The likely ancestors of tarsiers, monkeys, apes and humans are the:

The likely ancestors of tarsiers, monkeys, apes and humans are the omomyidae.

Omomyidae is a family of early primates that radiated during the Eocene epoch between about 55 to 34 million years ago. They had the following characteristics: large orbits (eye sockets), shortened rostra and dental arcades, loss of anterior premolars, cheek teeth adapted for insectivorous or frugivorous diets, and relatively small body mass.