Dental Function and Diet of Vintana Sertichi (Mammalia, Gondwanatheria) from the Late Cretaceous of Madagascar
Dental Function and Diet of Vintana Sertichi (Mammalia, Gondwanatheria) from the Late Cretaceous of Madagascar
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马达加斯加晚白垩世 Vintana Sertichi（哺乳动物、冈瓦纳动物）的牙齿功能和饮食
DOI：
10.1080/02724634.2014.965778
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发表时间：
2014
影响因子：
1.4
通讯作者：
E. R. Dumont
中科院分区：
文献类型：
--
作者：
Schultz J. A;D. W. Kause;W. v. Koenigswald;E. R. Dumont
几乎完整且保存完好的Vintana sertichi头骨为研究其饮食适应提供了机会。我们使用了相结合的比较形态学和生物力学分析，以揭示其在咀嚼过程中的动力冲程的方向，重建其咀嚼肌的位置和相对大小，并预测其能力，产生咬合力在切口和磨牙咬合。上臼齿状牙齿ofVintana的牙齿磨损条纹的方向，结合方向的釉质岛和向斜和位置的领先和落后的边缘，表明电力中风主要是palinal（远端方向），与一个显着的buccally定向组件，是不存在的multituberculates，haramiyidans，和其他冈瓦纳兽。下颌运动的大软腭组件被证实的生物力学分析所产生的力矩的主要下颌内收肌周围的牙鳞关节轴。类似的分析也证实了先前记录的proal（近中定向）电力中风的现存啮齿动物Myocastor。有限元分析预测Vintana能够产生的咬合力是同样大小的Myocostoris的两倍多。Vintana几乎可以肯定是一种食草动物，就像以前对其他南方古猿冈瓦纳兽所宣称的那样。它的大小和在门齿和臼齿上产生高咬合力的能力表明它是一种混合食物，其饮食可能包括相对较大的坚硬食物，如根，种子，树枝或坚果状水果。
The nearly complete and well-preserved cranium ofVintana sertichiprovides an opportunity to investigate its dietary adaptations. We used a combination of comparative morphological and biomechanical analyses to reveal the direction of its power stroke during mastication, reconstruct the positions and relative sizes of its muscles of mastication, and predict its capacity to produce bite forces during incision and molariform occlusion. The orientation of dental wear striations on the upper molariform teeth ofVintana, in combination with the orientation of the enamel islets and synclines and the position of leading and trailing edges, demonstrates that the power stroke was primarily palinal (distally directed), with a significant buccally directed component that is absent in multituberculates, haramiyidans, and other gondwanatherians. The large palinal component of jaw movement was corroborated by biomechanical analyses of the moments generated by the primary jaw adductors around the dentary-squamosal joint axis. Similar analyses also confirmed the previously documented proal (mesially directed) power stroke of the extant rodentMyocastor. Finite element analyses predict thatVintanawas capable of producing bite forces that were more than twice as high as the similarly sizedMyocastor.Vintanawas almost certainly an herbivore, as claimed previously for other sudamericid gondwanatherians. Its size and capacity to generate high bite forces at both the incisors and the molariform teeth suggest that it was a mixed feeder whose diet may have included relatively large, hard food items such as roots, seeds, twigs, or nut-like fruits.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
影响因子：
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作者：
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