The size of the Ileret footprints is consistent with stature and body mass estimates for Homo ergaster / erectus, and these prints are also morphologically distinct from the 3.75 - million - year - old footprints at Laetoli, Tanzania. (science.sciencemag.org)
Until the discovery of the first jawbone at Dmanisi 25 years ago, researchers thought that the first hominins to leave Africa were classic H. erectus (also known as H. ergaster in Africa). (sciencemag.org)
Each individual researcher that sees ergaster as a valid taxon sees different specimens as belonging or not belonging to the taxon. (archaeologyinfo.com)