Image: Homo ergaster lower jaw cast
Cast of fossil KNM-ER 992 found in Koobi Fora, East Turkana, Kenya in 1971 by Bernard Ngeneo. This lower jaw is the ‘type specimen’ or official representative of the species. It was first classified as Homo habilis, but was reclassified as Homo ergaster in 1975 because it showed advanced features such as a lightly built jaw and relatively small premolar and molar teeth.
- Carl Bento
- © Australian Museum