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What does the face of Olduvai Hominid 24 reveal about Homo habilis and Australopithecus similarities?

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An illustration of Homo habilis, an early human ancestor, shown walking upright with a hairy body and ape-like features. A scale beside the figure indicates height in inches and centimeters. — Homo habilis Artist's rendering of *Homo habilis*, which lived from 2 to 1.5 million years ago.

The fossil specimen known as Olduvai Hominid 24 (OH 24) provides significant insight into the anatomical transition between early Homo and its predecessors. While OH 24 exhibits differences from Australopithecus regarding brain size and dental characteristics, its facial structure reveals notable similarities to the australopiths of southern Africa.1

Specifically, the face of OH 24 features prominent cheekbones and a flat nasal region. This configuration creates a depressed or "dished" appearance in the central part of the face, where the upper portion of the nasal profile is obscured by the cheek when viewed from the side. This hollowed facial structure is characteristic of certain South African australopiths but is not observed in later species of Homo. Consequently, OH 24 serves as an important example of how early Homo habilis retained specific anatomical traits associated with Australopithecus even as other features of the genus began to evolve toward a more modern human form.21