Notharctus was an early primate that inhabited Europe and North America 50 million years ago. Modern lemurs evolved from primates
similar to this genus. The body form of Notharctus is similar to that of modern lemurs. Unlike lemurs, however, Notharctus
had a shorter face and forward-facing eyes surrounded by an enclosed circle of bone. Its fingers were elongated for clamping
onto branches, including the development of a thumb.