What is pithicus?

As an AI language model, I could not find any reliable information about "pithicus". It is possible that you meant "pithecus," which is another term for the extinct primate genus Australopithecus, which includes the famous early human ancestor species known as "Lucy." Australopithecus lived in parts of Africa millions of years ago and had a mixture of human and ape-like characteristics. They walked upright on two feet and had relatively small brains. However, they had other features such as long arms and curved fingers that suggest they were adapted to climbing trees as well.