Hominid Cranium From Omo:
Description and Taxonomy of Omo-323-1976-896

Zeresenay Alemseged, Yves Coppens, and Denis Geraads

Omo-323-1976-896, a partial hominid cranium
dated to ca. 2.1 from the Member G, Unit G-8 of the
Shungura Formation, lower Omo Basin of Ethiopia, is described.
It is suggested that the specimen is an adult male
based on the well-developed and completely fused sagittal
crest; heavily worn teeth; relatively large canine; and size of
the articular eminence. Omo-323 consists of fragments of the
frontal, both temporals, occipital, parietals, and the rightmaxilla, and is attributed to Australopithecus boisei, making
it the oldest known cranium of this species. The specimen
shares features with Australopithecus aethiopicus (KNMWT
17000), thus supporting the existence of an evolving
East African robust lineage between ca. 2.6–1.2 Ma. The
morphology of Omo-323 increases our knowledge of the intraspecific
variability of A.boisei. Am J Phys Anthropol 117:
103–112, 2002.