| Euarctos J. E. Gray, 1864 |
| Euarctos americanus (Pallas, 1780) |
| Euarctos americanus subsp. machetes Elliot, 1903 |
| Ursidae Fischer von Waldheim, 1817 |
| Ursus Linnaeus, 1758 |
| Ursus americanus Pallas, 1780 |
| Ursus americanus subsp. eremicus Merriam, 1904 |
| Ursus americanus subsp. machetes Elliot, 1903 |
| Ursus arctos Linnaeus, 1758 |
| Ursus arctos subsp. horribilis Ord, 1815 |
| Ursus arctos subsp. nelsoni R. H. Baker & Greer, 1962 |
| Ursus horribilis Ord, 1815 |
| Ursus kennerleyi Merriam, 1914 |
| Ursus lotor Linnaeus, 1758 |
| Ursus machetes Elliot, 1903 |
| Ursus nelsoni Merriam, 1914 |
| Ursus taxus Schreber, 1778 |