Final answer:
The raised area in the middle of the cranium found in Homo erectus is known as a sagittal keel.
Step-by-step explanation:
The presence of a raised area in the middle of the cranium found in Homo erectus is known as a saggital keel. The sagittal keel is a small raised ridge on top of the skull. This feature differentiates Homo erectus from other species such as Homo ergaster and is indicative of its distinct skull morphology, which includes a projecting nasal spine, thick skull bones, and pronounced brow ridges.