1. Department of Paleobiology; Paleoanthropology Group, Museo Nacional de Ciencias Naturales (CSIC); Madrid 28006 Spain
2. Sections Paleoanthropology and Tertiary Mammals; Senckenberg Gesellschaft für Naturforschung; Senckenberganlage 25 Frankfurt am Main 60325 Germany
3. Department of Stomatology; Section of Orthodontics, Faculty of Odontology, University of Granada; Granada 18071 Spain