KNM ER 3733
|Catalog number||KNM ER 3733|
|Place discovered||Koobi Fora, Kenya|
|Discovered by||Bernard Ngeneo|
KNM ER 3733* is a fossilized hominid cranium of the extinct hominid Homo ergaster, which is interchangeably referred to as Homo erectus It was discovered in Koobi Fora, Kenya, right next to Lake Turkana, by Bernard Ngeneo, a field worker for Richard Leakey, in 1975. Its geographic location is not to be confused with that of KNM WT 15000*, Turkana Boy, also known as Nariokotome Boy, who was also found near Lake Turkana, nine years later, in 1984.
*KNM ER refers to: Kenya National Museum, East Rudolf, which is the location of the discovery.
*KNM WT refers to: Kenya National Museum, West Turkana, which is the location of the discovery.
KNM ER 3733 is one of the oldest Homo ergaster skulls in the world. In a 1989 publication in the American Journal of Physical Anthropology, Dr. Craig Feibel, now at Rutgers University Geology Department, and his co-workers, estimated the age of KNM-ER 3733 at around 1.8 million years old. However, more recent research using magnetostratigraphy has determined the age of KNM-ER 3733 to be about 1.7 million years old.
KNM ER 3733 is a find of a near-complete cranium. Its brain size is about 850cc. KNM ER 3733 was compared to male fossils KNM ER 3833 and KNM WT 15000 (Turkana Boy), who were also found at the Koobi Fora site, and because of this, is said to be female. The features of KNM ER 3733 are less robust compared to the two male crania. It is considered an adult because of the extensive wear of its teeth, the fact that its third molars were present before the individual died, and because its cranial sutures were fully fused, which is only possible in adult specimen.
- "Images of KNM ER 3733". Retrieved 2006-07-14.
- Lepre, C. J.; Kent, D. V. (2010). "New magnetostratigraphy for the Olduvai Subchron in the Koobi Fora Formation, northwest Kenya, with implications for early Homo". Earth and Planetary Science Letters 290 (3–4): 362. Bibcode:2010E&PSL.290..362L. doi:10.1016/j.epsl.2009.12.032.
- “Knm-er.” Academic Press Dictionary of Science and Technology. Oxford: Elsevier Science & Technology, 1992. Credo Reference. Web. 30 April 2014.