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The morphology of the enamel dentine junction in Neanderthal molars: Gross morphology, non-metric traits, and temporal trends
- Publication Year :
- 2017
-
Abstract
- 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 M3 in shape space. The cervix in isolation can also discriminate between Neanderthals and recent modern humans, except at the M3 in form space, and is effective at discriminating between the earlier and the later Neanderthal samples, except at the M2/M2 in 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.
- Subjects :
- Molar
010506 paleontology
Neanderthal
EDJ
Dental morphology
Non-metric dental traits
Morphology (biology)
Mandible
Molars
MicroCT
01 natural sciences
stomatognathic system
biology.animal
Image Processing, Computer-Assisted
Maxilla
Animals
Humans
0601 history and archaeology
Dental Enamel
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Neanderthals
060101 anthropology
biology
Enamel paint
Horn (anatomy)
Fossils
QH
06 humanities and the arts
Anatomy
Anthropology
visual_art
GN
Dentin
visual_art.visual_art_medium
Cusp (anatomy)
Non metric
Subjects
Details
- Language :
- English
- ISSN :
- 00472484
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....cefae1061f0e7cd10458599e5d3759cc