The American lion (Panthera leo atrox or P. atrox) — also known as the North American lion, Naegele’s giant jaguar or American cave lion — is an extinct lion of the family Felidae, endemic to North America and northwestern South America during the Pleistocene epoch (0.34 mya to 11,000 years ago), existing for approximately 0.33 million years. It has been shown by genetic analysis to be a sister lineage to the Eurasian cave lion (Panthera leo spelaea or P. spelaea).@Wikipedia.org
6W. Panthera (Leo) spelaea, the cave lion, is the one in the middle; males did not have manes. (If you want to make your head hurt, dive into the discussion boards about relative sizes of various felines, past and present.) -- In "Clan...." we meet the cave lion early on and his presence is felt throughout, as he comes to symbolize Ayla in the way the cave bear does for the clan.
Panthera leo spelaea (cave lion) - recent genetic research shows that it was most closely related to the modern lion and that it formed a single population with the Beringian cave lion. It ranged from Europe to Alaska over the Bering land bridge until the late Pleistocene.