestor...
with their common ancestor, Plionarctos, in the Middle Hemphillian (earliest Late Miocene, ~10 Ma) of North America; Plionarctos is last recorded in the early...
5–0.010 Mya) A. vetustum (0.7–0.3 Mya) A. wingei (0.1–0.012 Mya) Genus Plionarctos† (10.3–1.8 Mya) P. edensis (10.3–4.9 Mya) P. harroldorum (4.9–1.8 Mya)...
from Kazakhstan. In North America this animal was contemporary with Plionarctos (~10.3—3.3 Ma). A molar (designated to MNA 1839/km-83) discovered from...
in the form of Plionarctos. The medium-sized Arctodus pristinus, Tremarctos floridanus and Arctotherium sp. evolved from Plionarctos in the Blancan age...
Tremarctinae (short-faced bears) Genus Arctodus Genus Arctotherium Genus Plionarctos Genus Tremarctos Florida cave bear (Tremarctos floridanus) Subfamily...
ancient climate of Gray was much warmer than modern wolverine habitats. Plionarctos (short-faced bear). Saber-toothed cat, possibly Machairodus. Buisnictis...
Global Information