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Wednesday, March 25, 2015

The stapes of a neanderthal child points to the anatomical differences with respect to our species even in the smallest bones

  • New remains recovered in an excavation carried out over 40 years ago have enabled this auditory ossicle to be reconstructed
  • Asier Gómez-Olivencia, an Ikerbasque researcher at the UPV/EHU-University of the Basque Country, has published in The Journal of Human Evolution a piece of research in which he stresses the importance of reviewing old excavations

Asier Gómez-Olivencia, an Ikerbasque researcher at the UPV/EHU, has led a piece of research that has produced a 3D reconstruction of the remains of a two-year-old Neanderthal recovered from an excavation carried out back in the 1970s at La Ferrassie (Dordogne, France). The work reveals the existence of anatomical differences between the Neanderthals and our species, even in the smallest ossicles of the human body.

The Neanderthals (Homo neanderthalensis) inhabited Europe and parts of western Asia between 230,000 and 28,000 years ago; during the last few millennia they coincided with Homo Sapiens Sapiens, and became extinct for reasons that are still being challenged. The archaeological site at La Ferrassie, excavated throughout the 20th century, is a mythical enclave because it was where 7 Neanderthal skeletons, ranging from foetuses to almost complete skeletons of adults, were found.

Among the remains discovered at La Ferrassie is the skeleton of a 2-year-old Neanderthal child found between 1970 and 1973 and baptised La Ferrassie 8; over 40 years since its discovery it has turned out to be useful in shedding new light on the anatomy of this extinct species.

The study began by reviewing the collections at the Muséum National d'Histoire Naturelle in Paris and at the Museo d'Archéologie national de St. Germain-en-Laye linked to the excavations at La Ferrassie in 1970 and 1973; it was there that 47 new fossils belonging to La Ferrassie 8, which complete its skeleton further, were recovered. Remains of a skull, jaw, vertebrae, ribs and hand phalanges were found among the new fossils.

Featuring among the remains is a very complete left temporal bone and an auditory ossicle was found inside it: a complete stapes. Virtual 3D reconstruction techniques enabled this ossicle to be "extracted virtually" and studied.

This stapes is the most complete one in the Neanderthal record and certifies that there are morphological differences between our species and the Neanderthals even in the smallest ossicles in the human body. As Asier Gómez-Olivencia pointed out, "we do not yet know the relation between these morphological differences and hearing in the Neanderthals. This would constitute a new challenge for the future".

The study of these new remains has been published in the prestigious Journal of Human Evolution, and has also had the participation of researchers of the CNRS (French National Centre for Scientific Research) in Paris and Bordeaux.  The fact that a discovery of such significance has been made thanks to reviewing the remains excavated in the 1970s provides the researcher with proof of "the importance and need to review old excavations. We're in no doubt about that".

Asier Gómez-Olivencia, a doctor in Human Palaeontology, did research at the University of Cambridge and at the Muséum National d'Histoire Naturelle in France, until 2014 when he joined the UPV/EHU's Department of Stratigraphy and Palaeontology as an Ikerbasque Research Fellow.

 

Bibliographic reference:

http://www.sciencedirect.com/science/article/pii/S0047248415000275

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