Plesiadapis

Plesiadapis was a genus of extinct mammals that lived during the Paleocene Epoch, between 66 and 56 million years ago. These early primates, though not directly ancestral to modern primates, shared some characteristics with them, particularly in their dental anatomy. They are considered to be among the earliest and most primitive primates to appear in the fossil record.12

Plesiadapis fossils have been found in North America and Europe. These animals inhabited forested environments and were likely diurnal, meaning they were active during the day. They were part of a diverse mammalian fauna that evolved rapidly after the extinction of the dinosaurs.12