The 84th Annual Meeting of the American Association of Physical Anthropologists (2015)


Dikika cercopithecids and paleoenvironment

CHALACHEW M. SEYOUM1,2,3 and ZERESENAY ALEMSEGED4.

1Institute of Human Origins, Arizona State University, 2School of Human Evolution and Social Changes, Arizona State University, 3Research Directorate, ARCCH, 4Anthropology, California Academy of Sciences

March 26, 2015 , Archview Ballroom Add to calendar

ABSTRACT- Fossil cercopithecids from the Dikika research area have been examined in this study to explore their taxonomic status and investigate their paleoenvironmental context. The specimens are derived from the radiometrically well dated (3.4 2 – 3.26 Ma) Sidi Hakoma Member of the Hadar Formation. Their taxonomic attribution was done based on comparative studies with other living and fossil Cercopithecidae. For this purpose both qualitative and quantitative approaches were employed. Result of these analyses show that all Dikika specimens examined here belong to Theropithecus oswaldi darti. Furthermore, faunal abundance and sedimentological data combined with previously documented environmental evidence indicate that T. o. darti at Dikika lived in an open environment (habitat) within the paleoenvironmental mosaic.

The authors are thankful for the Lakeside Foundation and the California Academy of Sciences, Paleontological Scientific Trust (PAST), Addis Ababa University and ARCCH.