Homo erectus was the direct antecedent to our species, Homo sapiens. He came in several forms, and I would include here the taxon Homo ergaster, as well as Homo rudolphensis. He was a world traveler, originating in Africa and spreading to western Asia, eastern Asia, and southeast Asia. The type specimen was found on the Indonesian island of Java, and later specimens were found at Zhoukoudian Cave, near Beijing ("Peking Man"), as well as the famous "Turkana Boy" of Kenya. Another site in modern day Georgia, near Dmanisi, yielded a whole community of early H. erectus, known as Homo ergaster. Homo erectus dates from nearly 2 million years ago to 400,000 years ago. He was more advanced than Homo habilis, with a larger cranial capacity (increased encephalization), was taller and more gracile, and was adept at making stone tools. The lithic, or stone tool technology, of Homo erectus was Acheulian.
Turkana Boy, discovered in Kenya, was the most complete Homo erectus discovered yet to date. Postcranially, Turkana Boy was extremely revealing. He was very much like Homo sapiens, with longer arms. Cranially, his cranial capacity was 900 cc, about half of our capacity.
The surprising thing is, that at 5'3", Turkana Boy was not 14 or 15 years old. It is now thought that Turkana Boy was a mere 9-12 years old, which is a very apelike growth pattern.