The morphology of the enamel-dentine junction in Neanderthal molars: Gross morphology, non-metric traits, and temporal trends.
This study explores the morphological differences between the enamel-dentine junction (EDJ) of maxillary and mandibular molars of Neanderthals (n = 150) and recent modern humans (n = 106), and between an earlier Neanderthal sample (consisting of Pre-Eemian and Eemian Neanderthals dating to before 115 ka) and a later Neanderthal sample (consisting of Post-Eemian Neanderthals dating to after 115 ka). The EDJ was visualised by segmenting microtomographic scans of each molar. A geometric morphometric methodology compared the positioning of the dentine horns, the shape of the marginal ridge between the dentine horns, and the shape of the cervix. We also examined the manifestation of non-metric traits at the EDJ including the crista obliqua, cusp 5, and post-paracone tubercle. Furthermore, we report on additional morphological features including centrally placed dentine horn tips and twinned dentine horns. Our results indicate that EDJ morphology can discriminate with a high degree of reliability between Neanderthals and recent modern humans at every molar position, and discriminate between the earlier and the later Neanderthal samples at every molar position, except for the M3in shape space. The cervix in isolation can also discriminate between Neanderthals and recent modern humans, except at the M3in form space, and is effective at discriminating between the earlier and the later Neanderthal samples, except at the M2/M2in form space. In addition to demonstrating the taxonomic valence of the EDJ, our analysis reveals unique manifestations of dental traits in Neanderthals and expanded levels of trait variation that have implications for trait definitions and scoring.
Department of Anthropology, University of Toronto, 19 Russell Street, Toronto M5S 2S2, Canada.
Robert M G
RMG
Martin
Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
Jean-Jacques
JJ
Hublin
Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
Philipp
P
Gunz
Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany; School of Anthropology and Conservation, University of Kent, Canterbury CT2 7NZ, United Kingdom. Electronic address: m.skinner@kent.ac.uk.
Matthew M
MM
Skinner
D000818:Animals; D003743:Dental Enamel / Q000033:anatomy & histology*; D003804:Dentin / Q000033:anatomy & histology*; D005580:Fossils; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008334:Mandible / Q000033:anatomy & histology*; D008437:Maxilla / Q000033:anatomy & histology*; D008963:Molar / Q000033:anatomy & histology*; D059125:Neanderthals / Q000033:anatomy & histology*
Dental morphology; EDJ; MicroCT; Molars; Neanderthal; Non-metric dental traits