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Homo ergaster: KNM-ER 3733

  • Geologic Age:

    1.75 Ma

  • Discovery Date:


  • Discovered By:

    Bernard Mgeneo

  • Discovery Location:

    Area 104, Koobi Fora, Kenya

  • Cranial Capacity:

    850 cc

  • Specimen Age:


  • Sex:


  • Original Publication:

    Leakey 1976

    KNM-ER 3733 is an almost complete cranium, but missing some lateral aspects of the orbits, the zygomatic bones, and the maxilla. Most of the maxillary pre-molars and molars are present, as well as several roots of missing teeth. With an estimated cranial capacity of 850 cc1, the cranium exhibits well-developed temporal lines, a forward-projecting (though thin) supraorbital torus with a pronounced supratoral sulcus, and moderate postorbital constriction2. In addition, the frontal is low and receding, the nasal aperture is relatively wide, just as the interorbital region is relatively broad2.

    1. Leakey REF. 1976. New hominid fossils from the Koobi Fora formation in Northern Kenya. Nature 261:574-576
    2. Klein RG. 2009. The Human Career: Human Biological and Cultural Origins, Third Edition. Chicago: University of Chicago Press.

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