The lion lineage is thought to have originated in Africa, with fossils of the lineage of the continent extending back to the Late Pliocene, with the ancestors of Panthera fossilis migrating out of Africa during the Early-Middle Pleistocene transition around 1-0.8 million years ago.
Recent nuclear genomic evidence suggest that interbreeding between modern lions and all Eurasian fossil lions took place up until 500,000 years ago, but by 470,000 years ago, no subsequent interbreeding between the two lineages occurred.
In comparison to the modern lion, in addition to being larger, the upper second premolar of P. fossilis is larger, and the cusp morphology of the upper fourth premolar is different (having a shorter metastyle).
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