Masticatory jaw movement of Exaeretodon argentinus (Therapsida: Cynodontia) inferred from its dental microwear.
Masticatory jaw movement of Exaeretodon argentinus (Therapsida: Cynodontia) inferred from its dental microwear.
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DOI：
10.1371/journal.pone.0188023
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Kubo MO
中科院分区：
文献类型：
--
作者：
Kubo T;Yamada E;Kubo MO
采用二维和三维方法对4颗阿根廷Exaeretodon argentinus后犬齿的微磨损进行了分析，以推断其咀嚼运动。两种方法的结果是一致的，表明线性微磨损特征（划痕）对齐良好，主要是针对前后方向在所有四个牙齿检查。这些研究结果支持了以往研究中基于磨损面的总体形态观察推断的腭侧咀嚼下颌运动。相比之下，没有检测到横向划痕证实了没有横向颌运动，这也是由以前的研究提出的。考虑到以前的微磨损的研究犬齿，在Exaeretodon中观察到的回文下颌运动内cynognathian犬齿从完全正交的下颌运动的基础成员。虽然目前只有三个研究牙齿微磨损的非哺乳动物的犬齿象，包括本研究，微磨损分析是一个有用的工具，用于重建咀嚼颌骨运动和其未来的应用程序，以各种犬齿象将阐明更详细的哺乳动物条件下的颌骨运动的进化过程。
Dental microwear of four postcanine teeth of Exaeretodon argentinus was analyzed using both two dimensional (2D) and three dimensional (3D) methods to infer their masticatory jaw movements. Results of both methods were congruent, showing that linear microwear features (scratches) were well aligned and mostly directed to the antero-posterior direction in all four teeth examined. These findings support the palinal masticatory jaw movement, which was inferred in previous studies based on the observation of gross morphology of wear facets. In contrast, the lack of detection of lateral scratches confirmed the absence of the lateral jaw movement that was also proposed by a previous study. Considering previous microwear studies on cynodonts, palinal jaw movements observed in Exaeretodon evolved within cynognathian cynodonts from the fully orthal jaw movement of its basal member. Although there are currently only three studies of dental microwear of non-mammalian cynodonts including the present study, microwear analysis is a useful tool for the reconstruction of masticatory jaw movement and its future application to various cynodonts will shed light on the evolutionary process of jaw movement towards the mammalian condition in more detail.
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