Original: He first described the species as Pithecanthropus erectus ("upright ape-man"), based on a calotte (skullcap) and a modern-looking femur found from the bank of the Solo River at Trinil, in East Java.
Simplified: Dutch anatomist Eugene Dubois (1890s) first described it as Pithecanthropus erectus, based on a skullcap and a modern-looking thighbone found from the bank of the Solo River at Trinil, in Java.