Ferguson (1989) establishes Australopithecus walkeri as a new species with specimen KNM-WT 17000 as the holotype. Ferguson (1989) argues that the holotype is not to be included in the same hypodigm as Omo-18-1967-18, the type specimen of Paraustralopithecus aethiopicus Arambourg and Coppens, 1968.
