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Tremarctinae po arthes enep berr yw isteylu a Ursidae gans unn ehen vew, an arth Andes (Tremarctos ornatus) a Amerika Dheghow, ha neb ehennow difeudhek yn peswar genera: an arth Florida (Tremarctos floridanus), an arthes enep berr a Amerika Gledh yn genera Plionarctos (P. edensis ha P. harroldorum) hag Arctodus (A. pristinus hag A. simus), hag an arthes enep berr kowr a Amerika Dheghow yn Arctotherium (A. latidens, A. brasilense, A. angustidens, A. vetustum, A. bonariense, A. tarijense, hag A. wingei).
| Tremarctinae Efander menhesennow: Miocene diwedhes dhe Oos a-dhiwedhes | |
|---|---|
 | |
| Arth Andes yn milva Tennōji, Osaka, Nihon. | |
| Klassans bewoniethek | |
| Gwlaskor: | |
| Fylum: | |
| Klass: | |
| Infraklass: | Eutheria |
| Ugh-urdh: | Laurasiatheria |
| Urdh: | |
| Is-urdh: | Caniformia |
| Teylu: | |
| Isteylu: | Tremarctinae |
| Genera | |
P. R. Bjork a ros Tremarctinae dhe'n teylu Ursidae yn 1970 hag unn a tri isteylu aswonys yn Ursidae yw.
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