If H. ergaster is included in H. erectus, then an occipital fragment from Koobi Fora (KNM-ER 2598) would push back the first appearance date to c.1.9 Ma, which would be consistent with the age of the H. erectus-like hominins recovered at Dmanisi.
If the most recently published maximum ages ( c.1.4 Ma) for Modjokerto/Perning35 and Sangiran36 are confirmed, and an age of c.150 ka,37 or even c.120 ka,38 for the hominins recovered from Ngandong is accepted, then the temporal range of H. erectus sensu stricto in Java would be from c.1.42 Ma to c.120 ka. If H. ergaster is included in H. erectus, then an occipital fragment from Koobi Fora (KNM-ER 2598) would push back the first appearance date to c.1.9 Ma, which would be consistent with the age of the H. erectus-like hominins recovered at Dmanisi.