What are the physical and cultural characteristics of Homo erectus? Discuss its phylogenetic status

Physical characters

• Brain size commonly 750–1100 cc, well above australopiths, below later sapiens. The vault is low, with a supraorbital torus, nuchal torus, and sagittal keeling in many Asian fossils.
• The face is prognathic but less so than habilines. Teeth are smaller than australopiths. The mandible lacks a chin.
• Postcrania, from Nariokotome (KNM-WT 15000) and related finds, show long legs, narrow pelvis, and endurance-walking build. Sexual dimorphism is reduced relative to robust australopiths.
• African fossils often labelled Homo ergaster are thinner-boned. Java (Trinil, Sangiran) and Zhoukoudian show the classic thick Asian pattern. Dmanisi is smaller-brained and variable.

Cultural characters

• Acheulian handaxes and cleavers dominate African and western Eurasian sites. East Asia often shows Mode 1 cores and flakes, the old Movius line debate.
• Controlled use of fire is argued at some caves; hearths are clearer later. Systematic hunting and scavenging of large mammals appear with the long-legged body.
• Out-of-Africa range by about 1.8 million years, from Africa to Java and the Caucasus, is itself a cultural-ecological fact: tools, meat, and social care of a slow-growing child.

Phylogenetic status

• Erectus is widely treated as a chronospecies on the line toward later Homo, ancestral to Heidelbergensis and then sapiens and Neanderthals in many textbooks.
• Splitters keep ergaster, erectus sensu stricto, antecessor, and Dmanisi as separate. Lumpers keep one polytypic erectus.
• It is not a failed side-branch like robust australopiths. It is the first cosmopolitan Homo. Whether every Asian erectus left descendants is open.