Functional reorganisation of the cranial skeleton during the cynodont-mammaliaform transition.
Functional reorganisation of the cranial skeleton during the cynodont-mammaliaform transition.
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DOI：
10.1038/s42003-023-04742-0
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发表时间：
2023-04-12
影响因子：
5.9
通讯作者：
Rayfield, Emily J.
中科院分区：
文献类型：
--
作者：
Lautenschlager, Stephan;Fagan, Michael J.;Luo, Zhe-Xi;Bird, Charlotte M.;Gill, Pamela;Rayfield, Emily J.
在过去的5亿年里，骨骼简化发生在多个脊椎动物分支中，包括从哺乳动物前犬齿兽到哺乳动物的进化。这种转变的特征是颅骨的丢失和减少，新的颌骨关节的出现，以及颌骨肌肉组织的重新排列。长期以来，这些修改被假设为在进食期间增加头骨强度和效率。在这里，我们结合联合收割机数字重建和生物力学建模，以表明没有证据表明增加颅强度和生物力学性能。我们的分析表明，选择性功能重组的颅骨骨骼，导致减少应力的braincase和头骨的屋顶，但增加应力在颅区通过这一过渡。这种颅功能的重组，减少机械优势，并在身体大小的整体化与食虫的饮食专业化，允许随后的哺乳动物谱系的形态和生态多样化。与历史观点相反，在犬齿兽向哺乳动物过渡期间，颅骨强度并没有随着颅骨的重组和颌骨关节的简化而增加。
Skeletal simplification occurred in multiple vertebrate clades over the last 500 million years, including the evolution from premammalian cynodonts to mammals. This transition is characterised by the loss and reduction of cranial bones, the emergence of a novel jaw joint, and the rearrangement of the jaw musculature. These modifications have long been hypothesised to increase skull strength and efficiency during feeding. Here, we combine digital reconstruction and biomechanical modelling to show that there is no evidence for an increase in cranial strength and biomechanical performance. Our analyses demonstrate the selective functional reorganisation of the cranial skeleton, leading to reduced stresses in the braincase and the skull roof but increased stresses in the zygomatic region through this transition. This cranial functional reorganisation, reduction in mechanical advantage, and overall miniaturisation in body size are linked with a dietary specialisation to insectivory, permitting the subsequent morphological and ecological diversification of the mammalian lineage. Contrary to historical belief, skull strength during the cynodont–mammalian transition did not increase with the reorganisation of the cranial bones and simplified jaw joint.
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影响因子：
2.9
作者：
Goswami, Anjali
通讯作者：
Goswami, Anjali
DOI：
10.1002/ar.23473
发表时间：
2017-02-01
影响因子：
2
作者：
Jasinoski, Sandra C.;Abdala, Fernando
通讯作者：
Abdala, Fernando
影响因子：
3.3
作者：
DEMAR, R;BARGHUSEN, HR
通讯作者：
BARGHUSEN, HR
影响因子：
9.2
作者：
Close, Roger A.;Friedman, Matt;Benson, Roger B. J.
通讯作者：
Benson, Roger B. J.
影响因子：
4.3
作者：
Aboitiz, Francisco;Montiel, Juan F.
通讯作者：
Montiel, Juan F.