Pagkakaiba sa mga pagbabagong ng "Homo ergaster"

Itinuturing ng ilang mga paleoantroplogo ang ''H. ergaster'' na simpleng uring Aprikano ng ''H.[[Homo erectus]]''. Ito ay humahantong sa paggamit ng terminong "''Homo erectus [[sensu stricto]]''" para sa Asyanong ''H.Homo erectus'', at "''Homo erectus [[sensu lato]]''" para sa mas malaking species na bumubuo ng parehong maagang mga populasyong Aprikano (''H.Homo ergaster'') at mga populasyong Asyano.<ref>Antón, S. C. (2003), Natural history of Homo erectus. Am. J. Phys. Anthropol., 122: 126–170. {{doi|10.1002/ajpa.10399}} "By the 1980s, the growing numbers of H. erectus specimens, particularly in Africa, led to the realization that Asian H. erectus (H. erectus sensu stricto), once thought so primitive, was in fact more derived than its African counterparts. These morphological differences were interpreted by some as evidence that more than one species might be included in H. erectus sensu lato (e.g., Stringer, 1984; Andrews, 1984; Tattersall, 1986; Wood, 1984, 1991a, b; Schwartz and Tattersall, 2000)." ... "Unlike the European lineage, in my opinion, the taxonomic issues surrounding Asian vs. African H. erectus are more intractable. The issue was most pointedly addressed with the naming of H. ergaster on the basis of the type mandible KNM-ER 992, but also including the partial skeleton and isolated teeth of KNM-ER 803 among other Koobi Fora remains (Groves and Mazak, 1975). Recently, this specific name was applied to most early African and Georgian H. erectus in recognition of the less-derived nature of these remains vis à vis conditions in Asian H. erectus (see Wood, 1991a, p. 268; Gabunia et al., 2000a). It should be noted, however, that at least portions of the paratype of H. ergaster (e.g., KNM-ER 1805) are not included in most current conceptions of that taxon. The H. ergaster question remains famously unresolved (e.g., Stringer, 1984; Tattersall, 1986; Wood, 1991a, 1994; Rightmire, 1998b; Gabunia et al., 2000a; Schwartz and Tattersall, 2000), in no small part because the original diagnosis provided no comparison with the Asian fossil record."</ref><ref>Suwa, Gen, Yohannes Haile-Selassie, Tim White, Shigehiro Katoh, Giday Woldegabriel, William K. Hart, Hideo Nakaya, Yonas Beyene. 2007. ''Early Pleistocene Homo erectus fossils from Konso, southern Ethiopia.''
Anthropological Science Vol. 115 No. 2 p 133-151 {{doi|10.1537/ase.061203}} joi:JST.JSTAGE/ase/061203</ref> Iminungkahi ng ilang siyentipiko na ang Homo ergaster ang direktang ninunong Aprikano ng Homo erectus na nagmumungkahing ang Homo ergaster ay lumisan sa Aprika at lumipat sa Asya na nagsanga sa isang natatanging species.<ref>{{cite book|last=Tattersall|first=Ian and Jeffrey Schwartz|title=Extinct Humans|year=2001|isbn=0-8133-3482-9|place=Boulder, Colorado|publisher= Westview/Perseus}}</ref>