在Oviraptorosauria的形态演变之前,对强度的头骨功能专业化先于形态演变
Luke E Meade1, Michael Pittman2, Amy Balanoff3
1School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK. luke.edward.meade@gmail.com.
Communications biology
|April 10, 2024
概括
包括oviraptorids在内的Oviraptorosaurian恐龙头骨令人惊地强大,与大型食肉类类热足动物相比. 这种增强的头骨强度起源于Oviraptorosauria群的早期,甚至在专门的部发育之前.
科学领域:
- 古生物学的古生物学
- 生物力学 生物力学
- 进化生物学 进化生物学
背景情况:
- 卵性龙类动物,特别是卵性龙类动物,拥有独特的,气动化的,没有牙的嘴巴,适应了草食动物和万食动物的饮食.
- 以前的解释表明,这些嘴巴提供了强大的咬伤,但它们的机械阻力尚未完全理解.
研究的目的:
- 为了研究与其他热足动物相比,Oviraptorid头骨的机械应力耐受性.
- 为了确定在Oviraptorosauria中增强的头骨生物力学的进化起源.
主要方法:
- 为Incisivosaurus gauthieri,Citipati osmolskae,Conchoraptor gracilis和Khaan mckennai进行数字3D模型的构建.
- 有限元素分析 (FEA) 用于评估头骨强度.
- 咬伤模型使用估计的肌肉力量.
主要成果:
- 其他食草动物 (Erlikosaurus,Ornithomimus) 的头骨比其他食草动物 (Oviraptorosaurus) 的头骨更强大,并且与Allosaurus相似.
- 印西沃萨鲁斯的头骨生物力学与卵类动物一致,这表明在卵类动物中早期的强化.
- 卵性龙的头骨在结构安全极限附近运行,而低的应力表明了兰氏体的专门食功能.
结论:
- 在Oviraptorosauria早期建立了增强的头骨生物力学,早于专门的oviraptorid头骨形态学.
- 卵类动物的形体很可能是作为一种独特的食工具,而不仅仅是为了减轻压力.
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