First publication in English by Alekseyev of Homo rudolfensis, primarily known from KNM-ER 1470, discovered in Koobi Fora in the Lake Turkana basin, Kenya. Alekseyev (Alexeev) first proposed the species in 1978, initially naming it Australopithecus rudolfensis. At first the skull was incorrectly dated at nearly three million years old, predating Homo habilis. Since then, the estimate has been revised to 1.9 million years before present.