کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4557284 1329540 2008 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
What molars contribute to an emerging understanding of lateral enamel formation in Neandertals vs. modern humans
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
What molars contribute to an emerging understanding of lateral enamel formation in Neandertals vs. modern humans
چکیده انگلیسی

Two hypotheses, based on previous work on Neandertal anterior and premolar teeth, are investigated here: (1) that estimated molar lateral enamel formation times in Neandertals are likely to fall within the range of modern human population variation, and (2) that perikymata (lateral enamel growth increments) are distributed across cervical and occlusal halves of the crown differently in Neandertals than they are in modern humans. To investigate these hypotheses, total perikymata numbers and the distribution of perikymata across deciles of crown height were compared for Neandertal, northern European, and southern African upper molar mesiobuccal (mb) cusps, lower molar mesiobuccal cusps, and the lower first molar distobuccal (db) cusp. Sample sizes range from five (Neandertal M1db) to 29 (southern African M1mb). Neandertal mean perikymata numbers were found to differ significantly from those of both modern human samples (with the Neandertal mean higher) only for the M2mb. Regression analysis suggests that, with the exception of the M2mb, the hypothesis of equivalence between Neandertal and modern human lateral enamel formation time cannot be rejected. For the M2mb, regression analysis strongly suggests that this cusp took longer to form in the Neandertal sample than it did in the southern African sample. Plots of perikymata numbers across deciles of crown height demonstrate that Neandertal perikymata are distributed more evenly across the cervical and occlusal halves of molar crowns than they are in the modern human samples. These results are integrated into a discussion of Neandertal and modern human lateral enamel formation across the dentition, with reference to issues of life history and enamel growth processes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Human Evolution - Volume 54, Issue 2, February 2008, Pages 236–250
نویسندگان
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