RT Journal Article T1 A complete human pelvis from the middle pleistocene of Spain A1 Arsuaga Ferreras, Juan Luis A1 Lorenzo, C. A1 Carretero, J. M. A1 Gracia, A. A1 Martínez Mendizábal, Ignacio A1 García, N. A1 Bermúdez de Castro, J. M. A1 Carbonell, E. AB The Middle Pleistocene site of Sima de los Huesos in Sierra de Atapuerca, Spain, has yielded around 2,500 fossils from at least 33different hominid individuals1. These have been dated at more than 200,000 years ago2,3,4 and have been classified as ancestors of Neanderthals. An almost complete human male pelvis (labelled Pelvis 1) has been found, which we associate with two fragmentary femora. Pelvis 1 is robust and very broad with a very long superior pubic ramus, marked iliac flare, and a long femoral neck. This pattern is probably the primitive condition from which modern humans departed. A modern human newborn would pass through the birth canal of Pelvis 1 and this would be even larger in a female individual. We estimate the body mass of this individual at 95 kg or more. Using the cranial capacities of three specimens from Sima de los Huesos, the encephalization quotients are substantially smaller than in Neanderthals and modern humans. PB Macmillan SN 0028-0836 YR 1999 FD 1999-05-20 LK https://hdl.handle.net/20.500.14352/110512 UL https://hdl.handle.net/20.500.14352/110512 LA eng NO Arsuaga, JL., Lorenzo, C., Carretero, JM. et al. A complete human pelvis from the Middle Pleistocene of Spain. Nature 399, 255–258 (1999). https://doi.org/10.1038/20430 NO Junta de Castilla y León NO Dirección General de Enseñanza Superior (España) NO Comunidad de Madrid DS Docta Complutense RD 8 abr 2025